第4級アンモニウム塩によるモリブデン(VI)-アリザニンレッドS錯体の抽出およびこれを利用したモリブデン(VI)の吸光光度定量

概要

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The extraction of molybdenum (VI) -Alizarin Red S complex with quaternary ammonium chloride has been investigated for the determination of molybdenum (VI). The complex extracted into 1, 2-dichloroethane has an absorption maximum at 525 mμ, with a constant absorbance in the pH range from 4.5 to 5.5. The molar ratio of molybdenum (VI) to Alizarin Red S in the complex is estimated to be 1 to 2 for aqueous phase, and 1 to 3 for organic phase. By extracting the complex into organic phase with tetradecyl-dimethylbenzyl ammonium chloride, the sensitivity increases about three times as much as that of aqueous phase. For the absorbance of complex in analytical condition, Beer's law is obeyed at least up to 2.5 × 10<SUP>-5</SUP><I>M</I> molybdenum (VI) in 1, 2-dichloroethane. The effect of diverse ions is also examined.