研究了氯磺酚偶氮硫代若丹宁(HSCT)与银的显色反应.在pH3.5的柠檬酸-氢氧化钠缓冲介质中,HSCT与银反应生成2:1稳定络合物;该络合物可被C18固相小柱定量萃取,小柱上保留的络合物用DMF洗脱后用分光光度法测定;λmax＝545nm,体系ε=7.81×104L/（mol·cm）,银质量浓度在0～1.5mg/L内符合比尔定律.该方法可用于水样中痕量银的测定.
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