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本文提出了一个高灵敏性和高选择性测定银的分光光度法。在pH 4-6、Triton X-100存在下银与4,4′-二(二乙氨基)苯硫酮(BDPTK)形成1:4橙红色络合物,其最大吸收峰在495nm,摩尔吸光系数为1.32×10~5 1·mol~(-1)·cm~(-1)。银在0—1微克/毫升浓度范围符合比耳定律。当掩蔽剂EDTA存在时,该法具有较高的选择性,已用于矿样中银的测定。 新试剂4,4′-二(二乙氨基)苯硫酮(BDPTK)已相继用于金、钯和汞的分光光度测定。本文系统研究了在Triton X-100存在下,BDPTK与银(Ⅰ)的显色反应,具有较高的灵敏度(ε=1.32×10~5 1·mol~(-1)·cm~(-1))和选择性,拟订的测定微量银的分光光度法可以直接用于矿石样品中银的测定。
This paper presents a highly sensitive and highly selective determination of silver spectrophotometry. Silver forms a 1: 4 orange-red complex with 4,4’-bis (diethylamino) phenylthione (BDPTK) in the presence of Triton X-100 at pH 4-6 with a maximum absorption peak at 495 nm, molar absorptivity The coefficient is 1.32 × 10 ~ 5 1 · mol ~ (-1) · cm ~ (-1). Silver in the 0-1 micrograms / ml concentration range in line with Beer’s law. When the presence of masking agent EDTA, the method has a high selectivity, has been used for the determination of silver in ore samples. The new reagent, 4,4’-bis (diethylamino) phenylthione (BDPTK), has been used successively for the spectrophotometric determination of gold, palladium and mercury. This article systematically studied the color reaction of BDPTK with silver (Ⅰ) in the presence of Triton X-100, with high sensitivity (ε = 1.32 × 10 ~ 5 1 · mol -1 cm -1 )) And the selectivity of the proposed determination of trace silver spectrophotometry can be directly used for the determination of silver in ore samples.