CA1186167A - Air sampling device - Google Patents
Air sampling deviceInfo
- Publication number
- CA1186167A CA1186167A CA000413055A CA413055A CA1186167A CA 1186167 A CA1186167 A CA 1186167A CA 000413055 A CA000413055 A CA 000413055A CA 413055 A CA413055 A CA 413055A CA 1186167 A CA1186167 A CA 1186167A
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- Canada
- Prior art keywords
- air
- sampling device
- vacuum
- sampling
- collection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Sampling And Sample Adjustment (AREA)
Abstract
AIR SAMPLING DEVICE
ABSTRACT
An air sampling device useful in measuring the amount of contaminant in an ambient gas atmosphere is disclosed comprising: a body portion having a cavity at the base thereof, porous collection element means therebelow and vacuum port means associated with the base of. said body portion and positioned to draw a vacuum on said cavity through said porous collection element means from a remote vacuum generator through said port means.
S P E C I F I C A T I O N
ABSTRACT
An air sampling device useful in measuring the amount of contaminant in an ambient gas atmosphere is disclosed comprising: a body portion having a cavity at the base thereof, porous collection element means therebelow and vacuum port means associated with the base of. said body portion and positioned to draw a vacuum on said cavity through said porous collection element means from a remote vacuum generator through said port means.
S P E C I F I C A T I O N
Description
~1~36~1~7 12,676 The air sampling device of the present invention relates to a tool in the field of industrial hygiene and air pollution. This air sampling device is capable of determining concentrations of pollutants in particulate, gaseous, and vaporous state~.
The current methods of air contaminant sample collection involve the collection of particulate matter by membrane filtration techniques and the collection of gases and vapors by adsorption on activated carbon tubes or pa~sive dosimeters. Adsorpt;on tube samples are collected by means of vacuum pump while passive dosimeters are dependent upon the rate of diffusion of an air contaminant.
The deficiencies of the membrane filter technique are that the membrane filter have to be transferred to another container before any analysis can be atte~pted. During the transfer of the filter, it is easy to lose some or all of the particulate contaminant which has been collected.
The major disadvantages of the adsorption tube technique is that the adsorption bed has to be transferred after collection to another container prior to analysis. This technique is only applicable to the determination of gas and vapors in air.
Pas~iv~ dosimeters of diffusion techniques are not applicable to th~ determination of particulate matter in air and are totally dependent upon the diffusion of ~ contaminant in air.
For the most part, all of the passive sampling
The current methods of air contaminant sample collection involve the collection of particulate matter by membrane filtration techniques and the collection of gases and vapors by adsorption on activated carbon tubes or pa~sive dosimeters. Adsorpt;on tube samples are collected by means of vacuum pump while passive dosimeters are dependent upon the rate of diffusion of an air contaminant.
The deficiencies of the membrane filter technique are that the membrane filter have to be transferred to another container before any analysis can be atte~pted. During the transfer of the filter, it is easy to lose some or all of the particulate contaminant which has been collected.
The major disadvantages of the adsorption tube technique is that the adsorption bed has to be transferred after collection to another container prior to analysis. This technique is only applicable to the determination of gas and vapors in air.
Pas~iv~ dosimeters of diffusion techniques are not applicable to th~ determination of particulate matter in air and are totally dependent upon the diffusion of ~ contaminant in air.
For the most part, all of the passive sampling
- 2 - ~
~6~
12,676 devices presently in use are designed with a single approach to collecting organic vapors. The basic principle is the diffusion or permeation o the vapor through a membrane onto a collection element or bed of adsorbeion material.
