Department of Chemical Technology, Inorganic Chemistry Laboratory, University Of Mumbai, Matunga, Mumbai 400 019, India.
Talanta. 1998 Aug;46(5):1181-6. doi: 10.1016/s0039-9140(97)00364-0.
Solvent extraction of tin(IV) from hydrochloric acid media was carried out with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) in toluene. Tin(IV) was quantitatively extracted with 2.5x10(-2) M PC-88A in toluene from 0.1-0.3 M HCl when equilibrated for 5 min. Tin(IV) from the organic phase was stripped with 4 M HCl and determined spectrophotometrically by both the morin and pyrocatechol violet method. The nature of the extracted species was determined from the log-log plots. Various other diluents such as xylene, hexane and cyclohexane also gave quantitative extraction of tin. The metal loading capacity of the reagent was found to be 0-15 ppm of tin(IV). The extraction of tin(IV) was carried out in the presence of various ions to ascertain the tolerance limit of individual ions. Tin(IV) was successfully separated from commonly associated metal ions such as antimony(III), bismuth(III), lead(II), thallium(I), copper(II), nickel(II), etc. The method was extended for determination of tin in real samples.
用 2-乙基己基膦酸单 2-乙基己基酯（PC-88A）在甲苯中从盐酸介质中萃取四价锡。当平衡 5 分钟时，用 2.5x10(-2) M PC-88A 在甲苯中可以从 0.1-0.3 M HCl 中定量萃取四价锡。从有机相中用 4 M HCl 反萃取四价锡，并通过桑色素和邻苯二酚紫法分光光度法测定。从对数图确定了萃取物种的性质。其他各种稀释剂，如二甲苯、己烷和环己烷也可以定量萃取锡。该试剂的金属负载能力被发现为 0-15 ppm 的四价锡。在存在各种离子的情况下进行了四价锡的萃取，以确定单个离子的耐受极限。成功地从常见的伴生金属离子如三价锑、三价铋、二价铅、一价铊、二价铜、二价镍等中分离出四价锡。该方法已扩展用于实际样品中锡的测定。
