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ｐＨ值在７．０—８．５的范围内，锡与偶氮邻苯二酚苯基荧光酮、吐温－８０形成络合物，其最大吸收峰５５６ｎｍ，摩尔吸光系数２．９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，锡的含量在０—６μｇ／２５ｍＬ范围内遵守比耳定律。本方法对干扰离子的影响和消除进行了研究。本方法已被用于岩石样中锡的测定，结果满意。
The pH ranged from 7.0 to 8.5. Tin formed a complex with azo catechol fluorophenyl ketone and Tween-80. The maximum absorption peak was 556 nm and the molar absorptivity was 2.9 × 105 L · Mol-1 · cm-1, and the content of tin obeys Beer’s law in the range of 0-6μg / 25mL. The method has been studied for the influence and elimination of interfering ions. The method has been used for the determination of tin in rock samples with satisfactory results.