Method for detecting polychlorinated biphenyl based on magnetic bamboo charcoal disperse substrate solid-phase extraction

Abstract

The invention discloses a method for detecting trace polychlorinated biphenyl in water. The method is a detection method which takes disperse substrate solid-phase extraction as a sample pre-processing technology and uses a gas chromatography-electron capture detector to analyze the polychlorinated biphenyl in water. According to the method disclosed by the invention, magnetic bamboo charcoal which is cheap and easily available is taken as an adsorbent, so that the step of separating the adsorbent from the liquid phase is simplified, and the detection efficiency is improved. The method is simple and convenient, quick, high in sensitivity and reliable, and has detection limit up to 0.02-0.05 mu gL<-1>.

Description

technical field [0001] The invention relates to a detection method for polychlorinated biphenyls in water, in particular to a simple, fast and sensitive method for detecting polychlorinated biphenyls in water. The method uses cheap and easy-to-prepare magnetic bamboo charcoal as an adsorbent to absorb and enrich polychlorinated biphenyls in water, desorbs them with an organic solvent, and detects them with a gas chromatography-electron capture detector. The method of the invention simplifies the separation steps of the adsorbent and the liquid phase, and improves the water sample pretreatment efficiency. technical background [0002] Polychlorinated biphenyls are produced by replacing one or more hydrogen atoms in biphenyl with chlorine atoms. It is a group of compounds with a total of 209 compounds. PCBs have good chemical inertness and non-flammability, and are mainly used as insulators of transformers and capacitors as flame retardants. PCBs are also important chemical ...

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Problems solved by technology

[0005] The present invention aims at the problem that solid-phase extraction of dispersed matrix needs to be centrifuged in the detection process of polychlorinated biphenyls, and the separation between the adsorbent and the liquid phase is not complete. The bamboo charcoal is used to synthesize magnetic bamboo charcoal as the adsorbent, and the permanent magnet is used to completely separate the magnetic bamboo charcoal and the liquid phase. It improves the recovery rate of PCBs and the efficiency of instrument analysis, and provides a simple, fast, sensitive and reliable method for detecting PCBs in water.

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