2,5-ビス-(2-ピコリルアミノ)-1,4-ベンゾキノンを用いるコバルト(II)の吸光光度定量

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A new spectrophotometric method for the determination of cobalt(II) with 2,5-bis-(2-picolylamino)-1,4-benzoquinone (PABQ) in the presence of sodium L-ascorbate is proposed. PABQ is prepared by refluxing a 1 : 2 mixture of 1,4-benzoquinone and 2-aminomethylpyridine in ethanol. PABQ reacts with cobalt(II) to form a water soluble complex which has an absorption maximum at 560 nm. The calibration curve obeys Beer's law over the concentration range from 0.1 to 2μg/ml of cobalt(II). The apparent molar absorption coefficient is 3.7×10^4dm^3 mol^<-1>cm^<-1>. The recommended procedure is as follows; To a sample solution, 1 ml of 10% sodium L-ascorbate and 5 ml of 10^<-3>M PABQ methanol solution is added, pH is adjusted to 6.5〜7.5 with ammonium acetate solution, and the solution is made up to 50 ml with water. After standing the solution for 15〜20 min, the absorbance is measured at 560 nm against reagent blank.
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