CN113340829A - Method for detecting heavy metal in glass beads for pavement markings - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000011324 bead Substances 0.000 title claims abstract description 37
- 239000011521 glass Substances 0.000 title claims abstract description 37
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 26
- 239000000243 solution Substances 0.000 claims abstract description 55
- 230000029087 digestion Effects 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 239000002253 acid Substances 0.000 claims abstract description 18
- 238000000120 microwave digestion Methods 0.000 claims abstract description 17
- 239000012490 blank solution Substances 0.000 claims abstract description 13
- 238000001277 hydride generation atomic absorption spectroscopy Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 16
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 10
- 239000012279 sodium borohydride Substances 0.000 claims description 9
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 5
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 abstract description 23
- 229910052785 arsenic Inorganic materials 0.000 abstract description 22
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052787 antimony Inorganic materials 0.000 abstract description 21
- 238000005259 measurement Methods 0.000 abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910002804 graphite Inorganic materials 0.000 abstract description 5
- 239000010439 graphite Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 13
- 238000002835 absorbance Methods 0.000 description 12
- 235000011167 hydrochloric acid Nutrition 0.000 description 11
- 229910021642 ultra pure water Inorganic materials 0.000 description 9
- 239000012498 ultrapure water Substances 0.000 description 9
- 238000005406 washing Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 2
- 229910000074 antimony hydride Inorganic materials 0.000 description 2
- 229910000070 arsenic hydride Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012488 sample solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- RBFQJDQYXXHULB-UHFFFAOYSA-N arsane Chemical compound [AsH3] RBFQJDQYXXHULB-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000705 flame atomic absorption spectrometry Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
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- 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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Abstract
The invention discloses a method for detecting heavy metals in glass beads for pavement markings, and belongs to the field of heavy metal detection. The detection method comprises the following steps: step 1, placing glass beads and acid in a microwave digestion system for digestion to obtain digestion liquid; step 2, performing acid-dispelling treatment on the digestion solution to obtain a solution to be detected; and 3, detecting the solution to be detected and the blank solution by adopting a hydride generation atomic absorption spectrometry. The method utilizes microwave digestion to carry out sample pretreatment, uses a graphite furnace electric hot plate acid-driving method to carry out measurement pretreatment, uses a hydride generation atomic absorption spectrometry to measure the arsenic and the antimony in the glass beads for the pavement marking, has simple operation method, greatly improves the detection efficiency, greatly improves the detection precision, and has the relative standard deviation of the content statistics of the heavy metals of arsenic and antimony in the glass beads of only 1.5 percent. The invention is not easy to generate harmful substances in the detection process, prevents environmental pollution and is environment-friendly.
Description
Technical Field
The invention relates to the field of heavy metal detection, in particular to a method for detecting heavy metals in glass beads for pavement markings.
Background
With the continuous acceleration of the socialization process of energy conservation and emission reduction, the requirements of people on environmental protection are higher and higher, and the requirements on heavy metal detection are stricter and stricter. The glass beads for the pavement marking contain a plurality of heavy metals, and the heavy metals with severe toxicity hazards such as arsenic and antimony are also contained. When heavy metals arsenic and antimony in glass beads are detected in the prior art, the phenomena of overlarge errors or low detection efficiency generally exist no matter a flame atomic absorption spectrometry method, an inductive coupling plasma method or other heavy metal detection methods, and the problem of mutual conflict between the detection efficiency and the detection precision is always difficult to solve.
How to simultaneously improve the detection efficiency and the detection precision when detecting heavy metals of arsenic and antimony is a technical problem to be solved urgently by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a method for detecting heavy metals in glass beads for pavement markings, which aims to solve the problems in the prior art, improve the detection efficiency of heavy metals arsenic and antimony in the glass beads for pavement markings and improve the detection precision.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a method for detecting heavy metals in glass beads for pavement markings, which comprises the following steps:
step 1, placing glass beads and acid in a microwave digestion system for digestion to obtain digestion liquid;
step 3, detecting the solution to be detected and the blank solution by using a hydride generation atomic absorption spectrometry;
the blank solution is not added with glass beads in the preparation process, and the rest is the same as the preparation method of the solution to be detected.
Further, hydrogen peroxide is added in the digestion in the step 1; the acid in step 1 comprises nitric acid and hydrofluoric acid.
Further, the digestion in the step 1 is specifically as follows: firstly heating, heating from room temperature to 210 ℃ within 5min, keeping for 40min, then cooling, and cooling to 50 ℃ within 20 min.
