摘要
本文介绍在ＫＮＯ＿３－ＶＣ－ＥＤＴＡ－ＴｒｉｔｏｎＸ－１００混合底液中，用悬汞电极２．５次微分阴极溶出伏安法测定痕量碘的方法及其最佳条件。引入表面活性剂ＴｒｉｔｏｎＸ－１００可显著提高灵敏度，Ｉ￣－的检测下限达０．１ｎｇ·ｍＬ￣（－１）（电积１８０ｓ）；引入ＶＣ可提高Ｉ￣－的稳定性（抗氧化性）；ＥＤＴＡ和ＶＣ有效地提高了方法的抗干扰能力。用于饮水中痕量碘的分析，其相对标准偏差为３．３％（ｎ＝７），回收率为９３％～１０２％，结果满意。
his paper presents a method for the determinationof trace iodide and its optimum deterrnining conditions ina mixed medium composed of KNO_3,VC,EDTA andTriton X-100 by 2.5order differential cathodic strippingvoltammetry with hanging mercury dropelectrede(HMDE),Triton X-100 increased markedly the sensitivi-ty of iodide.Its detection limit is 0.1ng/mL(preconcen-trating time,180s).VC improved the stability of I￣- insol ution and together with EDTA increased the anti-inter-ference ability of the methed effectively.The methed wassuccessfully used to analyse trace iodide in drinking waterwith a relative standard deviation of 3.3%(n=7) and arecovery of 92～102%。
出处
《分析试验室》
CAS
CSCD
北大核心
1994年第1期67-69,共3页
Chinese Journal of Analysis Laboratory
关键词
碘
阴极溶出
伏安法
饮用水
增敏
Iedide
eathedic stripping voltammetry
drinking water
surfactant
