ゼフィラミン存在下クロムアズロールSによるベリリウムの吸光光度定量

概要

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Beryllium formed a red complex (the absorptionmaximum : 525 nm) with Chromazurol S (GAS) in the presence of zephiramine at pH 10, and the redcolor developed was applied to the Spectrophotometricdetermination of beryllium. Recommended procedureis as follows : To a sample solution containing lessthan 3 *g of beryllium, add 0.5 ml of EDTA solution (0.05M), 1 ml of ammonium chloride solution (0.5 M), 1.0ml of GAS solution (2×10^<-3>M) and 5ml of zephiramine solution (1.35×10^<-2> M). Adjust pH to 10 with sodium hydroxide solution (0.25M) anddilute to 25.0 ml with water. Measure the absorbanceat 525 nm against the reagent blank. Beer's law wasobeyed for (0.04〜1.3) × 10^<-5> M of beryllium. The apparent molar absorptivity was 5.35×10^4dm^3 mol^<-1>cm^<-1>. Less than 1 mg of Mn(II), Gd(II), Zn(II),Al(III), Mo(VI), 0.2mg of Pb(II), Ni(II), Co(II), Cu(II), Fe(III), As (III), 0.1 mg of Sn(II), V(V), and 0.05mg of Cr(III), Ti(IV) did not interfere. Less than 200 mg of chloride and sulfate, and 12 mg of nitrate did not interfere. This method had following merits compared with the CAS-cationic surfactants methods at pH 5〜6 : anions within the range ofconcentrations described above did not interfere, andsmall differences in pH between the sample and thereagent blank solution did not affect the absorbances.
社団法人日本分析化学会の論文
1982-03-05