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Method for detecting whole copper in soil

A soil and titration technology, applied in the direction of material analysis, special data processing applications, instruments, etc. by observing the influence of chemical indicators, to achieve the effect of easy popularization, good precision and accuracy, and good accuracy

Inactive Publication Date: 2009-04-29
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The only chemical method for determining total copper is the iodometric method, but they are only applicable to the determination of copper content in alloys

Method used

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  • Method for detecting whole copper in soil
  • Method for detecting whole copper in soil
  • Method for detecting whole copper in soil

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Na 2 S 2 o 3 Solution preparation and calibration: weigh 2.6g Na 2 S 2 o 3 ·5H 2 O, dissolved in 100ml freshly boiled condensed distilled water, add 0.02g Na2 CO 3 , stored in a brown bottle, placed in a dark place, and calibrated after 7-10 days;

[0032] Accurately pipet K 2 Cr 2 o 7 Put 10ml of standard solution in a Erlenmeyer flask, add 1ml of 6mol / l HCl solution, 4ml of 10ml KI solution, shake well, put it in a dark cabinet for 5min, add 10ml of water to dilute, and dilute with Na 2 S 2 o 3 When the solution is titrated to light yellow-green, add 5 drops of 0.5% starch indicator, and continue to titrate until the solution changes from blue to bright green, which is the end point;

[0033] Na 2 S 2 o 3 Solution concentration:

[0034] C Na 2 S 2 O 3 = ...

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Abstract

The invention relates to measurement for full copper in soil, in particular to a method for measuring full copper in soil. The method comprises the following steps: counteracting a soil sample by using HCl-HNO3-HF-HClO4; adjusting acidity of the solution by using ammonia water and HAC; adding ammonium hydrogen fluoride to mask iron; controlling pH value of the solution between 3.5 and 4.5; adding excessive KI to act with Cu2+; using starch as indicator of the precipitated I2; and using standard Na2S2O3 solution to titrate. The method has the advantages of good repeatability, and accurate and reliable results.

Description

technical field [0001] The invention relates to the determination of total copper in soil, in particular to an improved determination method for total copper in soil. Background technique [0002] Copper is an essential nutrient element for plants. The soil copper content in my country is 3mg / kg~300mg / kg, most of them are 6mg / kg, and the average content is 22mg / kg. Copper in a few soils like red soil and red soil sometimes exceeds 100mg / kg. Copper in soil is often divided into water-soluble copper, exchangeable copper, acid-soluble copper and insoluble copper. Soil available copper includes water-soluble copper and exchangeable copper, but the content of the former is very small. Exchanged copper refers to the copper ions and copper-containing complex ions adsorbed by soil colloids. Exchangeable copper is mainly adsorbed by the organic part of the soil and is not easily exchanged by other ions, so it must be extracted with strong acid or chelating agent to be released. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G06F19/00
Inventor 周桦宇万太张璐马强
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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