CN111257181A - Method for measuring total dust concentration - Google Patents
Method for measuring total dust concentration Download PDFInfo
- Publication number
- CN111257181A CN111257181A CN202010084858.6A CN202010084858A CN111257181A CN 111257181 A CN111257181 A CN 111257181A CN 202010084858 A CN202010084858 A CN 202010084858A CN 111257181 A CN111257181 A CN 111257181A
- Authority
- CN
- China
- Prior art keywords
- filter membrane
- sampling
- dust
- dust concentration
- filter
- 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.)
- Pending
Links
- 239000000428 dust Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000012528 membrane Substances 0.000 claims abstract description 52
- 238000005070 sampling Methods 0.000 claims abstract description 42
- 238000005303 weighing Methods 0.000 claims description 12
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 230000036541 health Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for measuring total dust concentration, which comprises the following steps: step 1, preparing a filter membrane; step 2, sampling; step 3, analyzing and calculating dust concentration; wherein, the dust concentration formula is as follows:
wherein C is the dust concentration mg/m3，m1The mass of the filter membrane before sampling is mg, m2The mass mg of the filter membrane after sampling, t is the sampling duration min, and Q is the sampling flow L/min. The method for measuring the total dust concentration is scientific and reasonable, convenient to operate and accurate in result.
Description
Technical Field
The invention relates to the technical field of dust testing, in particular to a method for measuring total dust concentration.
Background
Workplace refers to all locations where workers are performing professional activities. Airborne dust refers to solid particles that are suspended in air for extended periods of time.
Workers repeatedly contact a certain amount of dust for a long time in the process of professional activities, and harm can be caused to human health.
Therefore, in order to evaluate the hazard of dust in a workplace, enhance scientific management of dust prevention measures, and protect the physical health of workers, dust in the air of the workplace needs to be detected.
Disclosure of Invention
The invention aims to provide a method for measuring the total dust concentration, which is scientific and reasonable, convenient to operate and accurate in result.
In order to achieve the above object, the present invention provides a total dust concentration measuring method comprising:
step 1, preparing a filter membrane;
step 2, sampling;
step 3, analyzing and calculating dust concentration; wherein,
the dust concentration calculation formula is as follows:
wherein C is the dust concentration mg/m3，m1The mass of the filter membrane before sampling is mg, m2The mass mg of the filter membrane after sampling, t is the sampling duration min, and Q is the sampling flow L/min.
Preferably, step 1 comprises first weighing the filter membrane, then placing the filter membrane onto the filter clamp of the dust sampler and numbering for storage.
Preferably, the dust sampler is an explosion-proof type dust sampler.
Preferably, the filter membrane is a perchloroethylene fiber filter membrane, wherein the diameter of the perchloroethylene fiber filter membrane is 40mm, the retention rate of oil mist is 0.3 mu m, the dust retention rate is more than 99 percent, the resistance is 20L/min, and the filter area is 8cm2＜1000pa。
Preferably, the step 2 comprises putting the filter membrane clamp into the sampling head and screwing, and meanwhile, enabling the dust surface of the filter membrane to face the airflow, wherein the sampling flow is kept constant at 20L/min; and after sampling is finished, closing the sampler, taking out the filter membrane clamp, putting the filter membrane clamp into a storage box, bringing the filter membrane clamp back to a laboratory for analysis, and finally recording the environment and conditions of field sampling.
Preferably, the sampling duration is 15 min.
Preferably, the analysis in step 3 comprises weighing and recording with an analytical balance when drying is not required; and if the on-site relative humidity is more than 90% or water mist exists, putting the sample in a dryer for 2h, weighing, recording, putting the sample in the dryer for 30min, weighing, and taking the minimum value of the two samples when the mass difference between the two samples does not exceed 0.1 mg.
According to the technical scheme, the method comprises the steps of preparing a filter membrane, sampling, analyzing and calculating the dust concentration; wherein, a dust concentration calculation formula is utilized:
the calculated result is accurate and effective, the dust concentration is clearly measured, the working environment is assisted to be improved, and the dust concentration is guaranteedThe health of workers is proved, the occurrence of production accidents is reduced, and the safety of production and processing is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view showing the structure of a sampling head used in a method for measuring the concentration of total dust in the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the directional words "upper, lower" and the like included in the terms merely represent the orientation of the terms in the conventional use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.
Referring to fig. 1, the present invention provides a total dust concentration measuring method including:
step 1, preparing a filter membrane;
step 2, sampling;
step 3, analyzing and calculating dust concentration; wherein,
the dust concentration calculation formula is as follows:
wherein C is the dust concentration mg/m3，m1The mass of the filter membrane before sampling is mg, m2The mass mg of the filter membrane after sampling, t is the sampling duration min, and Q is the sampling flow L/min.
