铍－三溴偶氮氯膦络合吸附波的极谱研究及应用

Studies on the Polarographic Complex Adsorption Wave of Beryllium with Tribromo-chlorophonazo and lts Applications

铍在ｐＨ８．５的ＮＨ＿４Ｃｌ－ＮＨ＿８·Ｈ＿２Ｏ溶液中，形成一良好的导数极谱波，峰电位ＥＰ＝－０．４２（Ｖ＿（ｖｓ）．ＳＣＥ），峰电流与Ｂｅ￣（２＋）的浓度在２．０×１Ｏ￣（－８）～２．０×１０￣（－６）ｍｏｌ／Ｌ 范围内呈线性关系，检出限为１．０×１０￣（－８）ｍｏｌ／Ｌ。用循环伏安法等电化学手段研究了极谱波的性质及其机理，实验表明为结合吸附波，本法直接用于矿石中痕量铍的测定，结果较好。

In a solutin of pH8.5 NH_4Cl-NH_3·H_2O，a sensitive complex adsorption wave of the Be^(2＋)-TB-CPA by single sweep polarography is observed. The peak potential of the wave is -0.42V(vs.SCE). The linear relationship holds between current and Be concntration ranging from 2×vestigated. The method has been applied to determine trace Be in the rock,with good results.