在pH 4.2的乙酸盐缓冲介质中并在十二烷基硫酸钠的存在下,曙红Y试剂分别与5种有机锡化合物,包括三苯基氯化锡(Ⅰ)、三苯基氢氧化锡(Ⅱ)、三环己基氢氧化锡(Ⅲ)、三苄基氯化锡(Ⅳ)及二苄基二氯化锡(Ⅴ)形成紫红色络合物。其中化合物Ⅳ的吸收峰位于549 nm处,其余4种化合物的吸收峰均位于544 nm处,并测得5种化合物的质量浓度依次在28.9,22.0,23.1,19.2,33.5 mg·L-1范围内与其吸光度呈线性关系,据此提出了以曙红Y为显色剂,测定5种有机锡化合物的分光光度法。上述5种化合物的显色体系的表观摩尔吸光率(ε546)依次为(4.63,4.41,5.09,4.87,5.21)×104L·mol-1·cm-1。应用此方法测定了模拟水样中有机锡化合物的含量,结果与加入量基本一致,测定值的相对标准偏差(n=5)均小于3%。

In an acetate buffer medium of pH 4.2 and in the presence of sodium dodecyl sulfate, eosin Y, as a chromogenic reagent, was reacted separately with 5 organotin compounds, namely triphenylchlorostannane (Ⅰ), triphenylhydroxystannane (Ⅱ), tricyclohexylhydroxystannane (Ⅲ), tribenzylchlorostannane (Ⅳ) and dibenzyldichlorostannane (Ⅴ), to form reddish violet colored complexes, with their absorption maxima at 549 nm (for compound Ⅳ) and 544 nm (for the remainders). Linear relationships between values of absorbances and mass conccentrations of the 5 compounds were found in the ranges within 28.9, 22.0, 23.1, 19.2, 33.5 mg·L-1 respectively. Based on these facts, spectrophotometric methods for determination of the 5 organotin compounds using eosin Y as chromogenic reagent were proposed. Values of molar absorptivity (ε546) for the 5 color reaction systems were found to be (4.63, 4.41, 5.09, 4.87, 5.21)×104L·mol-1·cm-1 respectively. Simulated water samples with addition of standard solution of the 5 compounds separately were analyzed by the proposed method, giving results checked quite well with the amounts of standards added. Values of RSD′s (n=5) found were all less than 3%.