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本文研究了乙基罗丹明 B-砷铜杂多酸-PVA 显色体系,确定了分光光度测定痕量砷的条件,方法较灵敏,表观摩尔吸光系数达3.0×10~5L·mol~(-1)·cm~(-1).经元素分析、摩尔吸光系数对比以及红外光谱等方法确定:缔合物的分子式为(C_(30)H_(35)O_3N_2]_3·(As(Mo_3O_(10))_4];ERB~+阳离子和[As(Mo_3O_(10))_4]~(3-)配阴离子以离子键力相缔含,染料阳离子的结构未受缔合作用的影响.
In this paper, ethyl rhodamine B-arsenic copper heteropolyacid-PVA color system was studied. The conditions for the determination of trace arsenic by spectrophotometry were determined. The method was sensitive and the apparent molar absorptivity reached 3.0 × 10 ~ 5L · mol ~ ( -1) · cm -1. The elemental analysis, comparison of molar absorptivity and infrared spectroscopy indicated that the molecular formula of the complex was (C_ (30) H_ (35) O_3N_2] _3 · (As (Mo_3O_ 10)) _4]. The structures of the cation of the dye and the cation of [As (Mo_3O_ (10)) _4] ~ (3-) are related by the ionic bond force.