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本文提出了一种灵敏度较高的吸光光度测锡的方法,系以新合成之香草基荧光酮(英文缩写为VF)为试剂,在阳离子表面活性剂十六烷基三甲基溴化铵存在下形成红色配合物,表观摩尔吸光系数达1.84×10~5。允许酸度范围宽,经用于测定铜合金中约0.08%的锡,结果令人满意。相对误差<1.3%,变动系数(n=6)<1.3%。较苯基荧光酮法、3-吡啶荧光酮法、焦儿茶酚紫法等效果更佳(ε更高)。试验部分一试剂与仪器锡标准溶液:称取0.5000g锡粒,加入25ml浓H_2SO_4,加热溶完后继续10min,冷却,移至500ml量瓶中,用H_2SO_4(3M)稀释至刻度,摇匀,即得1.00mg·ml~(1-)之贮备液。工作溶液系用H_2SO_4(1M)稀释成
In this paper, a new method for the determination of tin by spectrophotometry with high sensitivity is proposed. The new synthesized vanillin fluoroketone (abbreviated as VF) is used as a reagent in the presence of cationic surfactant cetyltrimethylammonium bromide Under the formation of a red complex, the apparent molar absorption coefficient of 1.84 × 10 ~ 5. Allowing a wide range of acidity, used in the determination of about 0.08% of the copper alloy tin, the results are satisfactory. Relative error <1.3%, coefficient of variation (n = 6) <1.3%. Compared with phenylfluorone method, 3-pyridylfluorone method, pyrocatechin method and so on better (ε is higher). Test part of a reagent and instrument tin standard solution: Weigh 0.5000g tin particles, add 25ml concentrated H_2SO_4, heated to dissolve continue 10min, cooled and moved to 500ml volumetric flask, diluted with H_2SO_4 (3M) to the mark, shake, That was 1.00mg · ml ~ (1-) of the stock solution. The working solution was diluted with H 2 SO 4 (1M)