クロム酸バリウム-酸懸濁液を用いる微量硫酸イオンの吸光光度定量

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The barium chromate-acid suspension method (JIS K 0102) has been used for the spectrophotometric determination of small amounts of sulfate ion in various water samples. In the analytical procedure for O.3 ppm to 20 ppm, a careful filtration by using glass filter (G4) is required for the remove of excess barium chromate, and there are also some problems: amounts of barium chromate in suspension, change on standing of suspension, etc.The purpose of this paper is to improve these problems on the method. Proposed analytical procedure is as follows. To a sample solution (5.0ml) up to 50 ppm of sulfate ion in a centrifuge tube, 2 ml of a uniformly suspended solution (BaCrO_4 0.5g/l N CH_3CO0H 100 ml+0・02 N HCl 100 ml) are added, and mixed. Then, O.5 ml of 6 N ammonia water containing calcium ions and 5.O ml of ethanol are added to the mixture, and the tube is shaken. After standing for about 10 min, the tube is centrifuged for about 3 min at 3000 rpm. The absorbance of the supernatant solution is measured at 370 nm with a 1.O cm quartz cell against water. When the concentration of sulfate ion is lower than lO ppm, 6 ml of the supernatant solution are filtered through a No. 5C filter paper. To a 5.O ml of the filtrate in a glass tube, 1.0 ml of diphenylcarbazide reagent and 1.O ml of 2 N hydrochloric acid are added and well mixed. The absorbance of this colored solution is measured at 545 nm, This improved method may be applicable to the determination of (O.3〜10) ppm and (1O〜50) ppm of sulfate ion with satisfactory results. The coefficient of variation was O.71% in the 7 analytical results of 5.O ppm of sulfate ion.
社団法人日本分析化学会の論文
1983-01-05

クロム酸バリウム-酸懸濁液を用いる微量硫酸イオンの吸光光度定量

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