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介绍了一种用新合成的显色剂Ｎ－烯丙基－Ｎ′－（氨基对苯磺酸钠）硫脲（ＡＳＡＴ）光度法测定微量金（Ⅲ）的方法。在ｐＨ３５～５５的ＨＡｃ－ＮａＡｃ缓冲体系中，该试剂和金（Ⅲ）形成一种稳定的水溶性配合物，其组成为ｎ（Ａｕ３＋）∶ｎ（ＡＳＡＴ）＝１∶２，配合物的最大吸收峰位于２９８６ｎｍ处，表观摩尔吸光系数为１１４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ａｕ３＋量在７２～５６８μｇ／Ｌ服从比尔定律，相关系数ｒ＝０９９９３。将该法应用于金矿石中微量金的测定，获得满意的结果。
A method for the determination of trace gold (Ⅲ) with the newly synthesized reagent N-allyl-N ’- (sodium p-aminobenzenesulfonate) thiourea (ASAT) The reagent and gold (Ⅲ) form a stable water-soluble complex in the HAc-NaAc buffer system at pH 3.5-5.5. The composition of the reagent is n (Au3 +): n (ASAT) The maximum absorption peak of the complex is located at 298 6nm, the apparent molar absorption coefficient of 1 14 × 105L · mol-1 · cm-1. Beer’s law was obeyed in the range of 72-586 μg / L for Au3 +, with a correlation coefficient of r = 0.9993. The method is applied to the determination of trace gold in gold ore and obtains satisfactory results.