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Qualitative screening method of semi-volatile halogenated organic pollutants in sediments

An organic pollutant, semi-volatile technology, applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as difficult to achieve qualitative identification and quantitative analysis, and achieve the effect of simple sample processing

Inactive Publication Date: 2014-12-24
SHANGHAI UNIV
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Problems solved by technology

Traditional one-dimensional gas chromatography mass spectrometry (GCMS) is difficult to separate these trace pollutants from complex sample matrices in full scan mode, and it is difficult to achieve qualitative identification and quantitative analysis

Method used

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  • Qualitative screening method of semi-volatile halogenated organic pollutants in sediments
  • Qualitative screening method of semi-volatile halogenated organic pollutants in sediments
  • Qualitative screening method of semi-volatile halogenated organic pollutants in sediments

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Embodiment 1

[0029] Example 1: Qualitative screening of semi-volatile halogenated organic pollutants in Liaohe sediments

[0030] In this implementation case, the steps and process of the assay method are as follows:

[0031] 1. Sample preparation

[0032] Get 5 grams of dried deposits, place them in a 500-milliliter extraction device, and perform continuous Soxhlet extraction for 72 hours at 60 degrees Celsius. The extraction solvent is a mixed solution of 400 milliliters of n-hexane and acetone with a volume ratio of 1:1. Concentrate to 1 mL. Purify with an established chromatographic column. Use 70 ml volume ratio of 1:1 mixed solution of n-hexane and dichloromethane to rinse the chromatography column, control the flow rate at 2-4 ml / min, collect the eluate in a heart bottle and concentrate to about 1 ml, Concentrate further with nitrogen blowing.

[0033] 2. Comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry detection

[0034]After the a...

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Abstract

The invention belongs to the field of environment monitoring methods and particularly relates to a qualitative screening method of semi-volatile halogenated organic pollutants in sediments. The purpose of screening the semi-volatile halogenated organic pollutants in a sample is realized through composite silica gel purification and measurement of a comprehensive 2-dimensional gas chromatography combination flight time mass analyzer. The method comprises the following steps: (1) carrying out Soxhlet extraction and composite silica gel purification on a sediment sample to obtain a sample; (2) optimizing the parameters of the comprehensive 2-dimensional gas chromatography combination flight time mass analyzer and establishing a chromatography spectrum library of different halogenated compounds; (3) performing comprehensive 2-dimensional gas chromatography combination flight time analysis after the extracted sediment sample is concentrated; (4) deeply analyzing obtained experiment data and qualitatively and non-qualitatively screening the types of the main halogenated organic pollutants in the sediments. According to the screening method, the preparation-treatment of the sample is simple; combination analysis of a target compound and a non-target compound can be realized with one-time sample feed and reference can be provided for investigating and tracing pollution sources.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, in particular to a qualitative screening method for semi-volatile halogenated organic pollutants in sediments. Background technique [0002] Halogenated organic pollutants refer to a class of organic compounds containing F, Cl, Br, and I functional groups in their molecules, including aliphatic halogenated compounds and aromatic halides, which are widely used in chemical raw materials, intermediates, flame retardants, organic Solvents, food additives, pesticides and pharmaceuticals, etc. These compounds have outstanding "three causes" toxicity, environmental persistence, and bioaccumulation, and are extremely harmful to human health. They have always been key pollutants controlled by countries around the world. With the continuous deepening of people's understanding of the environmental persistence and bioaccumulation of halogenated organic pollutants and their potential harm to...

Claims

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Application Information

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IPC IPC(8): G01N30/88G01N30/06
Inventor 张东平季雯鹿建霞陈征任国发
Owner SHANGHAI UNIV
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