~ he following are the names of the various companies presently producing passive sa~pling devices, the patent numbers involved, and date of patent issuance:
3M Company U.S. Patent 3,950,980 April 20, 1976 Abcor, Inc. U.S. Patent 3,985,017 October 12, 1976 DuPont REAL U.S. Patent 4,040,805 August 9, 1977 The 3M Brand Organic Vapor Monitor ~3500 is a badge assembly to be worn near the breathing zone of personnel exposed to potentially hazardous organic vapor environments. It is designed to measure time-wei~hted average concentrations over a measured time interval of 8 hour3 or less. The monitor requires no sampling pump. It is analyzed using techniques similar to those outlined in NIOSH Method Physical and Chemical Analytical Method 127 for charcoal tubes. Analytical assay i5 correlated to environmental contaminant concentrations using data supplied by 3M Company.
The Abcor Gasbadge Or~anic Vapor Dosimeter samples th~ organic solvent in air by allowing the organic solvents to diffuse through a diffusion layer over a known period of time and trapping the organic vapors pre~ent on an activated carbon collection ele~ent. ~he activated carbon collection element in the do-~imeter i~ transferred to a small capped ~ial and de~orbed with carbon disul~ide or other suitable element.
~86~ 12,676 DuPont "Pro~Tek" Organic Vapor G~AA Air Monitoring Badge is a passive badge monitor used to determine the time-weighted average concentration of organic vapor contaminants in air. It i~ designed to be worn near the breathing zone of personnel exposed to potentially hazardous envirorments. After exposure, the badges are analyzed with gas chromatographic procedures similar to those outlined in NIOSH Method Physical and Chemical Analytical Method 127 for charcoal tubes. It can be used for sampling times ranging from 15 minutes to 16 hours.
The Mini ~onitor from REAL utilizes the permeation sampling principle. It is designed to be worn near the breathing zone. They claim the rate of collection of vinyl chloride is linear from 5 ppb to at lea~t 50 ppm. Sampling consist of placing activated charcoal in the monitor and clippin~ the monitor to the individual. The charcoal is removed at the end of the sampling period and analy~ed by one of the conventional techniques for the pollutants of interest.
Adsorption tube air samling is the most widely used methods for monitoring gases and vapors in the industrial hygiene field. The basic principles employed in adsorption tube air sampling are that a known volume of air i~ drawn through a charcoal tube or another adsor-bent to trap the airborne contaminant by means of a vacuu~ pump. The analyte i desorbe~ from ~he adsorbent with carbon disulfide or another solvent which is capable of removing the analyte with good efficiency. ~n aliquot ~18~6~
12,676 of the solution i5 analyzed using a gas chromatograph with a flame ionization detector.
The state of the art of collection of airborne particulate matter involves the collection of fumes, mists and dusts on membrane filters. The filters are ashed or desorbed with a solvent and analyzed by x-ray diffractometry, atomic absorption spectrometry, or gas chromatography.
In accordance with the present invention, an air sampling device useful in measuring the amount of contaminant in an ambient gas atmosphere is provided comprising: a body portion having a cavity at the base thereof, porous collection element means therebelow and vacuum port means associated with the base of said body portion and positioned to draw a vacuum on said cavity through said porous collection element means from a xemote vacuum generator through said port means. The air sampling device may also employ a removable cover provided with an air inlet port means for controlling the air throughout to the device and a solvent and sample access means for providing access to the porous collection element means within the device.
The air sampling device of the invention is a lightweight devic2 to be worn near the breathing zone to coll~ct airborne contaminants in gaseous, vaporous, and particulate state~ use the basic principle of diffusion and sorbent tube sampling by vacuum pump for organic vapors. It also has ~he ability to ~e used in conjunctian with a sampling pump ~o collect a large ~ 6~ 12,67~
volume of organic vapor and particulates with a modification in the collection element.
The air ~ampling device of the invention can easily be adapted to be used in conjunction with the present accepted methods for determining personal exposure to all forms of particulate matter.
The uniqueness of the sampling device of the invention is that it could conceivably replace several sample devices presently used in personnel monitorin~, by sirnply altering various parts of the device.