Further, the temperature of acid expelling is 160 ℃, and the acid expelling is stopped when no white smoke is emitted.
Further, the step 2 of adding a potassium iodide solution and fixing the volume by using hydrochloric acid is also included after the acid is removed.
Further, the lamp current of the hydride generation atomic absorption spectrometry in step 3 is 9A or 13A, and the number of pixel points is 9 or 13.
Further, in the step 3, sodium borohydride and hydrochloric acid are added in the detection process, wherein the concentration of the sodium borohydride is 20g/L, and the mass percentage of the hydrochloric acid is 7%.
The invention discloses the following technical effects:
the method utilizes microwave digestion to carry out sample pretreatment, uses a graphite furnace electric hot plate acid-driving method to carry out measurement pretreatment, uses a hydride generation atomic absorption spectrometry to measure the arsenic and the antimony in the glass beads, has simple operation method, greatly improves the detection efficiency, greatly improves the detection precision, and only has the relative standard deviation of the statistics of the contents of the heavy metals arsenic and antimony in the glass beads for the pavement marking of 1.5 percent.
The invention is not easy to generate harmful substances in the detection process, prevents environmental pollution and is environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a diagram illustrating the influence of the lamp current and the pixel point number on the absorbance in the arsenic measurement in embodiment 2 of the present invention;
fig. 2 is a diagram showing the influence of lamp current and pixel point number on absorbance in antimony measurement in embodiment 3 of the present invention.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
Example 1 screening of optimal assay Process parameters
Preparation of solutions to be tested
Step 1, adding 0.2g of glass beads for road markings, 5-6mL of 68% concentrated nitric acid, 5-6mL of 40% hydrofluoric acid and 2mL of 30% hydrogen peroxide into a microwave digestion tank, shaking up, and standing for 15 min; and then placing the digestion tank in a microwave digestion system, arranging a heating system, heating from room temperature to 210 ℃ within 5min, keeping for 40min, arranging a cooling system, cooling to 50 ℃ within 20min, cooling for 10min, then opening the microwave digestion system, and standing the microwave digestion tank in a fume hood for 20min, and opening to obtain a digestion solution.
Preparation of a blank solution
The difference from the preparation of the solution to be tested is that the addition of glass beads for pavement marking in step 1 is omitted.
Detection by hydride generation atomic absorption spectrometry
Taking 4-6mL of blank solution (without adding glass beads for a pavement marking) and 4-6mL of solution to be detected, analyzing the change of absorbance under different lamp currents of 7, 9, 10, 12 and 13A and different pixel points of 3, 5, 7, 9, 11 and 13, and finding out the existing interaction; analyzing the change of the absorbance under the conditions of the atomization temperature of 900, 925, 950, 975 and 1000 ℃ and the gas flow rate of 0, 6, 25 and 35NL/h and finding the interaction existing in the change; preparing sodium borohydride solutions with different concentrations of 10g/L, 12g/L, 15g/L, 18g/L and 20g/L and hydrochloric acids with different mass fractions of 1%, 3%, 5%, 7% and 9%, analyzing the absorbance change of samples to be detected under the conditions of different concentrations of sodium borohydride and different concentrations of hydrochloric acids (sodium borohydride reacts with hydrochloric acid to generate nascent hydrogen, trivalent arsenic and antimony are reduced to gaseous arsenic hydride and stibine by the nascent hydrogen, arsenic hydride and stibine are loaded into a quartz atomizer by excessive hydrogen and carrier gas (argon), are decomposed to atomic arsenic and atomic antimony after being heated, so that the elements to be detected are atomized, under the irradiation of a light source, ground state arsenic atoms and antimony atoms are excited to high energy states, the absorption of characteristic spectral lines of atoms is generated, the absorbance is in direct proportion to the content of arsenic and antimony in a certain concentration range), finding interactions for which there is; the arsenic and antimony concentrations were obtained by plotting a standard curve and the accuracy of the method was analyzed by the normalized recovery and relative standard deviation.
The influence of the number of pixels-the lamp current on the absorbance of arsenic (As) element is shown in table 1, and the influence of the number of pixels-the lamp current on the absorbance of antimony (Sb) element is shown in table 2.
