Method for analyzing trace organic substance in water using on-line combined solid phase extraction and liquid chromatography

A technology of liquid chromatography and solid phase extraction column, which is applied in the field of online combined solid phase extraction pretreatment and high performance liquid chromatography analysis, to achieve the effect of reducing the detection limit of the method, improving sensitivity and avoiding cumbersome operations

Inactive Publication Date: 2006-09-06
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SPME is only suitable for the analysis of volatile and semi-volatile organic compounds, and it is powerless for the less volatile organic compounds that occupy nearly 2 / 3 of the organic species.

Method used

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  • Method for analyzing trace organic substance in water using on-line combined solid phase extraction and liquid chromatography
  • Method for analyzing trace organic substance in water using on-line combined solid phase extraction and liquid chromatography
  • Method for analyzing trace organic substance in water using on-line combined solid phase extraction and liquid chromatography

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Embodiment 1

[0031] The present invention only needs to add a high-pressure infusion pump 2, a new six-way valve 3, a solid-phase extraction column 4 and stainless steel connecting pipes in front of the general liquid chromatography. The specific connection method is shown in Figure 2.

[0032] The six ports A, B, C, D, E, and F of the newly added six-way valve 3 are respectively connected to the high-pressure infusion pump 2, the enriched waste liquid, the inlet port of the analysis column 5, the liquid phase six-way valve 7 and the solid phase extraction column 4 ends. Among them, the interface A is connected to the high-pressure infusion pump 2, which is used to transport the activated solvent and the water sample 1 to be tested; Waste liquid; ports C and F are connected to both ends of the solid phase extraction column 4; port D is connected to the inlet port of the analytical column 5 for online elution and separation; port E is connected to the E' port of the liquid phase six-way va...

Embodiment 2

[0036] Using the device of the present invention to sample and analyze low-molecular-weight polycyclic aromatic hydrocarbons in a surface water in Shanghai, the basic properties of the surface water are: water temperature 23.2°C, turbidity 80NTU, pH 7.85, TOC 7.80mg·L -1 , DOC 6.89mg·L -1 . The specific operation steps are as follows: first use the high-pressure infusion pump 2 to inject 5 mL·min -1 The flow rate sends 10mL acetonitrile and 10mL pure water to activate the solid phase extraction column 4 in sequence; -1 Add 25mL of the surface water sample 1 filtered by a 0.45μm membrane at a flow rate; then wash with 5mL pure water at the same flow rate; finally, switch the newly added six-way valve 3 and liquid phase six-way valve 7 at the same time, and use the liquid phase mobile phase to transfer the solid The low molecular weight polycyclic aromatic hydrocarbons enriched on the phase extraction column 4 are eluted and enter the analysis column 5 for analysis. Liquid ch...

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Abstract

Wherein, adding a new six-way valve (3), coupling a solid-phase extraction column (4) contained replaceable absorbent, a high-pressure transfer pump (2), and a set of industrial high-effect liquid chromatograph with self-carried liquid phase six-way valve (7) by a stainless steel tube. This invention is fast and high-effective, and has wide application for drinking water, surface water, etc.

Description

technical field [0001] The invention relates to an on-line combined solid-phase extraction pretreatment and high-performance liquid chromatography analysis method to realize the enrichment and analysis of organic matter in samples, belonging to the field of environmental analysis. Background technique [0002] The residual amount of organic pollutants in the environment is very low, often as low as μg / l or even ng / l, which brings difficulties to the detection and research of these trace organic pollutants. The pretreatment process of environmental samples is an important link. It has been reported in the literature that for a complete sample analysis process, the time required for each step accounts for the percentage of the total analysis time: sample collection 6.0%, sample processing 61.0%, analysis and testing 6.0% , data processing and reporting 27.0%. Among them, sample processing takes the longest time, accounting for about two-thirds of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/08G01N30/38
Inventor 陈玲李竺郜洪文唐银健赵建夫
Owner TONGJI UNIV
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