CN115266898B - An accurate and stable method for determining mercury in water by ICP-MS - Google Patents
An accurate and stable method for determining mercury in water by ICP-MS Download PDFInfo
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- CN115266898B CN115266898B CN202210881392.1A CN202210881392A CN115266898B CN 115266898 B CN115266898 B CN 115266898B CN 202210881392 A CN202210881392 A CN 202210881392A CN 115266898 B CN115266898 B CN 115266898B
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- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 76
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 13
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000010931 gold Substances 0.000 claims abstract description 26
- 229910052737 gold Inorganic materials 0.000 claims abstract description 26
- XUJNEKJLAYXESH-REOHCLBHSA-N L-Cysteine Chemical compound SC[C@H](N)C(O)=O XUJNEKJLAYXESH-REOHCLBHSA-N 0.000 claims abstract description 20
- 230000029087 digestion Effects 0.000 claims abstract description 19
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000011088 calibration curve Methods 0.000 claims abstract description 14
- 235000013878 L-cysteine Nutrition 0.000 claims abstract description 10
- 239000004201 L-cysteine Substances 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims description 69
- 239000000243 solution Substances 0.000 claims description 17
- 239000012496 blank sample Substances 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 11
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 claims description 9
- PWKSKIMOESPYIA-UHFFFAOYSA-N 2-acetamido-3-sulfanylpropanoic acid Chemical compound CC(=O)NC(CS)C(O)=O PWKSKIMOESPYIA-UHFFFAOYSA-N 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 239000012086 standard solution Substances 0.000 claims description 3
- 239000012154 double-distilled water Substances 0.000 claims 1
- 150000002730 mercury Chemical class 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 12
- 239000012153 distilled water Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 6
- 238000005303 weighing Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 2
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000002795 fluorescence method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
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Abstract
本发明涉及一种准确、稳定的ICP‑MS测定水质中汞的方法，属于水质中汞测定技术领域。采用了金和L‑半胱氨酸与汞结合形成稳定的络合物，使得汞不会在管路里残留，过量的L‑半胱氨酸采用硫代乙二醇掩蔽，过量的硫代乙二醇不影响汞的测定。优点是解决了校准曲线线性系数不合格的问题，保证了样品测定过程中数据的准确度和精密度；采用电热板消解，大大的节约了消解时间；适合在环境领域、食品领域、医药领域中应用。The present invention relates to an accurate and stable ICP-MS method for determining mercury in water, and belongs to the technical field of determination of mercury in water. Gold and L-cysteine are combined with mercury to form a stable complex, so that mercury will not remain in the pipeline, and excess L-cysteine is masked by thioethylene glycol, and excess thioethylene glycol does not affect the determination of mercury. The advantages are that the problem of unqualified linear coefficient of calibration curve is solved, and the accuracy and precision of data in the sample determination process are guaranteed; the digestion is carried out by electric hot plate, which greatly saves digestion time; it is suitable for application in the environmental field, food field, and medical field.
Description
Technical Field
The invention belongs to the technical field of mercury determination in water quality, and particularly relates to an accurate and stable thiocyanate determination method.
Background
Mercury is a highly biotoxic persistent heavy metal contaminant in the environment, which is difficult to expel after entering organisms and severely threatens human health. Currently, the mercury in water is widely measured by an atomic fluorescence method (HJ 694-2014 atomic fluorescence method for measuring mercury, arsenic, selenium, bismuth and antimony) and a cold atomic absorption spectrophotometry (HJ 597-2011 atomic absorption spectrophotometry for measuring total mercury in water), and the two methods need to use multiple reagents, have complicated preparation process, can introduce larger errors, are extremely easy to produce mercury pollution, and also need to eliminate spectral interference and various physical interference caused by other metal elements so as to seriously influence the working efficiency of testers.
Because of the strong adsorption effect and instability of mercury, certain difficulties are brought to the measurement of mercury, particularly, once atomic fluorescence enters a high-concentration sample, the whole sample injection system is polluted, a large amount of time is required for flushing a pipeline, and the working efficiency is affected. With the gradual popularization of ICP-MS instruments, ICP-MS mercury measurement is less in application, less in literature and mainly the problem of mercury residue is not solved, so that the research and development of a method for measuring total mercury in water by using ICP-MS has important practical significance.
Disclosure of Invention
The invention provides an accurate and stable method for measuring mercury in water by ICP-MS, which aims to solve the problem that the ICP-MS cannot accurately measure mercury due to mercury residues.
