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Pretreatment method for determining multiple heavy metal elements in soil simultaneously

A pretreatment and heavy metal technology, applied in the preparation of test samples, etc., can solve the problems of severe reaction in the digestion process, incomplete digestion, large deviation between the test result and the actual value, etc., to reduce the dosage, increase the digestion speed, and reduce the blank value effect

Inactive Publication Date: 2017-08-11
PUER COMPREHENSIVE TECHN TESTING CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] If the pretreatment method of the above three existing patents is used to treat the soil, there will be incomplete digestion, severe reactions during the digestion process, and large deviations between the test results and the actual values.

Method used

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  • Pretreatment method for determining multiple heavy metal elements in soil simultaneously
  • Pretreatment method for determining multiple heavy metal elements in soil simultaneously
  • Pretreatment method for determining multiple heavy metal elements in soil simultaneously

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Sample preparation: Select soil standard materials GBW07423, GBW07428, GBW07448.

[0037] (2) Sample weighing: Weigh 0.15g (accurate to 0.0001g) soil sample, and put the sample into the microwave digestion tube with a polytetrafluoroethylene long-necked funnel. The soil samples on the wall of the funnel all enter the digestion tube;

[0038] (3) Add digestion solution: add 4.5mL nitric acid, 1.5mL hydrochloric acid and 1.5mL hydrofluoric acid to step 2, tighten the lid, and put it into a microwave digestion apparatus for digestion;

[0039] (4) Microwave digestion: set the temperature and time parameters of the microwave digestion program, and carry out microwave digestion to the solution in step (3). The microwave digestion program is shown in Table 1.

[0040] Table 1 Microwave digestion program

[0041] step Power / W Heating time / min temperature / ℃ Constant temperature time / min 1 800 4:00 115 2:00 2 800 4:00 145 4:00 3 800 4...

Embodiment 2

[0050] (1) Sample preparation: Select soil standard materials GBW07423, GBW07428, GBW07448.

[0051] (2) Sample weighing: Weigh 0.20g (accurate to 0.0001g) soil sample, put the sample into the microwave digestion tube with a polytetrafluoroethylene long-necked funnel, and when removing the funnel, tap it gently to make the The soil samples on the wall of the funnel all enter the digestion tube;

[0052] (3) Add digestion solution: add 6mL nitric acid, 2mL hydrochloric acid and 2mL hydrofluoric acid to step 2, tighten the lid, and put it into a microwave digestion apparatus for digestion;

[0053] (4) Microwave digestion: set the temperature and time parameters of the microwave digestion program, and carry out microwave digestion to the solution in step (3). The microwave digestion program is shown in Table 3.

[0054] Table 3 Microwave digestion program

[0055] step Power / W Heating time / min temperature / ℃ Constant temperature time / min 1 1200 5:00 120 ...

Embodiment 3

[0064] (1) Sample preparation: Select soil standard materials GBW07423, GBW07428, GBW07448.

[0065] (2) Sample weighing: Weigh 0.25g (accurate to 0.0001g) soil sample, and put the sample into the microwave digestion tube with a polytetrafluoroethylene long-necked funnel. The soil samples on the wall of the funnel all enter the digestion tube;

[0066] (3) Add digestion solution: add 7.5mL nitric acid, 2.5mL hydrochloric acid and 2.5mL hydrofluoric acid to step 2, tighten the lid, and put it into a microwave digestion apparatus for digestion;

[0067] (4) Microwave digestion: set the temperature and time parameters of the microwave digestion program, and carry out microwave digestion to the solution in step (3). The program of microwave digestion is shown in Table 5.

[0068] Table 5 Microwave digestion program

[0069] step Power / W Heating time / min temperature / ℃ Constant temperature time / min 1 1600 6:00 125 3:00 2 1600 6:00 155 6:00 3 1...

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Abstract

The invention discloses a pretreatment method for determining multiple heavy metal elements in soil simultaneously. The pretreatment method comprises steps as follows: step (1): sample weighing: the soil is air-dried, ground and screened with a nylon sieve, a soil sample is weighed and put into a microwave digestion tube through a polytetrafluoroethylene long-neck funnel, and the funnel is slightly flapped before the funnel is removed so that all the soil sample attached to the wall of the funnel enter the digestion tube; step (2): digestion: nitric acid, hydrochloric acid and hydrofluoric acid are added to the digestion tube, a cover is screwed down, and the digestion tube is put into a microwave digestion instrument for digestion; step (3): acid driving: after microwave digestion is finished, hydrogen peroxide is added to the digestion tube; then the microwave digestion tube is put into a temperature-controlling acid driver in a fume cupboard for direct acid driving until the volume is smaller than 1 mL, then a solution is directly transferred to a volumetric flask, the volume is constant, and a to-be-tested solution is obtained. With the adoption of the pretreatment method, the digestion speed of the sample can be increased, the pre-treatment step of the sample is simplified, and the accuracy of the detection analysis result is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal detection, in particular to a pretreatment method for simultaneously measuring multiple heavy metal elements in soil. Background technique [0002] In recent years, due to factors such as excessive and illegal discharge of industrial "three wastes", random dumping of urban sewage and domestic garbage, sewage irrigation in agricultural production, and unreasonable use of pesticides and chemical fertilizers, heavy metal pollutants have entered agricultural production in various ways. Environment. As the main carrier of agricultural production and an important part of the ecological environment, soil is the substrate for the growth of crops, and its quality directly affects the quality of agricultural products. "Food is the most important thing for the people, and food safety is the first." Food safety is a major issue related to the health of the people. The problem of people's livelihood ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44
CPCG01N1/44
Inventor 陈保刘新月蒲泓君毛静春姜东华罗正刚
Owner PUER COMPREHENSIVE TECHN TESTING CENT
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