摘要
本文建立了一个测定痕量砷的化学发光分析法。方法的原理是用AgNO_3吸收由样品发生的砷化氢气体,使吸收液中生成的As(Ⅲ)与过量的K_2Cr_2O_7反应生成Cr(Ⅲ)。利用(?)uminol-H_2O_2-Cr(Ⅲ)化学发光体系测定生成的Cr(Ⅲ)以确定样品中砷的含量。方法的检出限是0.4ng/mL As,工作曲线的线性范围是1—0.00lμg/mL As,测定的相对标准偏差小于5%。本方法已用于一些环境水样中痕量砷的测定。结果比较满意。
A method for the determination of traces of arsenic by chemiluminescence analysis was developed. The arsenic in the sample solution was reduced to AsH_3,and then absorbed by AgNO_3 solution. As(Ⅲ) was then determined with luminol-H_2O_2-Cr(Ⅵ) system. The determination range was 1-0.001 μg/ mL and the RSD was less than 5%.The method has been used to determine the trace amounts of arsenic in waters and the results is consistent with those obtained with Ag-DDTC method.
出处
《分析试验室》
CAS
CSCD
北大核心
1990年第2期25-27,共3页
Chinese Journal of Analysis Laboratory
