チオテノイルトリフルオロアセトンによるパラジウム(II)の吸光光度定量

概要

論文の詳細を見る
Palladium (II) is quantitatively extracted from an aqueous solution at pH 5.5〜6.0 with thiothenoyltrifluoroacetone (STTA) in xylene as a colored complex. The excess STTA in xylene can be removed by washing with alkaline solution, the palladium (II)-STTA complex shows an absorption maximum around 410nm. The calibration curve is linear over the range of 0〜30μg of palladium(II) in 10ml of the organic phase. The coefficient of variation on the absorbance for 20 μg of palladium(II) is 0.50%. The The molar absorptivity is 3.7 × 10^4 l mol^<-1> cm^<-1>. molar ratio of palladium(II) and STTA is estimated to be 1 : 2 by the continuous variation method. Copper(II), cyanide(1) and sulfide(II) interfere even when the amount is 1/10 times that of palladium(II). The sensitivity of this method is superior to the previous STTA method (by Ranguekar, et al.). An analytical procedure is as follows. A sample solution containing less than 30 μg of palladium (II) is taken. Five ml of acetate buffer solution is added to adjust the pH of the solution to 5.8±0.2. The volume is made up to 50ml with water, and 10ml of 2.1×10^<-4>M STTA in xylene is added. After shaking for 5 min, the aqueous phase is removed and the organic phase is washed with 10ml of borax-NaOH buffer solution (pH 11.5) by shaking for 1 min. Then the absorbance of the organic phase is measured at 410nm against the reagent blank.
社団法人日本分析化学会の論文
1979-09-05