Method for analyzing contents of three different occurrence forms of organic pollutants in soil

A technology of organic pollutants and analysis methods, applied in the field of analysis of the content of three different forms of organic pollutants in soil, can solve the problems of unscientific soil pollution, and achieve the solution of unscientific soil pollution and good application value Effect

Active Publication Date: 2016-05-04
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the total concentration of organic pollutants is generally used at home and abroad to evaluate the degree of soil pollution is not scientific enough, the present invention adopts the pretreatment method of Tenax resin adsorption-organic solvent extraction-alkali-thermal hydrolysis and re-extraction of organic solvent for graded extraction. Using gas chromatography, gas chromatography-mass spectrometry, liquid chromatography and liquid chromatography-mass spectrometry to establish an analysis method for the content of three different forms of organic pollutants in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Determination of soluble, adsorbed and bound BDE-47 content in polluted soil of an electronic waste disposal site

[0019] 1) Extraction of dissolved BDE-47: Weigh 5 grams of contaminated soil samples and place them in a 250 mL Erlenmeyer flask with a stopper, add 0.5 g of Tenax-TA resin, 1 mL of HgCl solution with a concentration of 1000 mg / L and 100 mL of deionized water, and then On shaking for 24 hours. After shaking, the Tenax-TA resin was separated and washed with water, and then 15 mL of n-hexane / dichloromethane (1:1, v / v) was ultrasonically extracted for 15 minutes, and the extraction was repeated 3 times. The extract was concentrated on a rotary evaporator and concentrated to 10 mL, then blown to nearly dryness with nitrogen gas, and finally adjusted to 0.2 mL with n-hexane for testing.

[0020] 2) Extraction and purification of adsorbed BDE-47: the soil samples after extracting dissolved BDE-47 were dried in an oven at 40°C, placed in a 250 mL Erle...

Embodiment 2

[0024] Example 2: Determination of soluble, adsorbed and bound PCB-209 content in a polluted farmland soil

[0025] 1) Extraction of dissolved PCB-209: Weigh 10 grams of contaminated soil samples and place them in a 250 mL corked Erlenmeyer flask, add 0.4 g of Tenax-TA resin, 1 mL of HgCl with a concentration of 1000 mg / L 2solution and 150 mL of deionized water, then shake on a shaker for 16 hours. After shaking, the Tenax-TA resin was separated and washed with water, and then 15 mL of n-hexane / dichloromethane (1:2, v / v) was ultrasonically extracted for 10 minutes, and the extraction was repeated 3 times. The extract was concentrated on a rotary evaporator and concentrated to 10 mL, then blown to nearly dryness with nitrogen gas, and finally adjusted to 0.1 mL with n-hexane for testing.

[0026] 2) Extraction and purification of adsorbed PCB-209: the soil sample after extracting dissolved PCB-209 was dried in an oven at 35 °C, placed in a 250 mL Erlenmeyer flask with a stoppe...

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PUM

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Abstract

The invention relates to a soil contaminant detection method in the field of environment analysis, specifically to a method for analyzing the contents of three different occurrence forms of organic pollutants in soil. Directed at the problem that conventional methods which usually evaluate the contamination degree of soil on the basis of the total concentration of organic pollutants is not scientific enough, the method provided by the invention employs a pretreatment method consisting of Tenax resin adsorption, extraction with an organic solvent, alkaline and thermal hydrolysis and re-extraction with the organic solvent for graded extraction and cooperatively uses gas chromatography, combined gas chromatography and mass spectrometry, liquid chromatography and liquid chromatographic-gas chromatographic apparatus detection and analysis technology, so the contents of three different occurrence forms, including a soluble form, an adsorption form and a bound form, of organic pollutants in soil are detected. The method provided by the invention can accurately and quantitatively analyze the contents of the three different occurrence forms of organic pollutants in soil and has good application value in soil contamination risk evaluation and pollution abatement and restoration.

Description

technical field [0001] The invention relates to a method for analyzing and detecting soil organic pollutants, in particular to an analysis method applicable to the contents of three different occurrence forms of organic pollutants in soil. Background technique [0002] Organic pollutants (HydrophobicOrganicContaminants) is a general term for a class of organic pollutants with a higher octanol / water partition coefficient (Kow). Due to the low water solubility and strong characteristics, organic pollutants are easily adsorbed in soil particles after entering the environment, so soil is the main gathering place for organic pollutants entering the environment. Due to their relatively stable physical and chemical properties, most organic pollutants are difficult to degrade naturally in soil or sediment, and their environmental half-life can be as long as several months or even decades. Most organic pollutants also show high fat solubility, can be enriched in the fat of biologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/062
Inventor 谢显传程宇吉晓文
Owner NANJING UNIV
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