The technical scheme adopted by the invention is that the method comprises the following steps:
Firstly, measuring 10-50 mL of a sample to a constant volume of 50mL according to the mercury content in the sample, moving the sample to a 250mL beaker, adding 2-4 mL of aqua regia, shaking the sample uniformly, adding 5mL of 2mg/L gold solution, placing the sample on an electric heating plate, controlling the temperature of the electric heating plate to be between 250 and 300 ℃, digesting for 45 minutes, taking down, and slightly cooling;
step two, adding 5mL of 100mg/L L-cysteine, controlling the temperature of an electric hot plate between 60 ℃ and 80 ℃, digesting for 15 minutes, taking down after digestion is finished, and cooling to room temperature;
transferring the digestion solution cooled to room temperature to a 50mL volumetric flask, adding 5mL of 100mg/L thioglycol, adding secondary distilled water to a volume of 50mL, shaking uniformly, standing for 10 minutes, and measuring;
Preparing standard series with mercury concentration of 0.00, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 mug/L in sequence, preparing the standard series into a volumetric flask of 100mL, adding 4mg/L gold in each standard series with 5mL of gold content of 200 mug/L, and drawing a calibration curve;
Step four, making a full-program blank along with the sample;
Step five, measuring a sample by ICP-MS;
step six, calculating the concentration of thiocyanate in the water sample according to the following formula:
Wherein, C is the concentration of mercury in the water sample, ug/L;
C 1 -find the concentration of mercury, ug/L from the standard curve;
C 2 -find the concentration of mercury in the blank sample, ug/L by the standard curve;
v-constant volume at constant volume, mL;
V 0 -the sampling volume of the sample, mL.
In the first step, the aqua regia preparation method comprises the step of mixing 3 volumes of hydrochloric acid and 1 volume of nitric acid.
In the first step, the preparation method of the 2mg/L gold solution comprises the steps of sucking 1000 mug/mL of a commercially available gold standard solution into a volumetric flask of 100mL, fixing the volume, shaking uniformly, sucking 10mL of diluent with the concentration of 20 mug/mL into the volumetric flask of 100mL, fixing the volume, and shaking uniformly.
In the second step, the preparation method of the L-cysteine comprises the step of weighing 100mg of L-cysteine and dissolving the L-cysteine in 1000mL of water.
In the third step, the preparation method of the thioglycol comprises the step of weighing 100mg of the thioglycol and dissolving the thioglycol in 1000mL of water.
The invention has the beneficial effects that:
1) The linear coefficient of the current ICP-MS mercury measuring calibration curve can not meet the use requirement, the accuracy and precision of a measured sample are extremely poor, and the linear coefficient is not popularized for ICP-MS mercury measuring. And further, the accuracy and precision of data in the sample measurement process are solved.
2) The problem of mercury remaining in the test instrument tubing is a major cause of poor accuracy and precision of data during the measurement of a sample. The invention combines gold, L-cysteine and mercury to form a stable complex, uses few reagents, is accurate and quick, so that mercury can not remain in a pipeline, excessive L-cysteine is masked by thioglycol, the excessive thioglycol does not influence the measurement of mercury, and the mercury measurement precision of ICP-MS is greatly improved. Meets the requirement that the standard of class I and class II water in GB 3838-2002 surface water environment quality standard is limited to 0.05 mug/L. And meanwhile, the mercury-containing sample with higher concentration can be measured.
3) The method can select a more convenient, accurate and quick digestion mode, and the digestion mode adopted by the solid sample or the liquid sample is only water bath heating or microwave heating at present, because the instability of mercury is determined, the two digestion modes are time-consuming and labor-consuming, and the operation is inconvenient.
4) The invention can provide better technical proposal for the related fields, solves some problems related to folk life, and can accurately measure mercury above 0.01PPb, which is not available for instruments such as atomic fluorescence.
Detailed Description
In the following examples, aqua regia was prepared by mixing 3 volumes of hydrochloric acid with 1 volume of nitric acid.
The preparation method of the 2mg/L gold solution comprises the steps of sucking 1000ug/mL of a commercially available gold standard solution into a 100mL volumetric flask, fixing the volume, shaking uniformly, sucking 10mL of diluent with the concentration of 20ug/mL into the 100mL volumetric flask, fixing the volume, and shaking uniformly.
The preparation method of L-cysteine comprises weighing 100mg L-cysteine, and dissolving in 1000mL water.
The preparation method of the thioglycol comprises the steps of weighing 100mg of the thioglycol and dissolving the thioglycol in 1000mL of water.
