Simultaneous detection of nitrogen-containing aromatic disinfection by-products in drinking water-six kinds of chlorophenylacetonitriles

Abstract

The invention provides a method for simultaneously detecting nitrogen-containing aromatic disinfection by-products in drinking water - 6 kinds of chlorophenylacetonitriles, comprising: sample pretreatment, analysis condition optimization and operation measurement, sample pretreatment includes pH value and Determination of chlorination terminator; optimization of analysis conditions including determination of column oven temperature rise program, column head pressure, injection volume, injection port temperature and chromatographic identification time zone; operation determination including determination of standard curve, method detection limit and recovery rate ; The present invention provides the new train of thought that simultaneously detects nitrogen-containing aromaticity disinfection by-product-6 kinds of chlorophenylacetonitriles, is different from the method for single-time detection of single disinfection by-product in the prior art, greatly improves analysis efficiency, thereby for a variety of The simultaneous determination of aromatic disinfection by-products has laid a foundation; in addition, the present invention uses GC / MS coupled instrument to avoid phenomenon such as peak tailing, guarantees normal peak and shortens analysis time, thereby obtains higher method detection limit and a small relative standard deviation.

Description

technical field [0001] The invention belongs to the technical field of municipal water supply and drainage and environmental engineering, and relates to water quality detection and analysis technology, in particular to a method for simultaneously detecting six kinds of chlorophenylacetonitriles, which are nitrogen-containing aromatic disinfection by-products in drinking water. Background technique [0002] The drinking water disinfection process achieves the purpose of ensuring the safety of drinking water by inactivating pathogenic bacteria, but at the same time, it also produces a series of disinfection by-products, which pose a threat to people's health [1]. Epidemiological studies have pointed out that long-term drinking of chlorinated water may lead to an increase in the prevalence of bladder cancer [2]. However, researchers did not identify disinfection by-products that contribute to bladder cancer pathogenesis [3]. In addition, epidemiological studies have shown that...

AI Technical Summary

Problems solved by technology

So far, there are few systematic detection technologies for multiple nitrogen-containing aromatic disinfection by-products in drinking water at the same time in China. Chlorophenylacetonitrile is a new type of nitrogen-containing aromatic disinfection by-products. It has not been reported, therefore, establishing a convenient, effective and rapid detection method is very important for the detection and control research of the 6 chlorophenylacetonitriles

In addition, the detection of most disinfection by-products uses gas chromatography-electron capture detectors, relying on the retention time comparison of standard substances for qualitative analysis. Although qualitative and quantitative analysis can be done well, the intermediate products produced in the chlorination reaction are not Without the ability to distinguish, it is not convenient to carry out research on the formation mechanism of disinfection by-products

Images