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在聚乙烯醇(PVA)存在下,铑与钼酸盐和丁基罗丹明B(BRB)形成寓于缔合物,缔合物的最大吸收峰位于570nm,摩尔吸光系数ε值为3.22×10~5L·mol~(-1)·cm~(-1),服从比耳定律范围0～8μgRh/25ml,摩尔比Rh:BRB1:4:,缔合物至少稳定240h。测定铑的适宜条件为C_(HCIO_4)=1.5mol/L,C_(MoO_4~(8-)),3.3×10~(-8)mol/L,C_(BRA)=3.8×10~(-5)mol/L,PVA0.08％。考察了41种共存离子的影响,常见元素不干扰。本法已用于催化剂和回收液中铑的测定,结果满意。本文还探讨了反应机理。
In the presence of polyvinyl alcohol (PVA), rhodium and molybdate and butyl rhodamine B (BRB) form an associative complex with the maximum absorption peak at 570 nm and a molar absorptivity ε of 3.22 × 10 ~ 5L · mol ~ (-1) · cm ~ (-1), obeying Beer’s Law 0 ~ 8μg Rh / 25ml, molar ratio Rh: BRB1: 4: The suitable conditions for the determination of rhodium were as follows: HC1_4 = 1.5mol / L, C_ (MoO_4-8), 3.3 × 10 -8 mol / L, BR = 3.8 × 10 -5 ) mol / L, PVA0.08%. Examined the impact of 41 kinds of coexisting ions, common elements do not interfere. This method has been used in the determination of rhodium catalyst and recovery solution, with satisfactory results. This article also discusses the reaction mechanism.