過塩素酸ナトリウム存在下クロムアズロールS及びトリトンX-100によるベリリウムの吸光光度定量

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Beryllium containing the large amount of diverse ions was determined with Chromazurol S (CAS) and Triton X-100 in the presence of sodium perchlorate after the separation as acetylacetonate. Beryllium was separated by its extraction as acetylacetonate in the presence of EDTA at pH 7 into benzene and back-extraction in 3 M hydrochloric acid for three times. After the addition of a few drops of perchloric acid and 5 ml of nitric acid, the aqueous phase was evaporated to almost dryness and the residue was dissolved in 3 ml of water, followed by the determination procedure. Recommended procedure is as follows. Add 2 ml of EDTA solution (0.05 M), 1.0 ml of CAS solution (0.25 %) and 2 ml of Triton X-100 solution (0.02 g ml^<-1>) to the sample solution. Adjust pH to 5.1 with sodium acetate solution (0.2 M). Add 6 g of sodium perchlorate, dissolve the mixture and dilute to 25.0 ml with water. Measure the absorbance at 605 nm against the reagent blank in a 10mm and a 50mm cell for (0.1〜2) μg and (0.01〜0.1) μg of beryllium, respectively. Beer's law was obeyed for (0.01〜2) μg of beryllium in 25 ml. The molar absorptivity was 1.1 ×10^5 dm^3 mol^<-1> cm^<-1>. Sodium perchlorate was added to remove the effect of anions such as perchlorate and acetate. Less than 3mg of Ca(II), Mg(II). Zn(II), Cd(II), Pb(II), Cu(II), Ni(II), Fe(III), Al(III). Cr(III) and 4g of chloride, nitrate and sulfate did not interfere.
社団法人日本分析化学会の論文
1980-12-05

著者

西田宏
岩手大学工学部

過塩素酸ナトリウム存在下クロムアズロールS及びトリトンX-100によるベリリウムの吸光光度定量

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