Standard 37 mm porous filters are used in the collection of particulates and any one of a wide variety of commercially available material filter cloths can be used as the collection element for dosimetry collection. Al50, by inserting a stainless steel screen or other retaining barrier to hold the solid adsorbent of choice in place, the instrument can be attached to a sampling pump to pull through a known volume of air.
The air sampling device of the iniention has two primary applications in air sampling and analysis.
These applications are the adsorption of chemicals by passive sampling or by means of vacuum source on interchangeable collection elements, and the collection of particulate matter by means of impaction on filter media. The filter media collection of particulates is accomplished with the aid of vacuum pumps ~ecause of the need for high transport veIocities for particles. In thi~ sen~e, the sampling device is referred to as a `'multiple purpose air sampling device" (MASD)o ~ 12,676 The instrument embodiment shown and discussed herein is such that it can be used with personal sampling pump and cyclone for particulate ~amples. It uses standard size filters for particulate sampling.
The ability to incorporate various collection techniques is the greatest advanta~e of the MASD over other similar devices which are designed to collect one specific type of contaminant.
In the drawings:
Fig. 1 is a side elevational view of an air sampling device (with cover) for practicing the vacuum assisted mode o~ air sampling;
Fig. 2 is a top view of the sampling device Oc Fig. 1, Fig. 3 is an elevational, cross-sectional view of the body portion of a sampling device embodying the invention;
Fig. 4 is a top view of the sampling device of ~ig. 3:
Fig. 5 is a top view of the collection element support employed in the sampling device of the invention:
Fig. 6 is a top view of a diffusion membrane and holder frame assembly for use in the sampling device of the invention in the passive mode of operation; and Fig. 7 is a top view of the collection element employed in the air sampling device of the invention.
Ra~erring speci ically to the embodiment of Fi~s. 1 - 4 o~ the drawings, an air sampling device iQ
shown co~prising a body portion lO having support 6~
12,676 elements 12 and suction port means 14 (provided with a cap 1~) associated with the base of the body portion 10 and positioned to draw the vacuum on the internal cavity within the body portion 10. Clip means 18 i5 provided to secure the device to the clothing of the person wearing it.
The sample device is provided with a cover 20 registering with the sampling device body 10 and having on its top a centrally positioned air entry port means 22 (provided with cover cap 24) and an off-centered solvent entry port means ~6 ~provided with cap 28).
The sampling device shown in Figs. 1 and 2 is employed with the vacuum or suction-assisted mode of operation, thereby requiring the cover means 20 and an air entry port means 22 which assists in controlling the rate of flow of air through the device and, consequently, the rate of deposi~ion of contaminants on the collection element within the device. After exposure to the atmosphere of contaminated air, the device is removed from ~he wearer, the air entry port 22 is capped by means 24, cap 28 is removed from solvent entry port 26 and solvent treatment is begun for contaminant measuring testing.
Internally, as shown in Figs. 3 and 4 of the drawings, the sampling device contains an internal cavity 3Q, the lower portion of which communicates with suction port means 14.
The base of the cavity 30 is provided with an arrangement of base support mean~ 32 and 36 on which ~616~
12,676 rests collection element support means 38 and on which, in turn, the collection element 34 rests. The collection element is retainecl in place by an outer circular "0" ring 39.
When the sampling device is utilized in the passive mode of operation, the cover 20 is removed and diffus.ion membrane 40, supported by a holder frame 42, and support incans 38, both as shown in Figs. 5 and 6 of the drawings, are employed, suported by the upper lip of 1~ body portion 10.
In the vacuum-assisted mode of operation, cap 16 i9 removed from vacuum port means 14 and the vacuum port means is supported, through suitable vacuum cond~it means 44, to suitable sampling pump means 46 selected to be capable of developing a vacuum sufficient to pull a known volume of air through ~he sampling device. Vacuum pumps of this type are generally well known ~ se and may be selected from the high or low flow rate personal sampling pumps presently available commercially. They are battery-opera~ed, and worn by personnel for personal air samplingO Portable vacuum pumps of this type include, among others: Mine Safety Appliance Portable Pump, Model G, Part No. 456058; and SKC, IncO Port~ble Sampling Pump, Model NoO 222-3.
