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Vapor headspace enrichment detection method for trace amount of volatile organic pollutants in seawater

A volatile organic and detection method technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that trace compounds are difficult to meet the requirements of qualitative identification, easily produce water vapor interference, and the equipment is expensive, so as to prevent interference, Low detection limit and good reproducibility

Active Publication Date: 2014-09-24
MARINE FISHERIES RES INST OF ZHEJIANG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although its limit of quantification has reached a low level, the trace compounds obtained by this method are usually difficult to meet the requirements of qualitative identification, which requires higher enrichment of water samples
The purge and trap method is prone to water vapor interference during purging, the operation is more complicated, the equipment is expensive, and the analysis cost is high
Static headspace extraction has unique advantages in the analysis of volatile organic compounds in water, such as direct injection of samples without pretreatment, less use of toxic organic solvents, fast, simple, high sensitivity, and short analysis time, but the main problems still remain is a higher detection limit

Method used

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  • Vapor headspace enrichment detection method for trace amount of volatile organic pollutants in seawater
  • Vapor headspace enrichment detection method for trace amount of volatile organic pollutants in seawater
  • Vapor headspace enrichment detection method for trace amount of volatile organic pollutants in seawater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1 Detection of Vapor Enrichment Headspace Gas Chromatography of Trace Chlorobenzenes Organic Pollutants in Seawater

[0025] exist figure 1 The device shown in the figure completes the secondary enrichment and condensation process of the water sample, and the specific operation method is as follows:

[0026] ⑴Water sample collection and storage: Water samples are stored in brown ground glass bottles and sealed with tetrafluoroethylene. After samples are collected, they are stored in an incubator with ice packs and brought back to the laboratory for storage in a water sample storage room at 4°C. , the detection is completed within 7 days;

[0027] (2) The first enrichment and condensation: 1L of water sample is added to the sample evaporating flask (2L flask), the water sample is heated by an electric furnace at 200°C and steam distilled, so that the volatile components are released together with water vapor at the same time, after condensation, the second time ...

Embodiment 2

[0034] Example 2 Detection of Vapor Enrichment Headspace Gas Chromatography of Trace Benzene Series Organic Pollutants in Seawater

[0035] ⑴Water sample collection and storage: Water samples are stored in brown ground glass bottles and sealed with tetrafluoroethylene. After samples are collected, they are stored in an incubator with ice packs and brought back to the laboratory for storage in a water sample storage room at 4°C. , the detection is completed within 7 days;

[0036] (2) The first enrichment and condensation: 1L water sample is added to a 2L sample evaporating flask, and the water sample is heated by an electric furnace at 200°C and steam distilled, so that volatile components and water vapor are simultaneously released and condensed, and the second evaporating flask (250mL Place 1ml of water in advance as the absorption liquid in the flask), recover the condensate to the secondary evaporation bottle, and stop collecting the condensate when it reaches 150mL;

[0...

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Abstract

The invention relates to a headspace gas chromatography detection technology, particularly discloses a vapor headspace enrichment detection method for a trace amount of volatile organic pollutants in seawater, and belongs to the technical field of water environment detection. The method sequentially comprises the four steps of water sample collection and storage, primary enrichment condensation, secondary enrichment condensation and headspace gas chromatography detection. According to the method, water vapor is used as sweeping gas, water is used as an absorbent, a water sample is secondarily distilled and condensed, and the condensed sample is enriched for headspace gas chromatography detection; a vapor headspace enrichment method is adopted, so that the using amount of an organic solvent in a process of enriching the volatile organic pollutants in the seawater is effectively reduced, and the interference of other components to a target object is prevented; an extraction process of the enrichment method is simple and convenient, the introduction of other solvents is avoided, the method is environment-friendly, low in limit of detection and high in recovery rate and reproducibility, and the requirements of detection of a trace amount of volatile organic pollutants in the seawater can be met.

Description

technical field [0001] The invention relates to a headspace gas chromatography detection technology, in particular to a steam headspace enrichment detection method for trace volatile organic pollutants in seawater, and belongs to the technical field of water environment detection. Background technique [0002] In recent years, with the gradual improvement of analytical techniques, the detection of trace volatile organic compounds has been paid more and more attention by analytical scientists. For the analysis of trace VOCs, pretreatment technology is very critical. The pretreatment methods mainly include liquid-liquid extraction (LLE), direct injection (DAI), solid phase extraction (SPE), solid phase microextraction (SPME), membrane extraction (ME), headspace technology (HS), etc. The direct water sampling technique is only suitable for relatively clean water samples with less organic matter, and a guard column needs to be installed between the injection port and the chroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08
Inventor 孙秀梅金衍健钟志胡红美郭远明
Owner MARINE FISHERIES RES INST OF ZHEJIANG
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