APP下载

离子色谱法测定水中5种消毒副产物的影响因素分析

2021-03-28廖爽乔茜茜雷静吕警

河南科技 2021年32期

廖爽 乔茜茜 雷静 吕警

摘 要:本研究采用大体积、直接进样的离子色谱法测定对水中5种消毒副产物(DBPs),优化了KOH梯度淋洗的条件,实现了5种DBPs的完全分离及检测。此外,对影响检测结果的各离子间相互作用、水样前处理及水样保存剂进行了分析。结果表明,5种离子线性关系较好,相关系数均大于0.999 0,检出限为0.001~0.003 mg/L,精密度为0.33%~3.57%,准确度试验的相对误差为0.00%~3.00%,结果令人满意。

关键词:离子色谱法;亚氯酸盐;溴酸盐;氯酸盐;二氯乙酸;三氯乙酸

中图分类号:R123.1 文献标识码:A 文章编号:1003-5168(2021)32-0145-03

Analysis of Influencing Factors in the Determination of Five Disinfection By-Products in Water by Ion Chromatography

LIAO Shuang QIAO Qianqian LEI Jing LYU Jing

(1. Xinjiang Changyuan Water Science Research Institute Co., Ltd., Urumqi Xinjiang 830000;2. Quality and Safety Testing Center of Urumqi Agricultural Products, Urumqi Xinjiang 830000)

Abstract: In this study, large-volume, direct-injection ion chromatography is used to analyze the detection methods of five disinfection by-products (DBPs) in water, the conditions of KOH gradient elution are optimized, and the complete separation and detection of five types of DBPs are realized. During the analysis, the interactions between the ions, the pretreatment of water samples and the water sample preservatives that affect the test results are analyzed. The five ions have a good linear relationship, and the correlation coefficients are all greater than 0.999, the detection limit is 0.001~0.003 mg/L, the precision is 0.33%~3.57%, the relative error of the accuracy test is 0.00%~3.00%, and the result is satisfactory.

Keywords: ion chromatography;chlorite;bromate;chlorate;dichloroacetic acid;trichloroacetic acid

水中消毒副产物(DBPs)来源于水的消毒工艺[1],目前已经确认的有600余种,对人体具有很强的潜在致病性[2]。受物化性质影响,该类化合物的分析检测较为困难。目前主要采用的检测方法有气相与气质色谱法[3-4]、液相与液质色谱法[5-6]及离子色谱法[7]等。其中,相比其他检测方法,离子色谱法具有水样前处理简单、不涉及有毒试剂、准确快速的特点。

1 试验部分

1.1 试验仪器和试剂

1.1.1 試验仪器。主要试验仪器有ICS-2100型离子色谱仪、AS-DV型自动进样器、AS19型阴色谱柱、AG19型保护柱、AERS 500型自身再生抑制器、电导检测器、KOH在线淋洗液发生系统和FJY2002-UVF型超纯水仪。其中,FJY2002-UVF型超纯水仪所制备的纯水为电阻率在18.2 MΩ·cm以上的超纯水。

1.1.2 试剂与材料。为减少背景值的干扰,离子色谱仪外加流动相纯水和配制试剂所用的纯水均为超纯水。试验所用的亚氯酸盐、二氯乙酸(DCAA)、三氯乙酸(TCAA)生产厂家为STAER公司,溴酸盐和氯酸盐标液生产厂家为TMRM公司,5种离子浓度均为1 000 mg/L,溶剂均为水。……

登录APP查看全文