The proper selection of cro-~s-sectional area of air entry port means ~2 and sampling pump flow rate capacity will determine the flow rate through the sampling de~ice, based on the porosity of the selected porous collection element means.
_ g _ ~1~6~ 12~676 In operation of the vacuum ~ode, the suction of the vacuum pump developed over the period of sampling results in the deposition o~ particulate gaseous and vaporous ~aterial on the collection element surface.
The personal sampling device ilS then removed from the wearer, the air entry port and vacuum port~ are capped, and ~olvent is in~eeted through the 601vent entry port means (as by hypodermic syringe) after rem~val of cap ~80 After a suitable period for reaction of the sample with the injected solvent, quantities of the reaction product are removed from the collection element surface and introduced into the various te~ting devices, such as d;f~rc~ct;on u~.
chromatographic analyzers, X-ray dc~Faa-tien analyzers, 9 atomic absorption spectrometers and the like, all of which are w~ll known instruments to those skilled in the analytical art.
Propylene oxide, triethylamine, and methyl chloride have been used to evaluate the MASD for vaporou~ compounds. The performance testing compared M~SD to ~olid sorbent tubes and the 3-M Organic VApor monitor. Known concentrations of each compound were dynamically produced and sampled. Gas chromatographic analyses were performed, comparing results to previously prepared calibration curves. In both cases the ~SD
performed as well or better than the other two methods.
Performance Testin~ of MASD
Gas Samplin~
The Multipurpose Air Sampling Device was tested by ~ampling a known concentration of methyl chloride.
~ 67 12,~76 Methyl chloride was chosen because of adverse and/or inad2quate interaction with the sorbent as advertised by 3M as to the operation of their 3M Brand Organic Vapor Monitor ~3500. (See page 3 of 3M Organic Vapor Monitor Compound Guide~. The procedure basically involved the aspiration of the methyl choride concentration in a bag through the (MAS~) at 50cc per minute. Ninety-six percent of the e~pectea methyl chloride coneentration was recovered from he MASD.
Particulate Samplin~: ' Known concentrations of diethanolamine and triethanolamine were used to spike the MASD's filter elemen~ (glass fiber) and 90 percent RH air was aspirated through the Multipurpose Air Sampling Device at a liter per minute. The alkanolamines were extracted by the addition of methanol to the inside of the air r~2c~ cr~d ~c sampling device. The ~eee~ve~ed concentrations were within 90 percen~ of the expected value. ~o state of the art device is capable of performing in this manner.
The following Table I sets forth such performance test results for the MASD.
12,676 TABLE I
Performance Testing Re~ults for the ~ SD
Usin~ Methxl Chloride Actual PPM Recover~d MASD Percent Concentration PPM Concent ation _covery 200 192 ~6 ~00 190 95 Using Diethanolamine 8 7.2 90 8 7.25 90.6 U~in~ Triethanolamine ~ 7.2 90 8 7.25 90.6 The following tables set forth comparative data for the MASD of the present invention as against prior sampling devices currently available commercially.
