2．5次微分溶出伏安法同时测定水中痕量钴和镍

Simultaneous determination of trace cobalt and nickel in water by 2.5th differential stripping voltammetry

在０．０１ｍｏｌ／ＬＮＨａ·Ｈ２Ｏ＋ＮＨ４Ｃｌ（ｐＨ＝８．９）和２．０×１０－６ｍｏｌ／Ｌ酸性铬兰Ｋ（ＡＣＢＫ）溶液中，钴和镍均产生非常灵敏的还原波，峰电位分别是－０．５２Ｖ和－０．６４Ｖ（８８·ＳＣＥ），峰电流与钻和镍的浓度分别在３．０×１０－８～５．０×１０－７ｍｏｌ／Ｌ和２．０×１０－～４２×１０－７ｍｏｌ／Ｌ范围内成直线关系，该法用于测定水中痕量钴和镍，结果令人满意。

In 0 .01mol/L NH3.H2O+NH4Cl(pH≈8.9) and2.0 ×10-6.mol/L acid chrome blue K (ACBK) solution, two sensitive reduction peaks of Co(Ⅱ) andNi(Ⅱ) were observed. The peak potentials of thewayes are - 0 .52V (vs.SCE) and - 0 .64V, respetivy, the peak currents are linar with concentrations of Co(Ⅱ) and Ni(Ⅱ) in the range of 3.0 ×10-8～5 .0 ×10-7 mol/L and 2. 0×10-8～4.2×10-7mol/L respectively. The method has been used forthe determination of trace co(Ⅱ) and Ni(Ⅱ) inwater with satisfactory results.