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报告一类光度法测定纳克量锡的新方法.在聚乙烯醇(PVA)存在下,锡(Ⅳ)与钨酸盐可分别和碱性染料罗丹明B(RB),丁基罗丹明B(BRB),耐尔蓝(NB)反应,形成离子缔合物,缔合物的最大吸收分别位于580nm(RB),565nm(BRB)和580nm(NB),表观摩尔吸光系数ε值分别为3.23×107L·mol-1·cm-1(RB),2.54×107L·mol-1·cm-1(BRB)和2.95×107L·mol-1·cm-1(NB).服从比耳定律的范围分别在0.4～2.0μg·L-1(RB),0～2.4μg·L-1(BRB)和0～2.0μg·L-1(NB),检出限(3σ)分别为0.031μg·L-1(RB,n=12),0.073μg·L-1(BRB,n=11)和0.083μg·L-1(NB,n=11).离子缔合物至少稳定72～240h.考查了40多种共存离子的影响,确立了测定痕量锡的酸度条件等.研究了缔合物的红外光谱,锡钨杂多络阴离子具有Keggin结构.方法均已用于某些合金钢和锌合金中痕量锡的测定,结果满意
A new spectrophotometric method for the determination of tin content in tin is reported. Tin (Ⅳ) and tungstate can react with basic dyes Rhodamine B (RB), butyl rhodamine B (RB), 565 nm (BRB) and 580 nm (NB) respectively. The apparent molar absorptivity ε values of the complexes were (BR) and Nile blue 3.23 × 107L · mol-1 · cm-1 (RB), 2.54 × 107L · mol-1 · cm-1 (BRB) and 2.95 × 107L · mol-1 · cm- The limits of detection were 0.4-2.0μg · L-1 (RB), 0-2.4μg · L-1 (BRB) and 0-2.0μg · L-1 (NB) .The detection limits (3σ) were 0.031μg · (RB, n = 12), 0.073μg · L-1 (BRB, n = 11) and 0.083μg · L-1 (NB, n = 11) The effect of more than 40 kinds of coexisting ions has been established and the determination of acidity conditions of trace tin has been established.The infrared spectra of the complexes have been studied.The Keggin structure of tin and tungsten heteropolyanions has been studied.The methods have been used in some alloyed steels and zinc Determination of trace tin in alloy with satisfactory results