摘要
建立了导数吸附计时电势法测定水中痕量铍的方法。采用三电极体系,Be(Ⅱ)和铍试剂Ⅲ形成的络合物,首先通过吸附富集在工作电极上,然后,通以恒电流使之还原,记录时间对电势的一阶导数随电势变化的曲线(dt/dE～E曲线)。Be(Ⅱ)溶液浓度在3.0×10^(-10)～2.0×10^(-7)mol/L范围内与络合物曲线的峰高呈线性关系,方法的检出限为3.0×10^(-10)mol/L。
Derivative adsorption chronopotentiometry determining the trace Be in water is set up. It adopts three- electrode system. The complexes of Be( Ⅱ ) with Beryllon Ⅲ {4 -[(4 -diethylamino -2-hydroxy-phenyl)-azo]-5-hydroxy-naphthalene-2, 7-disurphonic acid} are accumulated on the surface of working electrode by adsorption. The complexes adsorbed are then reduced with a constant current, and the curve of potential vs. the time needed or that of its derivative with respect to potential vs . potential(dt/dE - E curve) is recorded. The peak height of the dt/dE - E curve is a linear relationship to the analytical concentration of Be( Ⅱ ) in the range of 3.0 × 10-10 -2.0×10-7 mol/ L. The detection limit of the method is 3.0 × 10-10 mol/L.
出处
《化学分析计量》
CAS
2001年第4期27-28,共2页
Chemical Analysis And Meterage
