Pretreatment method and device for semi-volatile organic compounds in underground water

Abstract

The invention provides a pretreatment method and device for semi-volatile organic compounds in underground water. The device adopted by the method comprises a organic pretreatment device at least comprising three layers of detachable operating tables, wherein the top operating table is used for placing a separating funnel and a positive pressure filtering device, the middle operating table is usedfor placing a drying and purifying device and a concentrating cup, the bottom operating table is used for placing a sample bottle; and based on an extraction flow path formed by the device, n-hexaneand dichloromethane are sequentially used for combined extraction so as to carry out pretreatment on seven to-be-detected substances such as organochlorine pesticide, polycyclic aromatic hydrocarbon,nitrobenzene compounds, total polychlorinated biphenyl, organophosphorus pesticide, chlorothalonil and atrazine in an underground water sample; and therefore, the liquid-liquid extraction operation treatment efficiency and stability in the organic pretreatment process are greatly improved, and meanwhile, the detection precision and sensitivity are improved.

Description

technical field [0001] The invention relates to the technical field of pretreatment of organic matter, in particular to a method and device for pretreatment of semivolatile organic matter in groundwater. Background technique [0002] In the process of organic matter analysis, most of the gas, liquid or solid samples have complex components and exist in the form of multiphase and heterogeneous states. For example, the oil aerosol and floating dust contained in the atmosphere, the emulsion, solid particles and suspended solids contained in the wastewater, the moisture, microorganisms, stones in the soil, etc. Therefore, complex samples must be pre-treated before they can be analyzed and measured. Yes, concentrate the trace components to improve the sensitivity of the method and reduce the detection limit; remove the matrix and other interfering substances in the sample; through derivatization and other reactions, the analyte can be transformed into a substance with higher dete...

AI Technical Summary

Problems solved by technology

[0003] The liquid-liquid extraction method is mainly used for the organic pretreatment process of organochlorine pesticides, polycyclic aromatic hydrocarbons, nitrobenzene compounds, total PCBs, organophosphorus pesticides, chlorothalonil and atrazine. The liquid-liquid extraction process involves a large number of operational steps, including: liquid separation, shaking, pipetting, drying and concentration, etc. The operation process is complicated and prone to errors

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