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9 L 9 ' z -r, 12,676 TABLE I I I
COMPARATIVE DATA FOR THE MASD AND OTHER AIR
SAMPLING DEVICES -- PROPYLENE OXIDE
AIR SAMPLE TOTAL PPM PPM PERCENT
DEVICE: VOLUME EXPECTED RECOVERED RECOVERY
CARBON TUBE 3 . 06 41.18 42, 09 102 3M OVM 1.98 41.18 42.38 103 3M OVM 1. 98 41.18 41. 30 100 ~SD 2 .14 41 .18 44 . 82 108 MASD 2.14 41.18 ~43D86 107 4 /~&
~86~
12,676 The sampling device of the invention has the advantages over conventional air samplers in that:
desorption of all forms of contaminants is accomplished without removal from the air sampling syste~ itself;
the device is compatible with the present accspted methods for determining personal exposure to all forms of particulate matter;
the device can be used for area measurements of contaminants;
it can determine airborne contaminant level by diffusion collection on vacuum pump collection;
the air sampling device is reusable, and is adaptable to the determintion of all forms of contaminants by the addition of the p.oper sampling elements; and it eliminates the need for specific collection devices for a number of airborne contaminants.
~6~
12,676 devices presently in use are designed with a single approach to collecting organic vapors. The basic principle is the diffusion or permeation o the vapor through a membrane onto a collection element or bed of adsorbeion material.
~ he following are the names of the various companies presently producing passive sa~pling devices, the patent numbers involved, and date of patent issuance:
3M Company U.S. Patent 3,950,980 April 20, 1976 Abcor, Inc. U.S. Patent 3,985,017 October 12, 1976 DuPont REAL U.S. Patent 4,040,805 August 9, 1977 The 3M Brand Organic Vapor Monitor ~3500 is a badge assembly to be worn near the breathing zone of personnel exposed to potentially hazardous organic vapor environments. It is designed to measure time-wei~hted average concentrations over a measured time interval of 8 hour3 or less. The monitor requires no sampling pump. It is analyzed using techniques similar to those outlined in NIOSH Method Physical and Chemical Analytical Method 127 for charcoal tubes. Analytical assay i5 correlated to environmental contaminant concentrations using data supplied by 3M Company.
The Abcor Gasbadge Or~anic Vapor Dosimeter samples th~ organic solvent in air by allowing the organic solvents to diffuse through a diffusion layer over a known period of time and trapping the organic vapors pre~ent on an activated carbon collection ele~ent. ~he activated carbon collection element in the do-~imeter i~ transferred to a small capped ~ial and de~orbed with carbon disul~ide or other suitable element.
~86~ 12,676 DuPont "Pro~Tek" Organic Vapor G~AA Air Monitoring Badge is a passive badge monitor used to determine the time-weighted average concentration of organic vapor contaminants in air. It i~ designed to be worn near the breathing zone of personnel exposed to potentially hazardous envirorments. After exposure, the badges are analyzed with gas chromatographic procedures similar to those outlined in NIOSH Method Physical and Chemical Analytical Method 127 for charcoal tubes. It can be used for sampling times ranging from 15 minutes to 16 hours.
The Mini ~onitor from REAL utilizes the permeation sampling principle. It is designed to be worn near the breathing zone. They claim the rate of collection of vinyl chloride is linear from 5 ppb to at lea~t 50 ppm. Sampling consist of placing activated charcoal in the monitor and clippin~ the monitor to the individual. The charcoal is removed at the end of the sampling period and analy~ed by one of the conventional techniques for the pollutants of interest.
Adsorption tube air samling is the most widely used methods for monitoring gases and vapors in the industrial hygiene field. The basic principles employed in adsorption tube air sampling are that a known volume of air i~ drawn through a charcoal tube or another adsor-bent to trap the airborne contaminant by means of a vacuu~ pump. The analyte i desorbe~ from ~he adsorbent with carbon disulfide or another solvent which is capable of removing the analyte with good efficiency. ~n aliquot ~18~6~
12,676 of the solution i5 analyzed using a gas chromatograph with a flame ionization detector.
The state of the art of collection of airborne particulate matter involves the collection of fumes, mists and dusts on membrane filters. The filters are ashed or desorbed with a solvent and analyzed by x-ray diffractometry, atomic absorption spectrometry, or gas chromatography.
