痕量砷流动注射在线还原氢化物发生原子吸收测定  

Determination of Trace Amount of Arsenic by Flow-Injection Hydride Generation Atomic Absorp-tion Spectrometry Witk Online Reduction

作　　者：徐淑坤[1] 方肇伦[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《分析试验室》1994年第2期20-22,共3页Chinese Journal of Analysis Laboratory

摘　　要：方法采用流动注射停流技术使水及土壤浸出液中Ａｓ（Ⅴ）在线还原为Ａｓ（Ⅲ），不经手工还原，用氢化物发生原子吸收光谱法直接测定砷的含量。含４ｍｏｌ／ＬＨＣｌ的样品溶液与３０％碘化钾溶液在编结式反应器中混合，并在采样环中停流４０ｓ，达完全还原后注入到载流中与硼氢化钠反应，采样速度５５次／ｈ，检出限（３σ）０．１μｇ／Ｌ对自来水和土壤浸出液的加标回收结果满意。low-injection stop-flow technique was used toreduce As(Ⅴ)to As(Ⅲ)for thedirect determina-tion of total arsenic without manual prereduction.The sample solution in 4mol/L HCl was merged with300g/L KI solution in 1mol/L HCl and mixed with itin a knotted reactor and stored in sampling loop of400μL for 40s for complete reduction of As(Ⅴ)be-fore the injection of the sample,The detection limit(3σ)of 0.1μg/L As was obtained with a samplingfrequency of 55/h.The precision for the determina-tion of 10μg/L As was 1.2%RSD(n=11).The re-coveries in tap water and soil extracts by spikingstandard solutions of arsenic were satisfiactorv

关 键 词：氢化物 砷 水 土壤 FE HGAAS 

分 类 号：O613.63[理学—无机化学]