硒(Ⅳ)的示波极谱测定  

OSCILLOPOLAROGRAPHIC DETERMINATION OF SELENIUM(Ⅳ)

作　　者：李敏[1] 张克荣[1] 

机构地区：[1]四川大学华西公共卫生学院,成都610041

出　　处：《理化检验（化学分册）》2004年第3期153-154,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在0.2mol·L-1的甲酸 甲酸钠缓冲液(pH3.5)中,硒(Ⅳ)于-0.70V(vs.SCE)处有一灵敏的极谱波。在1×10-5～0.5g·L-1范围内峰电流与其浓度呈线性关系,检出限为1×10-6g·L-1,加标回收率为95.0%～114.5%,相对标准偏差为4.44%～7.39%。方法适于试样中微量硒的测定。In a 0.2mol·L^(-1) acetate buffer medium of pH 3.5, selenium(Ⅳ) gives a sensitive polarographic wave at -0.70V (vs. SCE). The peak currents (i_p) keep a linear relationship with the concentrations of Se(Ⅳ) in the range of 1×10^(-5)～0.5g of Se(Ⅳ) perliter. Detection limit of this method attained to a value of 1×10^(-6)g·L^(-1), and recoveries obtained were in the range of 95.0%～114.5%. Precision tests carried out in the concentrations within the working curve gave values of RSD in the range of 4.44%～7.39%. This method has been satisfactorily applied to the analysis of some practical samples containing microamounts of selenium.

关 键 词：硒(Ⅳ) 示波极谱法 含量测定 甲酸-甲酸钠缓冲液 

分 类 号：O613.52[理学—无机化学] O657.14[理学—化学]