In accordance with the present invention, an air sampling device useful in measuring the amount of contaminant in an ambient gas atmosphere is provided comprising: a body portion having a cavity at the base thereof, porous collection element means therebelow and vacuum port means associated with the base of said body portion and positioned to draw a vacuum on said cavity through said porous collection element means from a xemote vacuum generator through said port means. The air sampling device may also employ a removable cover provided with an air inlet port means for controlling the air throughout to the device and a solvent and sample access means for providing access to the porous collection element means within the device.
The air sampling device of the invention is a lightweight devic2 to be worn near the breathing zone to coll~ct airborne contaminants in gaseous, vaporous, and particulate state~ use the basic principle of diffusion and sorbent tube sampling by vacuum pump for organic vapors. It also has ~he ability to ~e used in conjunctian with a sampling pump ~o collect a large ~ 6~ 12,67~
volume of organic vapor and particulates with a modification in the collection element.
The air ~ampling device of the invention can easily be adapted to be used in conjunction with the present accepted methods for determining personal exposure to all forms of particulate matter.
The uniqueness of the sampling device of the invention is that it could conceivably replace several sample devices presently used in personnel monitorin~, by sirnply altering various parts of the device.
Standard 37 mm porous filters are used in the collection of particulates and any one of a wide variety of commercially available material filter cloths can be used as the collection element for dosimetry collection. Al50, by inserting a stainless steel screen or other retaining barrier to hold the solid adsorbent of choice in place, the instrument can be attached to a sampling pump to pull through a known volume of air.
The air sampling device of the iniention has two primary applications in air sampling and analysis.
These applications are the adsorption of chemicals by passive sampling or by means of vacuum source on interchangeable collection elements, and the collection of particulate matter by means of impaction on filter media. The filter media collection of particulates is accomplished with the aid of vacuum pumps ~ecause of the need for high transport veIocities for particles. In thi~ sen~e, the sampling device is referred to as a `'multiple purpose air sampling device" (MASD)o ~ 12,676 The instrument embodiment shown and discussed herein is such that it can be used with personal sampling pump and cyclone for particulate ~amples. It uses standard size filters for particulate sampling.
The ability to incorporate various collection techniques is the greatest advanta~e of the MASD over other similar devices which are designed to collect one specific type of contaminant.
In the drawings:
Fig. 1 is a side elevational view of an air sampling device (with cover) for practicing the vacuum assisted mode o~ air sampling;
Fig. 2 is a top view of the sampling device Oc Fig. 1, Fig. 3 is an elevational, cross-sectional view of the body portion of a sampling device embodying the invention;
Fig. 4 is a top view of the sampling device of ~ig. 3:
Fig. 5 is a top view of the collection element support employed in the sampling device of the invention:
Fig. 6 is a top view of a diffusion membrane and holder frame assembly for use in the sampling device of the invention in the passive mode of operation; and Fig. 7 is a top view of the collection element employed in the air sampling device of the invention.
Ra~erring speci ically to the embodiment of Fi~s. 1 - 4 o~ the drawings, an air sampling device iQ
shown co~prising a body portion lO having support 6~
12,676 elements 12 and suction port means 14 (provided with a cap 1~) associated with the base of the body portion 10 and positioned to draw the vacuum on the internal cavity within the body portion 10. Clip means 18 i5 provided to secure the device to the clothing of the person wearing it.
The sample device is provided with a cover 20 registering with the sampling device body 10 and having on its top a centrally positioned air entry port means 22 (provided with cover cap 24) and an off-centered solvent entry port means ~6 ~provided with cap 28).
The sampling device shown in Figs. 1 and 2 is employed with the vacuum or suction-assisted mode of operation, thereby requiring the cover means 20 and an air entry port means 22 which assists in controlling the rate of flow of air through the device and, consequently, the rate of deposi~ion of contaminants on the collection element within the device. After exposure to the atmosphere of contaminated air, the device is removed from ~he wearer, the air entry port 22 is capped by means 24, cap 28 is removed from solvent entry port 26 and solvent treatment is begun for contaminant measuring testing.