TABLE 1 Effect of number of pixels-Lamp Current on Absorbance of As element
TABLE 2 influence of number of pixels-Lamp Current on the Absorbance of Sb elements
Example 2 detection of arsenic in glass beads
Preparation of solutions to be tested
Step 1, adding 0.2g of glass beads for pavement markings, 5mL of 68% concentrated nitric acid, 6mL of 40% hydrofluoric acid and 2mL of 30% hydrogen peroxide into a microwave digestion tank, shaking up, standing for 15min, then placing the digestion tank into a microwave digestion system, arranging a heating system, heating from room temperature to 210 ℃ within 5min, keeping for 40min, arranging a cooling system, cooling to 50 ℃ within 20min, cooling for 10min, then opening the microwave digestion system, and standing the microwave digestion tank in a ventilation cabinet for 20min and opening to obtain a digestion solution.
Preparation of a blank solution
The difference from the preparation of the solution to be tested is that the addition of glass beads for pavement marking in step 1 is omitted.
Detection by hydride generation atomic absorption spectrometry
6mL of blank solution (without adding glass beads for a pavement marking) and 6mL of solution to be detected are taken, 20g/L of sodium borohydride solution is taken as a reducing agent, and the absorbance is measured under the conditions of a lamp current 13A, the number of pixel points 13, an atomization temperature of 950 ℃, a gas flow rate of 6NL/h and hydrochloric acid with the mass fraction of 7%.
The arsenic concentration was obtained by plotting a standard curve and the accuracy of the method was analyzed by the recovery of spiked and relative standard deviation.
As a result: in this embodiment, the detection limit of arsenic is 0.1 μ g/L, and the specific calculation method is as follows: the blank solution was measured 11 times in succession and the detection limit for the optimized method was determined by dividing the 3-fold standard deviation of the blank solution by the slope of the standard curve.
The arsenic normalized recovery rate of the embodiment is 96-105%, and the relative standard deviation is 1.64%.
The arsenic standard recovery rate and relative standard deviation are calculated as follows:
the standard adding recovery rate refers to the ratio of the result obtained by adding quantitative standard substance into the sample matrix without the measured substance and analyzing according to the sample processing steps to the theoretical value. Namely:
P＝(C2×V2－C1×V1)/C3×V3×100％.
in the formula:
p-is the recovery rate of the added standard;
c1-is the sample concentration, i.e., the sample measurement;
c2-is the concentration of the spiked sample, i.e., the value determined by the spiked sample;
c2-is a scalar quantity.
V1 — sample volume;
v2-is the spiked sample volume;
v3-is the scaled volume.
Relative Standard Deviation (SD)
In the formula:
s-standard deviation (also denoted as SD). in actual measurement, if the standard deviation is used, the degree of precision of the detection result can be reflected.
The arsenic content statistics in the examples are shown in table 3.
The calculation formula of As content in the sample is As follows:
in the formula:
x is the element content in the sample, and the unit is mg/kg;
c is the content of elements in the sample solution, and the unit is mu g/mL;
c0-element content in reagent blank, unit is mug/mL;
v is the volume of the sample solution with constant volume, and the unit is mL;
m is sample weighing, and the unit is g;
the statistics of arsenic content in this example are shown in table 3.
Example 3 detection of antimony in glass beads
Preparation of solutions to be tested
Step 1, adding 0.2g of glass beads for pavement markings, 6mL of 68% concentrated nitric acid, 5mL of 40% hydrofluoric acid and 2mL of 30% hydrogen peroxide into a microwave digestion tank, shaking up, standing for 15min, then placing the digestion tank into a microwave digestion system, arranging a heating system, heating from room temperature to 210 ℃ within 5min, keeping for 40min, arranging a cooling system, cooling to 50 ℃ within 20min, cooling for 10min, then opening the microwave digestion system, and standing the microwave digestion tank in a ventilation cabinet for 20min and opening to obtain a digestion solution.
Preparation of a blank solution
The difference from the preparation of the solution to be tested is that the addition of glass beads for pavement marking in step 1 is omitted.
Detection by hydride generation atomic absorption spectrometry
6mL of blank solution (without adding glass beads for road markings) and 6mL of solution to be tested were taken, 20g/L of sodium borohydride solution was used as a reducing agent, and the absorbance was measured under the conditions of a lamp current of 9A, the number of pixel points of 9, an atomization temperature of 900 ℃, a gas flow rate of 6NL/h, and a mass fraction of 7% of hydrochloric acid.
Antimony concentrations were obtained by plotting a standard curve and the accuracy of the method was analyzed by the recovery of spiked and relative standard deviation.
