摘要
基于溴化钾对鲁米诺-过氧化氢-铬（CrⅢ）化学发光反应有较强的敏化作用，结合流动注射技术，建立了溴化钾-鲁米诺-过氧化氢-CrⅢ化学发光体系测定CrⅢ的分析方法。该法测定CrⅢ的线性范围为1×10^-6～1×10^-3mg／mL，检出限为2．06×10^-7mg／mL。对浓度2．0×10^-6mg／mLCrIn标准溶液平行测定11次，相对标准偏差（RSD）为2．39％。利用乙二胺四乙酸二钠（EDTA-2Na）作掩蔽剂，可有效地消除水体Fe^2＋、Fe^3＋、Cu^2＋、Ca^2＋、Zn^2＋等金属离子对测定CrⅢ的干扰，从而快速测定饮用水中CrⅢ的突然变化，达到对饮＋用水重金属突发性污染早期快速预警的目的，应用该方法，CrⅢ检测回收率达到91．7％～97．5％。
Determination of Chromium （CrⅢ） in Drinking Water by Potassium bromide- Luminol-H202 Chemilumi- nescence System with Flow InjectionAbstract ： Based on the obvious sensitization of potassium bromide on the chemiluminescent reaction in the system of luminol-H202 - chromium （CrⅢ）, a sensitive chemiluminescent method for determination of CrⅢ with flow injection technique was developed. The method is simple ,rapid and effective to determine CrIU with the range of （1×10-6 ～ 1 × 10-3） mg/mL and detection limit of 2.06 x 10-7 mg/mL. The relative standard deviation （RSD） is 2.39% for the determination of 2.0 × 10-6 mg/mL of Cr （m） （n = 11 ）. Ethylenediaminetetra acetic acid disodium salt （EDTA-2Na） is effectively eliminated the interference of some metal ions such as Fe2~ , Fe3＋ , Cu2＋ , Znz＋. Therefore, it is a rapid method for determination of CrⅢ sudden changes in drinking water and a good monitor in giving an early alarm in the emergency contamination by heavy metals. The recoverie of CrlU was 91.7% -97.5%.
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2011年第2期172-175,共4页
Food and Fermentation Industries
基金
广东省应急管理2009年第一批研究项目(0815)
关键词
饮用水安全
铬(CrⅢ)
流动注射
化学发光
drinking water safety, chromium（CrⅢ）, flowing injection, chemiluminescence
