銅, マンガンおよびコバルトの原子吸光光度定量におけるチタンおよびニオブに起因する新干渉現象

概要

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In the atomic absorption spectrophotometry using an air-acetylene flame, both titanium and niobium existing as peroxo-complex compounds (presumably peroxo-) in nickel-base alloy sample solution seriously interfere with the determination of copper, manganese, and cobalt. Obtained absorbance readings for these elements show random values. The following two dissolution treatments have been examined: 0.5 g portions of the sample are dissolved in (1) HNO3 (5 ml) +HCl (5 ml) +HF (1 ml), (2) 3N-H2SO4 (25 ml) +HCl (10 ml) +H2O2 (10 ml), and the solutions are diluted exactly to 100 ml with water. In the former, no interference effect is observed. In the latter, irregular absorbance readings are obtained for copper, manganese, and cobalt. No interference effect is observed, however, when a nitrous oxide-acetylene flame is used. The mechanism of the interference effects has been investigated by using an especially prepared twin-nebulizer. From the result, it is concluded that the origin of the interference effects can be attributed to the vaporization behavior of wet aerosols. Probably, these aerosols make refractory compounds in the air-acetylene flame and the compounds occlude copper, manganese, and cobalt and the incomplete dissociation of these compounds traversing the flame zone causes the irregular absorbance readings.
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