分光光度法测定相纸、定影液中的银

Spectrophotometric determination of silver in printing paper and fixer

研究了在 ０．１～０．４ｍｏｌ／Ｌ ＫＯＨ介质中，用高碘酸钾（作为显色剂）与银反应生成黄色络合物，摩尔吸光系数ε＝１．６９×１０~４Ｌ／ｍｏｌ^(－１)ｃｍ^(－１)，最大吸收波长为３６５ｎｍ，银的含量在０～８．０ｍｇ／Ｌ（符合比尔定律），从而建立了一种新的分光光度法，应用到相纸、定影液中银的测定，结果令人满意。

A new method for determinig silver in printing paper and fixer by spectrophotometry is described. The silver reacted with potassium periodate in 0.1 ~ 0.4mol/L potassium bydroxide to form a yellow complex with the apparent molar absorptivity being 1.69L·.mol^-1·cm^-1. The maximum absorption wavelength was at 365nm. Beer's law was obeyed in the range of 0 ~ 8.0mg/L. The experimental results are satisfactory.