Method for analyzing N-nitrosamine compounds in drinking water

Abstract

The invention discloses a method for analyzing N-nitrosamine compounds in drinking water. The method comprises the steps that a) sample pretreatment: a water sample of 100 mL is taken and filtered with a 0.45-micron nylon membrane to acquire a pretreated sample; b) solid phase extraction cartridge pretreatment: a solid phase extraction cartridge is rinsed with 10 mL of dichloromethane for the first time, 10 mL of methanol for the second time and 10 mL of distilled water for the third time to acquire a pretreated solid phase extraction cartridge; c) loading: the pre-treated sample is poured into the pretreated solid phase extraction cartridge, and a negative pressure suction method is used to enable the pretreated sample to pass through the pretreated solid phase extraction cartridge untilthe pretreated sample in the pretreated solid phase extraction cartridge is drained to acquire the solid phase extraction cartridge to which a target analyte is adsorbed; d) the analyte is collected;and e) analysis is carried out. According to the invention, the method has the advantages of easy processing and high sensitivity; the linearity is great from 0.5 to 100 mu g / L; a standard solution of0.5 mu g / L is injected continuously for 5 needles; the peak area RSD is less than 2%; and the reproducibility is great.

Description

【Technical field】 [0001] The invention relates to the technical field of water quality detection, in particular to the technical field of an analysis method for N-nitrosamine compounds in drinking water. 【Background technique】 [0002] N-nitrosamines are a class of compounds with the N-N=O structure. Among more than 130 kinds of N-nitrosamine compounds discovered so far, more than 80% are strong carcinogens. In recent years, people have begun to use chloramine instead of chlorine to disinfect drinking water. However, studies have shown that chloramine disinfection produces N-nitrosamines as a by-product. [0003] As early as 1994, N-nitrosodimethylamine was first detected in the drinking water of Lake Ontario, Canada. Subsequently, several nitrosamine compounds such as N-nitrosodiethylamine and N-nitrosodiphenylamine were found in drinking water one after another. In 2005, the U.S. Environmental Protection Agency listed six genotoxic N-nitrosamines as unrestricted pollut...

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But studies have shown that chloramine disinfection produces N-nitrosamines as a by-product

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