In this embodiment, in order to facilitate labeling of the dust measurement control group and to improve the intuitiveness of the result after measurement, step 1 preferably includes first weighing the filter membrane, then placing the filter membrane on the filter membrane holder of the dust sampler and numbering for storage.
In order to improve the safety of the total dust concentration measuring method in the operation process, the dust sampler is preferably an explosion-proof dust sampler.
In addition, in order to ensure the result of the measurement by the filter membrane to be accurate and reliable, the filter membrane is preferably a perchloroethylene fiber filter membrane, wherein the diameter of the perchloroethylene fiber filter membrane is 40mm, the retention rate of oil mist is 0.3 μm, the dust blocking rate is more than 99 percent, the resistance is 20L/min, and the filtering area is 8cm2＜1000pa。
Wherein, the perchloroethylene fiber filter membrane has high dust-resistant rate, small resistance, light weight, strong charge property and hydrophobicity.
Moreover, the influence of the humidity of the filter membrane is that the mass change is not more than 0.1 percent, and the glass fiber filter membrane can be changed when the filter membrane does not resist high temperature.
Step 2, placing the filter membrane clamp into a sampling head, screwing down, and enabling the dust surface of the filter membrane to face the airflow at the same time, wherein the sampling flow is kept constant at 20L/min; and after sampling is finished, closing the sampler, taking out the filter membrane clamp, putting the filter membrane clamp into a storage box, bringing the filter membrane clamp back to a laboratory for analysis, and finally recording the environment and conditions of field sampling.
The sampling head is used for fixing the filter membrane and consists of a top cover, a filter membrane clamp and a base, and the filter membrane clamp consists of a clamp cover, a clamp ring and a clamp seat. The sampling heads need to be contacted tightly to ensure air tightness, air tightness test needs to be carried out if necessary, and no air bubbles are generated in water when the pressure difference is 1000 pa.
Further, the sampling duration is 15 min. The sampling time is timed by a stopwatch or timer equivalent to a stopwatch, and the timer on the sampler should be turned on or off in synchronization with the sampling switch.
In addition, in order to further accurately measure the dust, and avoid the moisture in the air from influencing the test result, forming errors and even causing the failure of the measurement operation, preferably, the analysis in the step 3 comprises weighing and recording by an analytical balance when drying is not needed; and if the on-site relative humidity is more than 90% or water mist exists, putting the sample in a dryer for 2h, weighing, recording, putting the sample in the dryer for 30min, weighing, and taking the minimum value of the two samples when the mass difference between the two samples does not exceed 0.1 mg.
Through the technical scheme, a filter membrane is prepared, sampling and analysis are performed, and dust concentration calculation is performed in sequence; wherein, a dust concentration calculation formula is utilized:
the calculated result is accurate and effective, the dust concentration is clearly measured, the working environment is assisted to be improved, the physical health of workers is ensured, the occurrence of production accidents is reduced, and the safety of production and processing is improved.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. A method for determining a total dust concentration, comprising:
step 1, preparing a filter membrane;
step 2, sampling;
step 3, analyzing and calculating dust concentration; wherein,
the dust concentration calculation formula is as follows:
wherein C is the dust concentration mg/m3，m1The mass of the filter membrane before sampling is mg, m2The mass mg of the filter membrane after sampling, t is the sampling duration min, and Q is the sampling flow L/min.
2. The method of claim 1, wherein step 1 comprises weighing the filter membrane, placing the filter membrane on a filter clamp of the dust sampler, and numbering the filter membrane for storage.
3. The method of claim 2, wherein the dust sampler is an explosion-proof dust sampler.
4. The method of claim 2, wherein the filter is a perchloroethylene fiber filter having a diameter of 40mm, a retention rate of 0.3 μm oil mist, a dust-blocking rate of > 99%, a resistance of 20L/min, and a filter area of 8cm2＜1000pa。
5. The method for measuring the total dust concentration according to claim 1, wherein the step 2 comprises placing the filter membrane holder in the sampling head and screwing the filter membrane holder, and simultaneously, making the dust surface of the filter membrane face the airflow, wherein the sampling flow rate is kept constant at 20L/min; and after sampling is finished, closing the sampler, taking out the filter membrane clamp, putting the filter membrane clamp into a storage box, bringing the filter membrane clamp back to a laboratory for analysis, and finally recording the environment and conditions of field sampling.
