Sun Y C, Mierzwa J, Yang M H
Institute of Nuclear Science, National Tsing-Hua University, Kuang-Fu Rd., 30 043 Hsinchu, Taiwan.
Talanta. 1997 Aug;44(8):1379-87. doi: 10.1016/s0039-9140(96)02197-2.
A new method of efficient rotating gold-film glassy-carbon electrode preparation prior to the determination of As(III) and As(V) in seawater by anodic stripping voltammetry (ASV) is described. Factors affecting sensitivity and precision including pH, deposition time and potential, rotation and scan rate, and the nature of working electrode were investigated. Electroinactive As(V) was reduced to As(III) by gaseous SO(2) prior to ASV determination. For a deposition time of 4 min the determination limit was approximately 0.19 ppb. Precision of the proposed method was very good (RSD=2-0.6% at 1-5 ppb) and a relatively good accuracy determined by analysis of certified reference seawater (CASS-1) and seawater samples spiked with an arsenic standard solution, was also obtained.
本文描述了一种在通过阳极溶出伏安法（ASV）测定海水中的As(III)和As(V)之前，高效制备旋转金膜玻碳电极的新方法。研究了影响灵敏度和精密度的因素，包括pH值、沉积时间和电位、旋转和扫描速率以及工作电极的性质。在ASV测定之前，通过气态SO(2)将电惰性的As(V)还原为As(III)。对于4分钟的沉积时间，测定限约为0.19 ppb。所提出方法的精密度非常好（在1 - 5 ppb时相对标准偏差为2 - 0.6%），并且通过分析有证标准海水（CASS - 1）和加标砷标准溶液的海水样品，也获得了相对较好的准确度。
