摘要
本文应用EA-1型微机化多功能电化学分析仪和微电极,提出头发中砷的计时电位溶出法测定,并结合流动注射技术实现连续分析。样品采用湿法消化法,经离子交换柱分离干扰离子,以亚硫酸还原砷(V),采用铂丝微电极为工作电极,在硫酸介质中同位镀金,于-0.4V富集,然后以阴极溶出法(PSA)扫描至0 V,即见一尖锐清晰的溶出峰,在0.47～20ppb As浓度范围内与峰高呈良好线性关系,检测限达0.47ppb,与FIA技术联用,可进而提高精密度。
In the present study, microcomputer-based electrochemical analyzer (model EA-1) and microelectrode were applied to establish the PSA method for the determination of As in human hair. After digesting, samples passed ion-exchanging column to seperate interference ions, then H_2SO_3 was used to reduce As(Ⅴ)to As(Ⅲ)which has electrical activity. Plating potentials was-0.4v(VS. SCE), stripping constant current was-0.14μA, analytical calibration curves of As were linear over a range from 0.47 ppb to 20ppb with the detection limit calculated as 0.47ppb. In combination of FIA technique, the determinational precision has been improved obviously.
出处
《环境污染与防治》
CAS
CSSCI
CSCD
北大核心
1992年第1期30-32,4,共4页
Environmental Pollution & Control