6. The method of claim 5, wherein the sampling duration is 15 min.
7. The method of claim 1, wherein the analyzing in step 3 comprises weighing and recording with an analytical balance when drying is not required; and if the on-site relative humidity is more than 90% or water mist exists, putting the sample in a dryer for 2h, weighing, recording, putting the sample in the dryer for 30min, weighing, and taking the minimum value of the two samples when the mass difference between the two samples does not exceed 0.1 mg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084858.6A CN111257181A (en) | 2020-02-10 | 2020-02-10 | Method for measuring total dust concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010084858.6A CN111257181A (en) | 2020-02-10 | 2020-02-10 | Method for measuring total dust concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111257181A true CN111257181A (en) | 2020-06-09 |
Family
ID=70949209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010084858.6A Pending CN111257181A (en) | 2020-02-10 | 2020-02-10 | Method for measuring total dust concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111257181A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070150162A1 (en) * | 2003-12-23 | 2007-06-28 | Renault S.A.S. | Method for real time determination of the mass of particles in a particle filter of a motor vehicle |
| CN203616179U (en) * | 2013-11-22 | 2014-05-28 | 淮南润成科技股份有限公司 | Dust sampler |
| CN203908828U (en) * | 2014-06-17 | 2014-10-29 | 桂伟 | Quantitative gas sampler |
| CN104330323A (en) * | 2014-11-14 | 2015-02-04 | 国家电网公司 | Method for reducing smoke dust concentration measurement errors of thermal power plant flue gas |
| CN104865150A (en) * | 2015-04-23 | 2015-08-26 | 云南方源科技有限公司 | Method for detection of dust content in air |
| CN107764706A (en) * | 2017-10-13 | 2018-03-06 | 广州弘雅服装科技有限公司 | A kind of dust sampling device and dust sampling method |
-
2020
- 2020-02-10 CN CN202010084858.6A patent/CN111257181A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070150162A1 (en) * | 2003-12-23 | 2007-06-28 | Renault S.A.S. | Method for real time determination of the mass of particles in a particle filter of a motor vehicle |
| CN203616179U (en) * | 2013-11-22 | 2014-05-28 | 淮南润成科技股份有限公司 | Dust sampler |
| CN203908828U (en) * | 2014-06-17 | 2014-10-29 | 桂伟 | Quantitative gas sampler |
| CN104330323A (en) * | 2014-11-14 | 2015-02-04 | 国家电网公司 | Method for reducing smoke dust concentration measurement errors of thermal power plant flue gas |
| CN104865150A (en) * | 2015-04-23 | 2015-08-26 | 云南方源科技有限公司 | Method for detection of dust content in air |
| CN107764706A (en) * | 2017-10-13 | 2018-03-06 | 广州弘雅服装科技有限公司 | A kind of dust sampling device and dust sampling method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104865150B (en) | A method of detection dust in air content | |
| JPS6111386B2 (en) | ||
| CN107014725A (en) | It is a kind of to handle method and a kind of method calibrated outside the venue by calibration dirt film that filter membrane obtains calibrating dirt film | |
| CN105842725A (en) | Method for detecting specific activity of tritiated steam in air | |
| CN101551338B (en) | Method for determining formaldehyde in air | |
| CN205015201U (en) | Collection system of chlorion deposition survey in atmospheric environment | |
| CN203561610U (en) | Self-calibrated expiration nitrogen monoxide analyzer | |
| CN108195895A (en) | A kind of tea leaf nitrogen content rapid detection method based on electronic nose and spectrophotometric color measurement instrument | |
| CN106153498A (en) | A kind of new method detecting solute concentration in solution and device thereof | |
| CN101408491A (en) | Equipment and method for measuring dust content in flue gas | |
| CN103487489A (en) | Self-calibration exhaled nitric oxide analyzer | |
| CN111257181A (en) | Method for measuring total dust concentration | |
| JP2009257838A (en) | Acidic gas detection pipe, quality monitoring method of indoor air and quality evaluating method of building material | |
| KR101275882B1 (en) | Continuous water vapor content measurement system of stack gas emissions | |
| CN107764706A (en) | A kind of dust sampling device and dust sampling method | |
| Tatum et al. | The performance of personal inhalable dust samplers in wood-products industry facilities | |
| CN201358807Y (en) | Air on-line detecting device of mine ventilator | |
| US5013668A (en) | Method of estimating a cumulative exposure to a compound of a gas and apparatus therefor | |
| CN208799901U (en) | A kind of partial flow filter for leak detector | |
| CN111289412A (en) | Individual dust sampling and measuring method | |
| CN203561532U (en) | Portable gas detector | |
| CN111024321A (en) | Method and device for detecting sealing performance of enclosure structure | |
| CN204910930U (en) | Filter of poor color board of grey standard level is arranged to preparation filter mouth neck | |
| CN105424637B (en) | A method for measuring the emission concentration of oil mist in the steel rolling industry | |
| CN211402331U (en) | Device for judging alcoholization degree of tobacco leaves based on pH value |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200609 |
|
| RJ01 | Rejection of invention patent application after publication |