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应用表面活性剂——邻苯二酚紫(或苯节酮)测铜合金中的锡已有报道。但因灵敏度不高或对铜的选择性较差,对于测定铜合金中低含量的锡受到了限制。此外,把高分子胺用作萃取剂时,通常是先萃取出金属的简单络合物,经反萃后,再行显色测定,手续烦琐,操作不便,且N-263三元络合物的萃取体系用于铜合金中的锡尚未见诸报道。本文拟定用N-263的甲笨溶液把Sn(ⅳ)-pv—CpB三元络合物萃取出来,经分离和离心后,在有机相直接比色测定,萃取后,不仅保持了原三元络合物的光度性质,摩尔吸光系数ε=6.25×10~4且其对铜的选择性大为提高,不需任何铜的掩蔽剂,即可测出铜合金中含量低至0.02％的锡。方法简便,重现性好。
The use of a surfactant, catechol violet (or benzoin ketone), to measure tin in copper alloys has been reported. However, due to low sensitivity or poor selectivity to copper, the determination of low levels of tin in copper alloys is limited. In addition, when polymeric amines are used as extractants, it is usually a simple complex that first extracts the metal. After stripping, color measurement is performed again, the procedure is cumbersome, and the operation is inconvenient. The N-263 ternary complex is also used. The use of the extraction system for tin in copper alloys has not been reported. In this paper, the ternary complex of Sn(iv)-pv-CpB was extracted from the solution of N-263 in stupid solution. After separation and centrifugation, the organic phase was directly colorimetrically determined. After extraction, it not only retained the original ternary The photometric nature of the complex, the molar absorption coefficient ε=6.25×10~4 and its selectivity to copper is greatly improved, and the tin content in the copper alloy as low as 0.02% can be measured without any copper masking agent. . The method is simple and reproducible.