双波长β修正理论对银和其络合物化学计量比测定的研究  

Study on Dual-Wavelength Beta-Correction Spectrophotometric Determination of Silver and Its Complexation Ratio

作　　者：周桂云[1] 

机构地区：[1]安徽淮北啤酒厂

出　　处：《光谱实验室》1997年第4期73-77,共5页Chinese Journal of Spectroscopy Laboratory

摘　　要：在PH≥11碱性溶液中，银（Ag）与铬黑T（EBT）反应生成棕黄色络合物，本文应用β修正新双波长光度法研究银及其络合物化学计量比的测定，由于它能完全消除显色体系中过量EBT干扰，计算出产物真实吸光度，使得该方法分析灵敏度、精密度和准确度均高于单波长比色法。络合物组成比测定比传统法简单、准确、易理解，而且络合剂络合百分率（η％）及络合物实际摩尔吸光系数（εp）首次被测得．分析结果表明：银在0-0.40mg/L浓度范围内，β修正吸光度Ac与其有良好的线性关系，络合物化学计量比γ=4，εp=8．12×104L·mol-1·cm-1．对环境废水，银加标回收率90．3％－104％，相对标准偏差RSD≤4．8％。Silver(Ag) may reat with EBT to form a yellow complex at pH more than 11. This report usesthe updated method named as β-correction dual-wavelength spectrophotometry to determine traceamounts of Ag and its complexation ratio. Because it Can completely eliminate the influence of the excess BET,the sensitivity and accuracy have been increased. The results show that in the range of 0-0. 40mg/L Ag Beer's low is obeyed. The complexation ratio is Ag: EBT = 1: 4,its molar absorptivity εp =8. 12×104 L. mol-1. cm-1. The recovery is between 90. 3% - 104 % with RSD≤4. 8 %.

关 键 词：光度法 银 铬黑T 配合物 

分 类 号：O614.122[理学—无机化学]