二溴羟基苯基荧光酮光度法测定铜合金中锡

Spectrophotometric Determination of Tin in Copper Alloys with 2, 3, 7-Trihydroxy-9-Dibromohydroxyphehylfluorone ( DBH-PF )

本文研究了二溴羟基苯基荧光酮与锡(Ⅳ)的反应条件。在0.4mol/L的硫酸介质中存在OP乳化剂时,锡与试剂形成1:3的桔黄色配合物,最大吸收波长515nm,摩尔吸光系数1.21×10~5。反应选择性良好,可不经分离直接测定铜合金中锡。

In this paper, the conditions of the reaction of tin with DBH-PF were studied.In the presence of nonionic surfactant OP and in 0.4 mol /LHsSO4 medium, tin reacts -with DBH - PF to form a 1 : 3 orange complex with a maximum absorption at 515nm, its molar absorptivity beiog 1.21×105L· mol-1· cm-1.The selectivity is fairly good.Microamounts of tin in copper alloys can be determined directly without separation.