協同効果を利用したTTAによるコバルト(II)の光度定量法の感度の改善

概要

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A high-sensitive method for the spectrophotometric determination of trace amounts of cobalt(II) with 2-thenoyltrifluoroacetone(TTA) was established. The pH of a sample solution containing up to 20μg of cobalt(II) was adjusted to about 5.5, and cobalt(II) was extracted into a mixture of TTA(5×10-4M) and pyridine (5×10-2M) in benzene. In order to eliminate the excess amount of TTA which reduces the sensitivity of the TTA method to a great extent, the organic phase was washed with an aqueous solution of NaOH(5×10-3M) and the absorbance was measured at 340mμ. The sensitivity of this method was 0.0020 μg/cm2. Although nickel(II) interfered with the determination, most interference caused by the presence of diverse cations could be eliminated by adding fluoride and tartrate ions.
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