Example 1
Firstly, measuring 50mL of a sample, moving the sample into a 250mL beaker, adding 4mL of aqua regia, shaking the sample uniformly, adding 5mL of 2mg/L gold solution, placing the sample on an electric hot plate, controlling the temperature of the electric hot plate at 300 ℃, digesting for 45 minutes, taking down the sample, and slightly cooling the sample;
Step two, adding 5mL of 100mg/L L-cysteine, controlling the temperature of an electric hot plate at 60 ℃, digesting for 15 minutes, taking down after digestion, and cooling to room temperature;
And thirdly, transferring the digestion solution cooled to room temperature to a 50mL volumetric flask, and adding 5mL of 100mg/L of ethylene glycol. Adding secondary distilled water to constant volume to 50mL, shaking uniformly, standing for 10 minutes, and measuring;
Preparing standard series with mercury concentration of 0.00, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 mug/L in sequence into 100mL volumetric flasks, adding 4mg/L gold into each standard series and adding 5mL, wherein the gold content in each standard series is 200 mug/L, and drawing a calibration curve;
Step four, making a full-program blank along with the sample;
and fifthly, measuring the sample by ICP-MS. The mercury concentration of 0.020 mug/L is detected from the calibration curve, and the concentration of the blank sample is measured to be 0.000 mug/L;
The concentration of mercury in the water sample was calculated as follows:
Wherein, C is the concentration of mercury in the water sample, ug/L;
c1-find the concentration of mercury from the standard curve, ug/L;
c2-find the concentration of mercury in the blank sample, ug/L by the standard curve;
v-constant volume at constant volume, mL;
V 0 -the sampling volume of the sample, mL.
The calculated mercury concentration was 0.020ug/L.
Example 2
Measuring 30mL of a sample, using secondary distilled water to fix the volume to 50mL, moving the sample into a 250mL beaker, adding 3mL of aqua regia, shaking the sample uniformly, adding 5mL of 2mg/L gold solution, placing the sample on an electric plate, controlling the temperature of the electric plate at 280 ℃, digesting for 40 minutes, taking down the sample, and slightly cooling the sample;
step two, adding 5mL of 100mg/L L-cysteine, controlling the temperature of an electric hot plate between 70 ℃, digesting for 15 minutes, taking down after digestion is finished, and cooling to room temperature;
transferring the digestion solution cooled to room temperature to a 50mL volumetric flask, adding 5mL of 100mg/L thioglycol, adding secondary distilled water to a volume of 50mL, shaking uniformly, standing for 10 minutes, and measuring;
Preparing standard series with mercury concentration of 0.00, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 mug/L in sequence into 100mL volumetric flasks, adding 4mg/L gold into each standard series and adding 5mL, wherein the gold content in each standard series is 200 mug/L, and drawing a calibration curve;
Step four, making a full-program blank along with the sample;
measuring a sample by ICP-MS, and finding out the mercury concentration of 5.00 mug/L from a calibration curve, wherein the concentration of a blank sample is measured to be 0.002 mug/L;
The concentration of mercury in the water sample was calculated as follows:
Wherein, C is the concentration of mercury in the water sample, ug/L;
c1-find the concentration of mercury from the standard curve, ug/L;
c2-find the concentration of mercury in the blank sample, ug/L by the standard curve;
v-constant volume at constant volume, mL;
V 0 -the sampling volume of the sample, mL;
The calculated mercury concentration was 10.00ug/L.
Example 3
Firstly, measuring 10mL of sample, using secondary distilled water to fix the volume to 50mL, moving to a 250mL beaker, adding 2mL of aqua regia, shaking uniformly, adding 5mL of 2mg/L gold solution, placing on an electric plate, controlling the temperature of the electric plate to 250 ℃, digesting for 30 minutes, taking down, and slightly cooling;
Step two, adding 5mL of 100mg/L L-cysteine, controlling the temperature of an electric hot plate between 80 ℃, digesting for 15 minutes, taking down after digestion is finished, and cooling to room temperature;
transferring the digestion solution cooled to room temperature to a 50mL volumetric flask, adding 5mL of 100mg/L thioglycol, adding secondary distilled water to a volume of 50mL, shaking uniformly, standing for 10 minutes, and measuring;
Preparing standard series with mercury concentration of 0.00, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 mug/L in sequence into 100mL volumetric flasks, adding 4mg/L gold into each standard series and adding 5mL, wherein the gold content in each standard series is 200 mug/L, and drawing a calibration curve;
Step four, making a full-program blank along with the sample;
and fifthly, measuring the sample by ICP-MS. The mercury concentration is 9.85.00 mug/L from the calibration curve, and the concentration of the blank sample is measured to be 0.002 mug/L;
The concentration of mercury in the water sample was calculated as follows:
Wherein, C is the concentration of mercury in the water sample, ug/L;
c1-find the concentration of mercury from the standard curve, ug/L;
c2-find the concentration of mercury in the blank sample, ug/L by the standard curve;
v-constant volume at constant volume, mL;
V 0 -the sampling volume of the sample, mL.
