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研究了５－（６－甲基－２－吡啶）－亚甲基罗丹宁（ＭＰＭＲ）与金的显色反应，在ｐＨ＝５．６醋酸－醋酸铵缓冲介质中，吐温－８０存在下，ＭＰＭＲ和Ａｕ（Ⅲ）生成黄色产物，λｍａｘ＝４５０ｎｍ，ε＝８．１６×１０４Ｌ／（ｍｏｌ·ｃｍ），Ａｕ（Ⅲ）含量在０～１．６μｇ／ｍｌ范围内符合比尔定律。方法用于矿石中金的测定，其结果令人满意。
The color reaction of 5- (6-methyl-2-pyridyl) -methylene rhodanine (MPMR) with gold was studied in the presence of Tween-80 in pH = 5.6 acetate- , Λ = 450 nm, ε = 8.16 × 104 L / (mol · cm). The Beer ’s law was obeyed in the range of 0-1.6 μg / ml for Au (Ⅲ). The method was applied to the determination of gold in ore and the result was satisfactory.