On-line purge and trap gas chromatography for monitoring of trihalomethanes in drinking water distribution systems

被引：23

作者：

Brown, Michael A. ^{[1
]}

Miller, Sarah ^{[1
]}

Emmert, Gary L. ^{[1
]}

机构：

[1] Univ Memphis, Dept Chem, Memphis, TN 38152 USA

来源：

ANALYTICA CHIMICA ACTA | 2007年 / 592卷 / 02期

基金：

美国国家科学基金会;

关键词：

trihalomethanes; drinking water; on-line monitoring; gas chromatography; disinfection by-products;

D O I：

10.1016/j.aca.2007.04.020

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A method using an automated on-line purge and trap gas chromatograph with a dry electrolytic conductivity detector (DELCD) has been developed for monitoring four regulated trihalomethanes in drinking water distribution systems. This analyzer samples trihalomethanes from drinking water by pervaporation through a silicone capillary membrane contained within a gas extraction cell (GEC) followed by preconcentration using an adsorbent trap. Trihalomethanes are subsequently desorbed from the trap onto a capillary column, separated and detected. The analyzer operates in real-time, samples directly from the drinking water distribution system and is fully automated. The optimization, operation, and evaluation of the analyzer and method are discussed. Method detection limits (MDL) are less than 1.0 mu g L-1 with acceptable estimates for accuracy, and precision. The results from two on-line monitoring studies in chlorinated and chloraminated distribution systems are presented. The performance of the method is compared directly to United Stated Environmental Protection Agency Method 502.2 and shows a very slight, but acceptable bias. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：154 / 161

页数：8

共 43 条

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