Fu-Sheng W, Fang Y
Department of Chemistry, China University of Science & Technology, Hefei, China.
Talanta. 1983 Mar;30(3):190-2. doi: 10.1016/0039-9140(83)80049-6.
A highly sensitive and selective procedure for spectrophotometric determination of silver has been developed. At pH 9.2, in the presence of Triton X-100, silver forms a dark red-violet complex with cadion 2B which has an absorption maximum at 565 nm. The molar absorptivity is 1.0 x 10(5) l.mole(-1).cm(-1). Beer's law is obeyed for silver in the range 0.02-0.8 mug ml . The colour reaction, if EDTA is used as a masking agent, is free from interference by the 20 cations and 19 anions investigated. Only Cl(-), Br(-), I(-), S(2-) and CN(-) interfere and must be absent. This method has been used to determine silver in waste-water.
已开发出一种用于分光光度法测定银的高灵敏度和高选择性方法。在pH 9.2条件下，在 Triton X - 100存在时，银与镉试剂2B形成暗红色 - 紫色络合物，该络合物在565 nm处有最大吸收。摩尔吸光系数为1.0×10⁵ l·mol⁻¹·cm⁻¹。银在0.02 - 0.8 μg/ml范围内符合比尔定律。如果使用EDTA作为掩蔽剂，该显色反应不受所研究的20种阳离子和19种阴离子的干扰。只有Cl⁻、Br⁻、I⁻、S²⁻和CN⁻有干扰，必须不存在。该方法已用于测定废水中的银。