Internally, as shown in Figs. 3 and 4 of the drawings, the sampling device contains an internal cavity 3Q, the lower portion of which communicates with suction port means 14.
The base of the cavity 30 is provided with an arrangement of base support mean~ 32 and 36 on which ~616~
12,676 rests collection element support means 38 and on which, in turn, the collection element 34 rests. The collection element is retainecl in place by an outer circular "0" ring 39.
When the sampling device is utilized in the passive mode of operation, the cover 20 is removed and diffus.ion membrane 40, supported by a holder frame 42, and support incans 38, both as shown in Figs. 5 and 6 of the drawings, are employed, suported by the upper lip of 1~ body portion 10.
In the vacuum-assisted mode of operation, cap 16 i9 removed from vacuum port means 14 and the vacuum port means is supported, through suitable vacuum cond~it means 44, to suitable sampling pump means 46 selected to be capable of developing a vacuum sufficient to pull a known volume of air through ~he sampling device. Vacuum pumps of this type are generally well known ~ se and may be selected from the high or low flow rate personal sampling pumps presently available commercially. They are battery-opera~ed, and worn by personnel for personal air samplingO Portable vacuum pumps of this type include, among others: Mine Safety Appliance Portable Pump, Model G, Part No. 456058; and SKC, IncO Port~ble Sampling Pump, Model NoO 222-3.
The proper selection of cro-~s-sectional area of air entry port means ~2 and sampling pump flow rate capacity will determine the flow rate through the sampling de~ice, based on the porosity of the selected porous collection element means.
_ g _ ~1~6~ 12~676 In operation of the vacuum ~ode, the suction of the vacuum pump developed over the period of sampling results in the deposition o~ particulate gaseous and vaporous ~aterial on the collection element surface.
The personal sampling device ilS then removed from the wearer, the air entry port and vacuum port~ are capped, and ~olvent is in~eeted through the 601vent entry port means (as by hypodermic syringe) after rem~val of cap ~80 After a suitable period for reaction of the sample with the injected solvent, quantities of the reaction product are removed from the collection element surface and introduced into the various te~ting devices, such as d;f~rc~ct;on u~.
chromatographic analyzers, X-ray dc~Faa-tien analyzers, 9 atomic absorption spectrometers and the like, all of which are w~ll known instruments to those skilled in the analytical art.
Propylene oxide, triethylamine, and methyl chloride have been used to evaluate the MASD for vaporou~ compounds. The performance testing compared M~SD to ~olid sorbent tubes and the 3-M Organic VApor monitor. Known concentrations of each compound were dynamically produced and sampled. Gas chromatographic analyses were performed, comparing results to previously prepared calibration curves. In both cases the ~SD
performed as well or better than the other two methods.
Performance Testin~ of MASD
Gas Samplin~
The Multipurpose Air Sampling Device was tested by ~ampling a known concentration of methyl chloride.
~ 67 12,~76 Methyl chloride was chosen because of adverse and/or inad2quate interaction with the sorbent as advertised by 3M as to the operation of their 3M Brand Organic Vapor Monitor ~3500. (See page 3 of 3M Organic Vapor Monitor Compound Guide~. The procedure basically involved the aspiration of the methyl choride concentration in a bag through the (MAS~) at 50cc per minute. Ninety-six percent of the e~pectea methyl chloride coneentration was recovered from he MASD.
Particulate Samplin~: ' Known concentrations of diethanolamine and triethanolamine were used to spike the MASD's filter elemen~ (glass fiber) and 90 percent RH air was aspirated through the Multipurpose Air Sampling Device at a liter per minute. The alkanolamines were extracted by the addition of methanol to the inside of the air r~2c~ cr~d ~c sampling device. The ~eee~ve~ed concentrations were within 90 percen~ of the expected value. ~o state of the art device is capable of performing in this manner.
