【摘要】 报道了水溶性卟啉T（3-CP）PS₄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pKa₃,4为3.90。当Pb²⁺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3.23×10⁵,配合比为1:1,稳定常数K=4.91×10⁷,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。更多还原

【Abstract】 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.更多还原