摘要
研究了Ａｇ（Ⅱ）与ｍｅｓｏ－四（４－三甲铵苯基）卟啉的显色反应．在ｐＨ＝５．０的缓冲溶液中形成稳定的Ａｇ（Ⅱ）－Ｔ（４－ＴＡＰ）Ｐ配合物，其最大吸收波长为４２３ｎｍ，组成为Ａｇ（Ⅱ）∶Ｔ（４－ＴＡＰ）Ｐ＝１∶１，摩尔吸光系数为３．２６×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，Ａｇ（Ⅱ）的浓度在０．００４μｇ／ｍＬ～０．１４μｇ／ｍＬ范围内符合比尔定律，银的检出限为３．９ｎｇ／ｍＬ．基于此建立的测银方法灵敏度高，结合巯基棉分离干扰，可用于化探样品中银的测定．
The colour reaction of silver(Ⅱ) with T(4 TAP)P is studied.A stable complex of Ag(Ⅱ) T(4 TAP)P is formed at pH=5.0,and its molar absorptivity is 3.26×10 5 L·mol -1 ·cm -1 at 423 nm.The composition is Ag(Ⅱ)∶T(4 TAP)P=1∶1,Beers law is obeyed in the silver concentration range of 0.004 μg/mL￣0.14 μg/mL.The detection limit is 3.9 ng/mL .The method is sencitive to the determination of silver in geochemical samples with satisfactory results.
出处
《郑州轻工业学院学报》
1997年第3期15-18,共4页
Journal of Zhengzhou Institute of Light Industry（Natural Science）
