チオシアン酸カリウム-1-フェニル-3-メチル-5-ピラゾロンを用いるピリジンの吸光光度定量法

概要

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A spectrophotometric determination of pyridine using nonpoisonous potassium thiocyanate instead of toxic potassium cyanide has been deviccd. The recommended procedure was as follows. To 1.0ml of potassium thiocyanate solution (SCN-70ppm), 2.0ml of chloramine T solution (0.08w/v%in 0.043M phosphate buffer, pH 6.4) was added. The mixture was kept for 15 minutes in a water bath at 50℃. To this solution each one ml of the neutral sample solution containing pyridine and the 1-phenyl-3-methyl-5-Pyrazolone solution (0.1w/v% in 4v/v%ethylen glycol monomethyl ether) was added, and the resultant solution was allowed to stand for 45 minutes at 50℃. After cooling in water, the absorbance was measured at 610 nm against a reagent blank. The calibration curve followed the Beer's law in the range of 0〜7ppm of pyridine in sample solutions. The coefficient of variation is about 0.7% at 6 ppm pyridine. The influence with divese compounds on the determination were examined.
社団法人日本分析化学会の論文
1975-06-10