Method for detecting chlorobenzene in sludge through ultrasonic assisted dispersive liquid-liquid microextraction-gas chromatography

Abstract

The invention discloses a method for detecting chlorobenzene in sludge through ultrasonic assisted dispersive liquid-liquid microextraction-gas chromatography. The method comprises the steps of (1) preparation of a standard solution, namely preparing 0.1milligram/ml of standard mixed solution comprising m-dichlorobenzene, o-dichlorobenzene, 1,2,4-trichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4,5-tetrachlorobenzene, and 1,2,3,4-tetrachlorobenzene; (2) ultrasound-assisted extraction, namely putting 1.0g of a sludge sample into a cone centrifuging tube with a turncap, adding acetone, sealing, extracting by ultrasounds, centrifuging extract liquor, then filtering supernate by a microfiltration membrane, and moving into the cone centrifuging tube; (3) dispersive liquid-liquid microextraction; and (4) gas chromatography. The method for detecting the chlorobenzene compounds in the sludge has the high sensitivity. Compared with conventional detection methods such as a soxhlet extraction method, the method saves a large amount of organic solvent being toxic and harmful to human bodies, and little time is used in analysis, so that the method is applicable to the detection on a large quantity of sludge samples.

Description

technical field [0001] The invention relates to the field of detection of environmental pollutants, in particular to an ultrasonic-assisted dispersion liquid-liquid microextraction-gas chromatography method for detecting chlorobenzene in sludge. Background technique [0002] Chlorobenzenes (CBs) are chlorobenzene o-dichlorobenzene, m-dichlorobenzene, p-dichlorobenzene, 1,2,3-trichlorobenzene, 1,2,4-trichlorobenzene, 1,3,5 -Trichlorobenzene, 1,2,3,4,-tetrachlorobenzene, 1,2,3,5-tetrachlorobenzene, 1,2,4,5-tetrachlorobenzene, pentachlorobenzene and hexachlorobenzene In general, it is a colorless oily liquid. They are widely used in the industry as intermediates for the synthesis of organic compounds such as dyes and pesticides, as well as for the manufacture of rubber additives, as well as solvents and heat transfer media. Chlorobenzene has been proven to be carcinogenic, and can inhibit the central nervous system, irritate the eyes and upper respiratory tract, cause skin sc...

AI Technical Summary

Problems solved by technology

Traditional chlorobenzene detection methods include Soxhlet extraction and solid phase extraction, which not only consume a lot of time, but also consume a large amount of organic solvents that are toxic to the human body during the analysis process

In recent years, the development of new detection methods such as headspace liquid phase microextraction and solid phase microextraction, etc., often have complicated operation procedures and require more expensive professional equipment support

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