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本文提出了新显色剂４－羟基－３，５－二溴苄叉绕丹宁测定银（Ｉ）的分光光度方法．在ｐＨ１２，聚乙二醇－４００存在下，银（Ｉ）与４－羟基－３，５－二溴苄叉绕丹宁形成１：２深红色络合物，其最大吸收波长在５１０ｎｍ，并且在室温下可稳定存在２４小时以上．在２５ｍＬ容积中，Ａｇ￣＋在０～１００μｇ范围符合比尔定律，摩尔吸光系数为１．１５×１０￣４Ｌ·ｍｏＬ￣（－ｌ）·ｃｍ￣（－１），标准偏差为０．００３（ｎ＝１０）．
In this paper, a spectrophotometric method for the determination of silver (I) using 4-hydroxy-3,5-dibromobenzylidene rhodanine as a new reagent is proposed. Silver (I) forms a 1: 2 dark red complex with 4-hydroxy-3,5-dibromobenzylidene around tannin at pH 12 in the presence of polyethylene glycol-400, with a maximum absorption wavelength at 510 nm and Stable for more than 24 hours at room temperature. Beer’s law was obeyed in the range of 0 ~ 100μg with a molar absorptivity of 1.15 × 10-4L · molL ~ (-1) · cm ~ (-1) and a standard deviation of 0.003 n = 10).