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Method for determining dissolving state and adsorption state of Cd (II) in mineral soil

A determination method and adsorption state technology, applied in the field of determining the occurrence form of heavy metal Cd in mineral soils, can solve the problems of rare studies on comprehensive form models of soil systems

Inactive Publication Date: 2014-09-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above studies all focus on a single component in the soil, and there are few studies on the comprehensive morphology model of the soil system.

Method used

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  • Method for determining dissolving state and adsorption state of Cd (II) in mineral soil
  • Method for determining dissolving state and adsorption state of Cd (II) in mineral soil
  • Method for determining dissolving state and adsorption state of Cd (II) in mineral soil

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Embodiment 1

[0097] Embodiment 1: the present invention will be further described below by embodiment:

[0098] Using the above method, three representative soils in my country: red soil in Jiangxi, yellow brown soil in Nanjing and black soil in Heilongjiang were selected as the research objects. First, take Jiangxi red soil as an example:

[0099] Step 1: Separating soil clay minerals, determining the CEC value and specific surface area S of the minerals s .

[0100] Soil clay is extracted according to the following steps:

[0101] 1) Removal of carbonate

[0102] Method: Weigh 20g of air-dried soil passed through a 2mm sieve into a 250ml centrifuge tube, add 120ml of 1M sodium acetate / acetic acid (pH value 5) buffer solution, shake overnight on a shaker, then centrifuge at 7500rpm for 20 minutes, and pour off the supernatant .

[0103] 2) Removal of iron oxides

[0104] Method: Add 50ml of 0.28M sodium citrate and 0.1M sodium bicarbonate buffer solution to the above centrifuged sam...

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Abstract

The invention discloses a method for determining the dissolved state and adsorption state of Cd(II) in mineral soil, and belongs to the field of soil analysis. The steps are: separate soil clay minerals, determine the CEC value and specific surface area Ss of the minerals, determine the acid-base constant values ​​logK(+), logK(-), and logK(Na,H) on the surface of the clay minerals, and determine the acid-base constants on the surface of the clay minerals. Metal surface complexation reaction constants logK(AlOCd) and logK(X2Cd) were used to determine the weight percentage content of organic matter, iron oxides, and clay particles in the soil, and a whole soil model was constructed. The invention solves the problem that the form of heavy metal Cd in soil cannot be predicted, creates a method for determining the concentration of Cd form in the soil system, and can be used to predict the concentration of effective Cd in mineral soil.

Description

technical field [0001] The present invention relates to a method for determining the occurrence form of heavy metal Cd(II) in mineral soil, specifically, a method based on the steady state equilibrium model of chemical substances in aqueous solution and the complexation model on the solid surface of soil Chemical Equilibrium Determination Methods. Background technique [0002] The "speciation" of metals in soil refers to the various occurrence types of heavy metals in soil. The migration and transformation of heavy metal elements in soil and their toxicity to plants and the degree of impact on the environment are not only related to the total content of heavy metals in the soil, but also have a lot to do with the existing forms of metal elements in the soil. [0003] Metals exist in various forms in soil. Some forms are soluble, and some forms are inert, such as the part bound in the mineral crystal lattice. The inert form has little effect on its bioavailability or ecoto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24G01N27/42
Inventor 顾雪元孙剑赵艳萍王晓蓉
Owner NANJING UNIV
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