藉铋-亚硝基R盐-结晶紫反应高灵敏分光光度测定痕量铋

A Sensitive Spectrophotometric Method for the Determination of Trace Bismuth Based on the Bismuth-Nitroso-R Salt-Crystal Violet Reaction

本文提出了一个超高灵敏测定铋的分光光度方法。缔合物的吸收峰位于600um，表观摩尔吸光系数ε600＝3．0×109L·mol’·cm－1，铋浓度在0～200ng／L范围内遵守比耳定律。本法用于水样和合成试样中痕量铋的测定，结果较满意。对缔合物组成与显色机理进行了初步讨论。

A superhigh sensitive spectrophotometric method was developed for the determination of trace bismuth. The ion association complex exhibits maximum absorption at 600nm with an apparent molar absorptivity of 3. 0× 109L - mol 1. cm 1. Beer' s law is obeyedin the range of 0~200 ng/L for Bi3-. The proposed method has been used for the determination of Bi3- in water and synthetic sample with satisfactory results. The composition of association complex and reaction mechanism have been discussed.