A powerful anodic stripping voltammetry (ASV) was proposed using a bismuth film coated on screen-printed carbon electrode (Bi-SPCE) in conjunction with the Tessier’s sequential extraction procedure for determination of various forms of cadmium and lead in soil. A dynamic flow-through stirred extraction system was employed to simulate the natural percolation of liquid through the solid soil that causes leaching of trace metals. The voltammetric peak currents, linear ranges, and detection limits of the metal ions depend on the type and condition of the extractants. The effect of interferences can be eliminated by acid digestion of the extract, addition of 0.3 mM ferricyanide, and adjustment of the pH. As validated with a certified reference material of sandy loam soil (CRM033), this low-cost ASV with Bi-SPCE system could be used successfully for the analysis of metals in the leachate. The proposed method provided high accuracy and precision with high sensitivity. Analysis time was reduced by one-fourth that of the batch-wise method. The performance of the proposed method was also demonstrated for the fractionation study of a soil sample from a mining area in northern Thailand.

提出了一种强大的阳极溶出伏安法（ASV），该方法使用涂在丝网印刷碳电极（Bi-SPCE）上的铋膜以及Tessier的顺序萃取程序来测定土壤中各种形式的镉和铅。使用动态流通搅拌萃取系统模拟液体通过固体土壤的自然渗透，这会导致微量金属的浸出。金属离子的伏安峰值电流，线性范围和检测极限取决于萃取剂的类型和条件。提取液经酸消化，加入0.3 mM铁氰化物并调节pH值可消除干扰的影响。经砂壤土标准参考材料（CRM033）的验证，带有Bi-SPCE系统的低成本ASV可以成功用于渗滤液中金属的分析。所提出的方法提供了高精度和高灵敏度的精度。分析时间减少了分批方法的四分之一。还证明了所提方法的性能，可用于泰国北部矿区土壤样品的分级研究。