トリチオ炭酸カリウムの発色反応に及ぼす促進作用を利用した超微量マンガン(II)の吸光光度定量

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Spectrophotometric determination of ultratrace amount of copper (II) was reported on our previous paper. A highly sensitive Spectrophotometric method is proposed for the determination of manganese(II). This method is based on the accelerating effect of manganese(II) ion on the coloration of potassium trithiocarbonate (K_2TTC). By this method, ultratrace amount of manganese(II) can be determined. The recommended procedure is as follows: To a sample solution (4 cm^3), containing manganese(II) less than 140 ng, was added alkaline solution of pH 12.2 (12 cm^3: containing 0.01 w/v % sodium citrate and 1.8 × 10^<-3> mol dm^<-3> potassium cyanide). The mixed solution was cooled with ice, and then added a precooled 0.5 w/v% K2TTG solution (4 cm^3). The reaction was allowed to continue for 1 h at 40°G in a dark room. The absorbance of solution was measured at 390 nm against the reagent blank. This accelerating effect was facilitated with an increase in temperature, but the reaction product was decomposed rapidly at above 45℃. Serious interferences from bismuth(III), copper (II), iron(II), iron(III), and nickel(II) ions can be eliminated by the addition of sodium citrate and potassium cyanide. The R.S.D. (n=5) of determination for the standard reference material (NIES No. 1 PepperBush) was 3.9 %. This method is highly sensitive with the apparent molar absorptivity of 9x 106 dm^3 mol^<-1> cm^<-1>, and enables the facile determination of manganese (II) at ppb level.
社団法人日本分析化学会の論文
1984-09-05

トリチオ炭酸カリウムの発色反応に及ぼす促進作用を利用した超微量マンガン(II)の吸光光度定量

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