吸附溶出伏安法测定植物叶片中痕量砷及其在茶汤中的形态分析  

Determination of Trace Arsenic and its Speciation Analysis in Plant Leaves by Adsorption Stripping Voltammetry (?)

作　　者：范华钧 施文赵 李翱[1] 蔡乾涛 

机构地区：[1]华中理工大学化学系

出　　处：《分析试验室》1993年第2期25-28,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金

摘　　要：稀盐酸介质中,砷(Ⅲ)与吡咯烷二硫甲酸铵(APDC)形成的配合物在悬汞电极上有良好的吸附溶出行为,据此建立了测定痕量砷的吸附溶出伏安新方法。其二次导数峰电位为-0.53V(vs.SCE),测定范围:1.3×10^(-9)～2.7×10^(-7)mol/L,检出限达1.3×10^(-10)mol/L。曾用本法测定蕃茄叶和茶汤中痕量砷,结果满意。并采用巯基棉柱及其它方法分离、测定了茶叶、茶汤中砷的各种主要形态及其分布。The adsorptive stripping voltammetric behaviour of arsenic(Ⅲ)-pyrrolidinedithiocarbamate complex has been studied in this paper. A new simple, sensitive and selective method for the determination of trace arsenic has been established. There is a good linear relationship between the second differential peak height and the concentration of As(Ⅲ) in the range of 1.3～10^(-5)mol/L～2.7×10^(-7) mol/L, and the detection limit is 1.3×10^(-10)mol/L. Several biological materials (standard samples) and the arsenic speciation in tea has been determined by this method after separation and preconcentration by sulfhydryled cotton fiber (SCF). The recoveries of arsenic were in the range of 90.5% to 108%.

关 键 词：砷 吸附 溶出伏安法 茶叶 

分 类 号：TS272.7[农业科学—茶叶生产加工]