摘要
报道了水溶性卟啉T(3-CP)PS_4的合成方法,研究了试剂与银离子的显色反应条件,测定了试剂的离解常数pKa_3,4为3.90。当Pb^(2+)和CTMAB存在时,配合物的最大吸收波长位于427.2nm处,表观摩尔吸光系数为3.23×10~5,配合比为1:1,稳定常数K=4.91×10~7,银含量在0~6μg/25ml范围内符合朗伯—比尔定律。本法可用于阳极泥和光谱底片中微量银的测定。
The synthesis process of meso-tetra ( 3-chloro-4-sulfophenyl ) -porphyrint; T(3-CP)PS4] was described in this paper. The ionization constant of T ( 3-CP ) PS4 was determined by means of spectrophotometry and the pKaa,4 is 3.90. The reaction conditions of the reagent with silver was studied and the color reaction was completed within 3 min at pH 11.5 by heating in boiling water bath. A highly sensitive method for spectrophotometric determination of micro amounts of silver in the presence of Pb2+ and CTMAB has been developed. The molar absorptivity is 3.23×105 L· mol-1 ·cm-1 at 427.2nm. Beer's law is obeyed for silver in the range of 0-6ug/25ml. The interference of foreign ions was also examined. This method can be used for the direct determination of trace silver in anode mud and glass photofilm with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1992年第4期12-15,共4页
Metallurgical Analysis
基金
省自然科学基金资助项目