Bedin Karen C, Mitsuyasu Edson Y, Ronix Amanda, Cazetta André L, Pezoti Osvaldo, Almeida Vitor C
Department of Chemistry, State University of Maringá, Av. Colombo 5790, CEP 87020-900 Maringá, PR, Brazil.
Int J Anal Chem. 2018 Oct 8;2018:1473706. doi: 10.1155/2018/1473706. eCollection 2018.
The present work reports the development and application of bismuth-film electrode (BiFE), obtained by in situ method on the pencil-lead graphite surface, for simultaneous Cd(II) and Pb(II) determination at trace levels, as alternative to replace the mercury-film electrodes. Experimental factors, deposition time ( ), deposition potential ( ), and Bi(III) concentration ( ), were investigated by applying a 2 factorial design using 0.10 mol/L acetate buffer solution (pH 4.5) as supporting electrolyte. The analysis conditions of the differential pulse technique were = 250 s, = -1.40 V, and = 250 mg L. The validation of the method employing BiFE was accomplished by determination of merit figures. The detection limits were of 11.0 g L for Cd(II) and 11.5 g L for Pb(II), confirming that proposed method is attractive and suitable for heavy metals determination. Additionally, the BiFE developed was successfully applied for the Cd(II) and Pb(II) determination in wastewater sample of battery industry.
本工作报道了通过原位法在铅笔芯石墨表面获得的铋膜电极（BiFE）的开发与应用，用于痕量水平下同时测定镉（II）和铅（II），作为替代汞膜电极的方法。以0.10 mol/L醋酸盐缓冲溶液（pH 4.5）作为支持电解质，采用二因素设计研究了沉积时间（ ）、沉积电位（ ）和铋（III）浓度（ ）等实验因素。差分脉冲技术的分析条件为 = 250 s， = -1.40 V， = 250 mg L。采用铋膜电极的方法通过测定性能指标进行验证。镉（II）的检测限为11.0 g L，铅（II）的检测限为11.5 g L，证实该方法具有吸引力且适用于重金属测定。此外，所开发的铋膜电极成功应用于电池行业废水样品中镉（II）和铅（II）的测定。
