ヒドロキシルアミン-ジアセチルモノオキシムを用いるシアン酸イオンの定量

概要

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The colorimetric determination of cyanate ion by diacetyl monoxime was studied. Cyanate ion reacts with hydroxylamine at 60 °C and converts into hydroxyurea. Resulting hydroxyurea reacts with diacetyl monoxime in the presence of acidic catalyst at 100°C and produces red color. The calibration curve follows the Beers law in the range of 020 ppm CNO- in samples. The recommended analytical procedure is as follows. To 0.5 ml of hydroxylamine solution a mixture of 2.0 ml of a neutral sample solution and 1.5 ml of 0.2 M phosphate buffer solution (pH 7.0) is added. After heating the mixture for 30 minutes in a water bath at 60°C, 1.0 ml of diacetyl monoxime solution and 2.0 ml of acidic catalyst solution are added. The mixture is heated for 15 minutes in a boiling water bath. After cooling in tap water, the absorbance is measured at 520 nm against a reagent blank prepared in the same way. The acidic catalyst solution contains, sulfuric acid, phosphoric acid, thiosemicarbazide and iron alum. The effects of diverse ions on the absorbance of a colored product were examined. This procedure is also applicable to the analysis of various types of industrial waste water.
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