The following Table I sets forth such performance test results for the MASD.
12,676 TABLE I
Performance Testing Re~ults for the ~ SD
Usin~ Methxl Chloride Actual PPM Recover~d MASD Percent Concentration PPM Concent ation _covery 200 192 ~6 ~00 190 95 Using Diethanolamine 8 7.2 90 8 7.25 90.6 U~in~ Triethanolamine ~ 7.2 90 8 7.25 90.6 The following tables set forth comparative data for the MASD of the present invention as against prior sampling devices currently available commercially.
6~L~i7 æ
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9 L 9 ' z -r, 12,676 TABLE I I I
COMPARATIVE DATA FOR THE MASD AND OTHER AIR
SAMPLING DEVICES -- PROPYLENE OXIDE
AIR SAMPLE TOTAL PPM PPM PERCENT
DEVICE: VOLUME EXPECTED RECOVERED RECOVERY
CARBON TUBE 3 . 06 41.18 42, 09 102 3M OVM 1.98 41.18 42.38 103 3M OVM 1. 98 41.18 41. 30 100 ~SD 2 .14 41 .18 44 . 82 108 MASD 2.14 41.18 ~43D86 107 4 /~&
~86~
12,676 The sampling device of the invention has the advantages over conventional air samplers in that:
desorption of all forms of contaminants is accomplished without removal from the air sampling syste~ itself;
the device is compatible with the present accspted methods for determining personal exposure to all forms of particulate matter;
the device can be used for area measurements of contaminants;
it can determine airborne contaminant level by diffusion collection on vacuum pump collection;
the air sampling device is reusable, and is adaptable to the determintion of all forms of contaminants by the addition of the p.oper sampling elements; and it eliminates the need for specific collection devices for a number of airborne contaminants.
Claims
1. An air sampling device useful in measuring the amount of contaminants in an ambient gas atmosphere, comprising a body portion having a cavity at the base thereof, porous collection element means therebelow;
vacuum port means associated with the base of said body portion and positioned to draw a vacuum on said cavity through said porous collection element means from a remote vacuum generator through said port means;
holding means positioned near said collection means for holding a filter; and a removable cover having an opening for passing gas to be measured in conjunction with said vacuum generator and capable of providing an enlarged opening for gas when removed for the collection of gas without the use of said vacuum generator.
vacuum port means associated with the base of said body portion and positioned to draw a vacuum on said cavity through said porous collection element means from a remote vacuum generator through said port means;
holding means positioned near said collection means for holding a filter; and a removable cover having an opening for passing gas to be measured in conjunction with said vacuum generator and capable of providing an enlarged opening for gas when removed for the collection of gas without the use of said vacuum generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000413055A CA1186167A (en) | 1982-10-07 | 1982-10-07 | Air sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000413055A CA1186167A (en) | 1982-10-07 | 1982-10-07 | Air sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1186167A true CA1186167A (en) | 1985-04-30 |
Family
ID=4123739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000413055A Expired CA1186167A (en) | 1982-10-07 | 1982-10-07 | Air sampling device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1186167A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2360817A (en) * | 2000-03-30 | 2001-10-03 | Astrazeneca Uk Ltd | Monitoring device and clip |
| CN107328616A (en) * | 2017-08-09 | 2017-11-07 | 厦门鉴科检测技术有限公司 | It is a kind of while gathering the ammonia and the method and device of organic amine of gaseous state and particulate form |
-
1982
- 1982-10-07 CA CA000413055A patent/CA1186167A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2360817A (en) * | 2000-03-30 | 2001-10-03 | Astrazeneca Uk Ltd | Monitoring device and clip |
| CN107328616A (en) * | 2017-08-09 | 2017-11-07 | 厦门鉴科检测技术有限公司 | It is a kind of while gathering the ammonia and the method and device of organic amine of gaseous state and particulate form |
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| MKEX | Expiry |