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Digestion method of soil metal elements

A metal element and soil technology, which is applied in the field of soil metal element digestion, to simplify steps, improve precision and accuracy, and shorten the time for acid removal

Inactive Publication Date: 2010-01-27
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing digestion methods, the time generally takes 8 to 10 hours

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 0.2000g soil standard sample in the digestion cup;

[0025] (2) preparation mixed acid A: its volume ratio is, nitric acid: hydrofluoric acid: perchloric acid=6: 4: 2; Used nitric acid, hydrofluoric acid, perchloric acid are excellent grade pure reagents;

[0026] (3) preparation mixed acid B: its volume ratio is, hydrofluoric acid: perchloric acid=9: 1; Used hydrofluoric acid, perchloric acid are excellent grade pure reagents;

[0027] (4) Soil decomposition: Add 10ml of mixed acid A into the digestion cup, cover it tightly, and digest it on the electric heating plate in the fume hood at a low temperature of 130-150°C for 0.5h to decompose the soil sample; then medium-high temperature of 150-200 Digest at ℃ until the soil is digested into a clear liquid and no gray-black organic matter adheres to the cup wall. This process takes about 1.5 hours;

[0028] (5) Flying silicon: remove the cover, add 5ml of mixed acid B, fully expose the flying silicon at 140-180...

Embodiment 2

[0033] (1) Weigh 0.5000g soil sample into the digestion cup;

[0034] (2) preparation mixed acid A: its volume ratio is, nitric acid: hydrofluoric acid: perchloric acid=8: 4: 2; Used nitric acid, hydrofluoric acid, perchloric acid are excellent grade pure reagents;

[0035] (3) preparation mixed acid B: its volume ratio is, hydrofluoric acid: perchloric acid=9: 1; Used hydrofluoric acid, perchloric acid are excellent grade pure reagents;

[0036] (4) Soil decomposition: Add 20ml of mixed acid A into the digestion cup, cover it tightly, and digest it on the electric heating plate in the fume hood at a low temperature of 130-150°C for 1 hour to decompose the soil sample; then medium-high temperature of 150-200°C Cook until the soil is digested into a clear liquid and no gray-black organic matter adheres to the cup wall. This process takes about 2 hours;

[0037] (5) Flying silicon: remove the cover, add 15ml of mixed acid B, fully expose the flying silicon at 140-180°C until wh...

Embodiment 3

[0042] (1) Weigh 0.3000g soil sample into the digestion cup;

[0043] (2) preparation mixed acid A: its volume ratio is, nitric acid: hydrofluoric acid: perchloric acid=10: 5: 2; Used nitric acid, hydrofluoric acid, perchloric acid are excellent grade pure reagents;

[0044] (3) preparation mixed acid B: its volume ratio is, hydrofluoric acid: perchloric acid=9: 1; Used hydrofluoric acid, perchloric acid are excellent grade pure reagents;

[0045] (4) Soil decomposition: Add 15ml of mixed acid A into the digestion cup, cover it tightly, and digest it on the electric heating plate in the fume hood at a low temperature of 130-150°C for 0.75h to decompose the soil sample; then medium-high temperature of 150-200 Digest at ℃ until the soil is digested into a clear liquid and no gray-black organic matter adheres to the cup wall. This process is about 3 hours;

[0046] (5) Flying silicon: remove the cover, add 15ml of mixed acid B, fully expose the flying silicon at 140-180°C until ...

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PUM

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Abstract

The invention discloses a digestion method of soil metal elements. The method comprises the following steps: (1) weighing a soil sample; (2) preparing a mixed acid A which has a volume ratio of nitric acid to hydrofluoric acid to perchloric acid of 6-10:4-5:2; (3) preparing a mixed acid B which has a volume ratio of the hydrofluoric acid to perchloric acid of 8-10:1; (4) adding the mixed acid A to a digestion cup to decompose soil; (5) adding the mixed acid B to escape silicon; (6) removing acid: washing off acid globules suspending on the cup wall with 0.2-5% diluted hydrochloric acid or diluted nitric acid, controlling temperature of an electric heating plate at 110-130 DEG C and distilling to dryness; and (7) make constant volume: adding the diluted nitric acid to dissolve residue in the digestion cup, and adding the diluted nitric acid of the same concentration to the fixed volume for measurement. The method has high efficiency and improved safety. The method is applicable to measurement of metal elements such as Cu, Zn, Fe, Mn, Ca, Mg, Ni, Pb, Cd and the like in soil and produces accurate and reliable determination results.

Description

technical field [0001] The invention relates to the determination of metals in soil, especially the digestion method of soil metal elements. Background technique [0002] In the process of environmental monitoring, it is often necessary to measure the metals in the soil. At present, the common method is to use flame atomic absorption spectrophotometry, and the soil samples need to be digested before the measurement. [0003] In the determination process of Cu, Zn, Fe, Mn, Ca, Mg, Ni, Pb, Cd and other metals in soil, the existing digestion method is: weigh 0.2 ~ 0.5g (accurate to 0.0002g) sample in 50ml In the polytetrafluoroethylene crucible, add 10ml of hydrochloric acid (excellent grade) after wetting it with water, and heat it on the electric heating plate in the fume hood at low temperature to make the sample decompose initially. Then add 5ml of nitric acid (premium grade), 5ml of hydrofluoric acid (premium grade), 3ml of perchloric acid (premium grade), cover and heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N21/31
Inventor 卢普相曾晓舵黄赛花
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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