ガレインと塩化セチルピリジニウムを用いるゲルマニウム(IV)の吸光光度定量

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In the presence of excess cetylpyridinium chloride (CPC) in an acidic solution germanium (IV) forms a red complex with gallein, whose colour was very stable. The colour of germanium(IV)-gallein complex was used for spectrophotometric determination of germanium(IV) in water. The absorbance of the complex was constant over the pH range from 0.3 to 1.3 when pH was adjusted with 1.5 N hydrochloric acid. The maximum wave length of the germanium(IV)-gallein complex at pH 0.9 was at about 545 nm against water. A linear calibration curve was obtained for 022 μg Ge(IV)/10 ml at 545 nm or 620 nm against the reagent blank. The recommended analytical procedure of germanium(IV) is as follows. A sample containing 022 μg Ge(IV)/ml is taken in a 10-ml measuring flask, and 1.0 ml of 1.0 × 10-2 M CPC solution, and 2.0 ml of 1.0 × 10-3 M gallein methanolic solution are added. It is diluted to 10.0 ml with water. The absorbance of gallein-germanium(IV)-CPC solution is measured at 545 nm and 620 nm against the reagent blank. The sensitivity was 0.01 μg Ge(IV)/ cm2 for an absorbance of 0.001. The effects of diverse ion on the absorbance of the complex were examined.
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