ゼフィラミンによる微量スズ(IV)の吸光光度定量法 : 分析化学におけるオニウム化合物の適用に関する研究(第29報)

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The thiocyanate complex of tin(IV) reacts with zephiramine to give a white precipitate. The precipitate, extracted into chloroform, has an absorption maximum at 273 nm. The molar absorbancy is about 7500 at 273 nm and is stable for at least 5 hours.The composition for the extracted species is assumed to be 1:4 (Sn:zephiramine) by the continuous variation study. Extraction was carried out with 10 ml of chloroform from 25 ml of the aqueous sample solution. Beers law holds for the concentration of 5.0×10-6 M to 5.0×10-5 M in the aqueous phase. Micro amounts of tin(IV) can be determined by this method. The effects of diverse ions were investigated, and its result was shown in Table I. Many ions except mercury, copper, iron, cobalt, palladium, platinum, ruthenium, iodate, periodate, vanadate, molybdate and tungstate, do not interfere with the determination when their amounts are equal to that of tin (IV).
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