As a result: the detection limit of antimony in this example reaches 0.13. mu.g/L (the detection method is the same as that in example 2);
the recovery rate of antimony normalized in this example is between 96% and 105%, and the relative standard deviation is 1.33% (calculated in the same manner as in example 2);
the statistics of the antimony content in this example are shown in Table 3 (the antimony content is calculated in the same manner as in example 2).
TABLE 3 statistical table of As and Sb content in glass beads
As can be seen from the relative standard deviation values in the table, the relative standard deviation value of the invention is basically controlled below 3%, and the average deviation value is only 1.5%, which shows that the precision of the detection of the invention is very high. Moreover, the detection efficiency of the invention is very high as can be seen from the whole test process.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. The method for detecting the heavy metal in the glass beads for the pavement markings is characterized by comprising the following steps of:
step 1, placing glass beads and acid in a microwave digestion system for digestion to obtain digestion liquid;
step 2, performing acid-dispelling treatment on the digestion solution to obtain a solution to be detected;
step 3, detecting the solution to be detected and the blank solution by using a hydride generation atomic absorption spectrometry;
step 4, obtaining the heavy metal concentration by drawing a standard curve, and analyzing the accuracy of the method through the standard recovery rate and the relative standard deviation;
the blank solution is not added with glass beads in the preparation process, and the rest is the same as the preparation method of the solution to be detected.
2. The method for detecting the heavy metal in the glass beads for the pavement marking according to claim 1, wherein hydrogen peroxide is added in the digestion in the step 1; the acid in step 1 comprises nitric acid and hydrofluoric acid.
3. The method for detecting the heavy metal in the glass beads for the pavement marking according to claim 1, wherein the digestion in the step 1 is specifically as follows: firstly heating, heating from room temperature to 210 ℃ within 5min, keeping for 40min, then cooling, and cooling to 50 ℃ within 20 min.
4. The method for detecting heavy metals in glass beads for road markings according to claim 1, wherein the acid-expelling temperature is 160 ℃ and acid-expelling is stopped when no white smoke is emitted.
5. The method for detecting the heavy metals in the glass beads for the pavement marking according to claim 1, wherein the step 2 further comprises the steps of adding a potassium iodide solution and fixing the volume by using hydrochloric acid after the acid removal is finished.
6. The method for detecting heavy metals in glass beads for road markings according to claim 1, wherein the lamp current of the hydride generation atomic absorption spectrometry in step 3 is 9A or 13A, and the number of pixels is 9 or 13.
7. The method for detecting the heavy metal in the glass beads for the pavement marking according to claim 1, wherein sodium borohydride and hydrochloric acid are added in the detection process in the step 3, wherein the concentration of the sodium borohydride is 20g/L, and the mass percent of the hydrochloric acid is 7%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114739926A (en) * | 2022-04-08 | 2022-07-12 | 新疆维吾尔自治区产品质量监督检验研究院 | Method for measuring residual quantity of harmful heavy metals in printing ink |
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| CN104297174A (en) * | 2013-07-18 | 2015-01-21 | 上海威正测试技术有限公司 | Method for rapid detection of mercury content in water |
| CN104749120A (en) * | 2015-03-23 | 2015-07-01 | 广东出入境检验检疫局检验检疫技术中心 | Method for measuring content of arsenic in edible oil by utilizing super-microwave digestion graphite furnace atomic absorption spectrometry |
| CN106370510A (en) * | 2016-10-21 | 2017-02-01 | 天津大学 | Method for microwave digestion of glass body |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104297174A (en) * | 2013-07-18 | 2015-01-21 | 上海威正测试技术有限公司 | Method for rapid detection of mercury content in water |
| CN104749120A (en) * | 2015-03-23 | 2015-07-01 | 广东出入境检验检疫局检验检疫技术中心 | Method for measuring content of arsenic in edible oil by utilizing super-microwave digestion graphite furnace atomic absorption spectrometry |
| CN106370510A (en) * | 2016-10-21 | 2017-02-01 | 天津大学 | Method for microwave digestion of glass body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739926A (en) * | 2022-04-08 | 2022-07-12 | 新疆维吾尔自治区产品质量监督检验研究院 | Method for measuring residual quantity of harmful heavy metals in printing ink |
| CN114739926B (en) * | 2022-04-08 | 2022-11-22 | 新疆维吾尔自治区产品质量监督检验研究院 | Method for measuring residual quantity of harmful heavy metals in printing ink |
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