摘要
本文研究结果表明,在HNO_3介质中,铋(Ⅲ)—碘化钾—罗丹明B—阿拉伯胶—Triton X—100体系的灵敏度比文献报导的铋碘配阴离子—罗丹明B—聚乙烯醇(或明胶)体系方法提高了3～4倍,摩尔吸光系数ε=4.6X10^5l.mol^(-1).cm^(-1)。该法具有稳定性好,较易掌握等优点。用本法测定纯铜、氧化铜、高纯氧化镍和铜合金中微量铋,结果令人满意。
A new sensitive colour display method for trace Bi determination is described. The maximum absorption wave length of association complex ion is at 590nm and the apparent molar absorptivity is 4. 6X 1051· mol-1 · cm-1 at 590nm. Beer's Low is obeyed for Bi in the range of 0-10μg/25ml. In order to eliminate the influence of interfering ions contained in the matrix metal, sulfhydrylaed cotton is adopted. The method can be used to determine trace Bi in pure copper, copper oxide, high purity nickel oxide and copper alloys. The relative standard deviation is less than 5% and the recovery rates are between 95% and 104% for ten determinations.
