Chuanuwatanakul Suchada, Dungchai Wijitar, Chailapakul Orawon, Motomizu Shoji
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.
Anal Sci. 2008 May;24(5):589-94. doi: 10.2116/analsci.24.589.
A sequential injection-square-wave anodic stripping voltammetry (SIA-SWASV) is proposed for the simultaneous determination of Pb(II), Cd(II) and Zn(II), employing an in situ plated bismuth film screen-printed carbon electrode (Bi-SPCE) as a working electrode and hydrochloric acid as a supporting electrolyte. Bi(III) and analyte metal ions were on-line deposited onto a SPCE at -1.4 V vs. Ag/AgCl for 180 s. At a stopped flow, a square-wave voltammogram was recorded from -1.3 to 0 V vs. Ag/AgCl. The experimental conditions were optimized. Under the optimum conditions, the linear ranges were 0 - 70 microg L(-1) for Pb(II) and Cd(II), and 75 - 200 microg L(-1) for Zn(II). The limits of detection (S/N = 3) were obtained at concentrations as low as 0.89 microg L(-1) for Pb(II) and 0.69 microg L(-1) for Cd(II) for a 180-s deposition time. The proposed method was applied to the determination of Pb(II), Cd(II) and Zn(II) in water samples with satisfactory results.
提出了一种顺序注射-方波阳极溶出伏安法（SIA-SWASV），用于同时测定Pb（II）、Cd（II）和Zn（II），采用原位镀铋膜丝网印刷碳电极（Bi-SPCE）作为工作电极，盐酸作为支持电解质。Bi（III）和分析物金属离子在相对于Ag/AgCl为-1.4 V的电位下于SPCE上在线沉积180 s。在停流条件下，记录相对于Ag/AgCl从-1.3至0 V的方波伏安图。对实验条件进行了优化。在最佳条件下，Pb（II）和Cd（II）的线性范围为0 - 70 μg L⁻¹，Zn（II）的线性范围为75 - 200 μg L⁻¹。对于180 s的沉积时间，Pb（II）的检测限（S/N = 3）低至0.89 μg L⁻¹，Cd（II）的检测限为0.69 μg L⁻¹。所提出的方法应用于水样中Pb（II）、Cd（II）和Zn（II）的测定，结果令人满意。
