新显色剂O－Cl－TPPS_4光度法测定微量银的研究及应用

Spectrophotmetric Study On Color Reaction of Trace silver (Ⅰ)With New Reagent Meso-Tetrakis (2-Cl-4-sulfophenyl ) porphyrin and Its Application.

研究了在阳离子表面活性剂ＣＴＭＡＢ存在下，新显色剂Ｏ－Ｃｌ－ＴＰＰＳ４与Ａｇ（Ⅰ）的显色反应。配合物的最大吸收波长为４３０ｎｍ，摩尔吸光系数ε＝１．１０×１０５ｌ·ｍｏｌ－１·ｃｍ－１，银（Ⅰ）的含量在０～７μｇ／２５ｍｌ范围内服从比尔定律，是目前测定Ａｇ（Ⅰ）灵敏度最高的显色反应之一。本法用于定影废液中微量银的测定，获得了满意的结果。

This paper describes a new color reaction of silver (Ⅰ)with meso-Tetrakis (2-Cl-4-Sulfophenyl )porphyrin(O-Cl-TPPS4)in the presence of surfactant cetyltrimethylammonium bromide (CTMAB). The COmplex has a maximum absorption at 430nm with a molar absorptivity of 1. 10 × 105L· mol-1· cm-1. Beer's law is obeyed for. s ;liver (Ⅰ)in the range of 0￣ 7μg/25ml. This method has been used to letermine silver(Ⅰ)in fixet waste with satifactory results.