The calculated mercury concentration was 49.2ug/L.
The invention is further illustrated by the following experimental examples.
Experimental example 1A standard GSB07-3173-2014202051 was measured at a standard value of 11.2.+ -. 1.3.
Measuring 25mL of sample, using secondary distilled water to fix the volume to 50mL, moving to a 250mL beaker, adding 2mL of aqua regia, shaking uniformly, adding 5mL of 2mg/L gold solution, placing on an electric plate, controlling the temperature of the electric plate to 280 ℃, digesting for 45 minutes, taking down, and slightly cooling;
Step two, adding 5mL of 100mg/L L-cysteine, controlling the temperature of an electric hot plate between 80 ℃, digesting for 15 minutes, taking down after digestion is finished, and cooling to room temperature;
transferring the digestion solution cooled to room temperature to a 50mL volumetric flask, adding 5mL of 100mg/L thioglycol, adding secondary distilled water to a volume of 50mL, shaking uniformly, standing for 10 minutes, and measuring;
Preparing standard series with mercury concentration of 0.00, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 mug/L in sequence into 100mL volumetric flasks, adding 4mg/L gold into each standard series and adding 5mL, wherein the gold content in each standard series is 200 mug/L, and drawing a calibration curve;
Step four, making a full-program blank along with the sample;
Measuring a sample by ICP-MS, and finding out the mercury concentration of 5.63 mug/L from a calibration curve, wherein the concentration of a blank sample is measured to be 0.00 mug/L;
The concentration of mercury in the water sample was calculated as follows:
Wherein, C is the concentration of mercury in the water sample, ug/L;
c1-find the concentration of mercury from the standard curve, ug/L;
c2-find the concentration of mercury in the blank sample, ug/L by the standard curve;
v-constant volume at constant volume, mL;
V 0 -the sampling volume of the sample, mL.
The calculated mercury concentration was 11.30ug/L.
Experimental example 2 the standard GSB07-3173-2014202052 was measured at a standard value of 3.73.+ -. 0.54.
Firstly, measuring 50mL of a sample, moving the sample into a 250mL beaker, adding 3mL of aqua regia, shaking the sample uniformly, adding 5mL of 2mg/L of gold solution, placing the sample on an electric hot plate, controlling the temperature of the electric hot plate to be 280 ℃, digesting for 35 minutes, taking down the sample, and slightly cooling the sample;
Step two, adding 5mL of 100mg/L L-cysteine, controlling the temperature of an electric hot plate between 60 ℃, digesting for 15 minutes, taking down after digestion is finished, and cooling to room temperature;
transferring the digestion solution cooled to room temperature to a 50mL volumetric flask, adding 5mL of 100mg/L thioglycol, adding secondary distilled water to a volume of 50mL, shaking uniformly, standing for 10 minutes, and measuring;
Preparing standard series with mercury concentration of 0.00, 1.00, 2.00, 4.00, 6.00, 8.00 and 10.00 mug/L in sequence into 100mL volumetric flasks, adding 4mg/L gold into each standard series and adding 5mL, wherein the gold content in each standard series is 200 mug/L, and drawing a calibration curve;
Step four, making a full-program blank along with the sample;
measuring a sample by ICP-MS, and finding the mercury concentration of 3.73 mug/L from a calibration curve, wherein the concentration of a blank sample is measured to be 0.002 mug/L;
The concentration of mercury in the water sample was calculated as follows:
Wherein, C is the concentration of mercury in the water sample, ug/L;
c1-find the concentration of mercury from the standard curve, ug/L;
c2-find the concentration of mercury in the blank sample, ug/L by the standard curve;
v-constant volume at constant volume, mL;
V 0 -the sampling volume of the sample, mL.
The calculated mercury concentration was 3.73ug/L.
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| CN110726605A (en) * | 2019-09-30 | 2020-01-24 | 温州科技职业学院 | Determination method for simultaneously detecting arsenic and mercury in soil by using double-channel atomic fluorescence spectrophotometer |
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| CN110057791A (en) * | 2019-02-25 | 2019-07-26 | 滕亚君 | The measuring method of arsenic, mercury, bismuth, lead, cadmium content in a kind of eucalyptus oil |
| CN110726605A (en) * | 2019-09-30 | 2020-01-24 | 温州科技职业学院 | Determination method for simultaneously detecting arsenic and mercury in soil by using double-channel atomic fluorescence spectrophotometer |
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