A method for detecting organic pollutants by combining molecular imprinted solid phase extraction technology-potential method

A technology of organic pollutants and molecular imprinting, applied in the preparation of test samples, measuring devices, and analysis materials, etc., can solve the problems of low organic pollutant content, large sample matrix effect, and inability to directly detect organic pollutants. Achieve simple operation, simplify the sample pretreatment process, and eliminate the effect of sample matrix

Active Publication Date: 2016-08-17
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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Problems solved by technology

However, when polymer membrane ion-selective electrodes are applied to the detection of trace organic pollutants in complex environmental samples, due to the extremely low content of organic pollutants in environmental samples and the large sample matrix effect, such electrodes cannot be used to detect complex organic pollutants. Direct potentiometric detection of organic pollutants in environmental samples

Method used

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  • A method for detecting organic pollutants by combining molecular imprinted solid phase extraction technology-potential method
  • A method for detecting organic pollutants by combining molecular imprinted solid phase extraction technology-potential method
  • A method for detecting organic pollutants by combining molecular imprinted solid phase extraction technology-potential method

Examples

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Effect test

Embodiment 1

[0030] Take the detection of the organic pollutant molecule chlorpyrifos in seawater as an example. The specific detection steps are as follows:

[0031] 1. Preparation of chlorpyrifos molecularly imprinted solid-phase extraction filler:

[0032] Mix 2.7mM chlorpyrifos and 10.7mM methacrylic acid and let it stand for 1 hour, add 75.2mM ethylene glycol dimethacrylate, 40mL acetonitrile, 1.2mM azobisisobutyronitrile, ultrasonic 5-10min to make it evenly mixed, and then add to The mixture was sealed after passing nitrogen gas for 10 minutes, and polymerized in a constant temperature oil bath at 75° C. for 24 hours to obtain a white blocky polymer. The white blocky polymer was vacuum-dried at constant temperature at 45°C for 24 hours, ground and sieved, and the particles above 300 mesh were extracted and eluted by methanol or acetonitrile until the eluate had no absorption at λ=228.7nm in the ultraviolet absorption spectrum. The chlorpyrifos molecularly imprinted polymer is obta...

Embodiment 2

[0043] Take the detection of benzo(a)pyrene pollutants in tap water by the present invention as an example.

[0044] Take tap water to configure two spiked samples, the concentration is 1×10 -9 mol / l and 2.5×10 -9 mol / l, according to the steps 1, 2, 3 and 4 in Example 1 to measure the potential change rate signal, refer to the standard working curve, and compare the sample signal in tap water with the standard working curve to obtain benzo(a)pyrene pollution in tap water substance concentration.

Embodiment 3

[0046] Take the detection of benzo(a)pyrene pollutants in seawater by the present invention as an example.

[0047] Get the seawater sample filtered by 0.45 micron glass fiber membrane in advance, measure the potential change rate signal according to the steps 1, 2, 3 and 4 of Example 1, refer to the standard working curve, and compare the signal of the sample in seawater with the standard working curve to obtain Concentrations of benzo(a)pyrene pollutants in seawater.

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Abstract

The invention relates to a method for detecting organic pollutants, and particularly relates to a method for detecting the organic pollutants through combination of a molecular imprinting solid-phase extraction technology and a potential method. An organic pollutant molecular imprinting polymer is taken as solid-phase extraction filler to concentrate and separate the organic pollutants in a sample, and then organic pollutant molecular imprinting polymer film ion selective electrodes are used for potential detection of the concentrated organic pollutants, thus the potential detection of the organic pollutants in a complex sample is realized. By adopting the molecular imprinting solid-phase extraction technology, the method disclosed by the invention eliminates a complex sample matrix effect which influences the potential detection, the accuracy of the potential detection is effectively increased, and the application range of the potential detection method is widened.

Description

technical field [0001] The invention relates to a method for detecting organic pollutants, in particular to a method for detecting organic pollutants by combining molecular imprinted solid-phase extraction technology and potential method. Background technique [0002] Polymer sensitive membrane ion-selective electrode is an important branch of chemical sensors. Its research began in the 1960s. Its detection principle is based on the relationship between the response potential of the sensitive membrane and the ion activity of the analyte in accordance with Nernst. equation. This type of electrode has been widely used in environmental monitoring, clinical testing, food analysis and other fields due to its superior performance such as simple operation, convenient portability, and continuous and rapid detection of analytes. However, when polymer membrane ion-selective electrodes are applied to the detection of trace organic pollutants in complex environmental samples, due to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/333G01N1/28
Inventor 秦伟黎四霞梁荣宁姚瑞清
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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