原子荧光法测定水中As(Ⅲ)和As(Ⅴ)的研究  

Determination of As(Ⅲ) and As(Ⅴ) in water by atomic fluorescence spectroscope

作　　者：马越[1] 陈玉琢[1] 刘志滨[1] 吴维[1] 

机构地区：[1]天津市自来水集团有限公司,天津300040

出　　处：《供水技术》2011年第2期45-47,共3页Water Technology

摘　　要：采用原子荧光法对饮用水中的砷进行检测和形态分析，探讨了水浴时间、还原剂硫脲一抗坏血酸加入量、水样pH等对测量结果的影响。结果表明，水浴温度为50℃左右，加入1g硫脲和1g抗坏血酸，反应10min即可将100mL水样中10μg/L的As（V）还原为As（Ⅲ），还原率在95％以上；水样pH值在3．0～9．0，该方法均能有效屏蔽As（V），回收率为92．2％～99．6％，7次检测的相对标准偏差为2．4％。The detection and morphology analysis were conducted for arsenic in drinking water by atomic fluorescence spectroscope. The effects on detection by water bath time, dosage of reducing agent thiourea - ascorbic acid and pH were discussed . The results showed that 10 p,g/L As （ V ） in water sample was reduced to As （ Ⅲ ） under dosing 1 g thiourea and 1 g aseorbie acid with a reaction time of 10 rain when water bath temperature was at 50 ℃, and the reduction rate was more than 95%. This method could effectively shield As （ V ） at pH of 3.0 to 9.0. The recovery rate was 92.2% to 99.6% , which the relative standard deviation for seven detections was 2.4%.

关 键 词：砷还原 原子荧光法 还原剂 屏蔽 

分 类 号：TU991[建筑科学—市政工程]