摘要
研究了新显色剂4-（对甲氧基苯氨基重氮基）-4′-硝基偶氮苯（简称PMADNA）与镉（Ⅱ）的显色反应。结果表明，在pH11.0的Na2B4O7-NaOH缓冲介质中，以Triton X-100为增溶增敏剂，该试剂与镉（Ⅱ）形成稳定的2：1棕色配合物，其最大吸收波长位于583nm处，表观摩尔吸收系数ε为1.32×10^5L／（mol·cm），镉（Ⅱ）质量浓度在0-0.8μg／mL范围内服从比耳定律，所拟方法操作简便，灵敏度高，选择性好，用于废水样品中微量镉（Ⅱ）的直接测定，结果与原子吸收光谱法一致。
The colour reaction of a new reagent 4-（p-Methoxyphenyaminodiazo）-4′-nltroazobenzene（abbreviated as PMADNA below） with cadmium（Ⅱ） was studied. The results showed that a brown complex was formed in the presence of Triton X-100 and in a medium of borax-NaOH buffer of pH 11.0. The absorption maximum was found at 583 nm, and the apparent molar absorptivity is 1.32 ×10^5L/（mol·cm）. Beer＇s law is obeyed for cadmium（Ⅱ） in concentration the range of 0-0.8 μg/mL. The method is simple and the sensitivity is high. The method has been applied to determine cadmium（Ⅱ） in waste water with satisfactory results.
出处
《化学世界》
CAS
CSCD
北大核心
2009年第12期718-720,共3页
Chemical World
基金
河南省科技攻关计划项目(0624270018)
河南省教育厅科技攻关课题(2008B150001)
