摘要
Ｐｂ２＋、Ｃｄ２＋、Ｈｇ２＋在ｐＨ６．５的硼砂－盐酸缓冲溶液中，与四（４－三甲铵基苯基）卟啉（ＴＡＰＰ）生成稳定配合物，采用ＫＩ和低聚度聚乙烯醇（ＰＶＡ）增敏、增溶，Ｐｂ２＋、Ｃｄ２＋、Ｈｇ２＋的εｍａｘ分别为ε４８１．５（４．９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１）、ε４５７（７．９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１）、ε４４４．５（８．１×１０４Ｌ·ｍｏｌ－１·ｃｍ－１）。在三吸收峰相互重叠的情形下，利用比波谱导数和零交点法，同时测定它们的含量，Ｐｂ２＋、Ｃｄ２＋、Ｈｇ２＋的检出限分别达４μｇ／Ｌ、２μｇ／Ｌ和１０μｇ／Ｌ。方法计算简便、快速。
In the buffer intensity of the borax and hydrochloric acid with pH6.5 , Pb 2+ 、Cd 2+ and Hg 2+ react with Tetra 4 trimethylaminobenzene porphyrin [T(4 TMAP)P] to produce a stable complex , then Pb 2+ 、Cd 2+ and Hg 2+ 's ε max can be found respectively to be ε 481.5 (4.9×10 5 L·mol -1 ·cm -1 )、 ε 457 (7.9×10 5 L·mol -1 ·cm -1 )and ε 444.5 (8.1×10 4 L·mol -1 ·cm -1 ), after the adoption of spike and solubilization by means of KI and low degree of PVA(polyvinyl alcohol). Under the overlapping condition of 3 absorption peaks , their contents can be determined by means of derivative ratio spectrum and zero crossing. They detection limit is 4μg /L, 2μg /L and 10μg/L respectively and the calculating method is simple and rapid.
出处
《光谱实验室》
CAS
CSCD
1999年第1期37-41,共5页
Chinese Journal of Spectroscopy Laboratory
关键词
比波谱导数
零交点
配合物
铅
镉
汞
测定
TAPP
Derivative Ratio Spectrum, Zero Crossing,Tetra 4 trimethylaminobenzene Porphyrin, Complex.
