Isotope dilution surface ionization mass spectrometry has been successfully applied to the accurate determination of nickel in ultra pure reagents, ultra pure water and seawater. These reagents and water were purified by sub-boiling method. After spiked with a stable isotope of nickel 61Ni, the sample is heated to dryness and the residue obtained is dissolved in a mixture of a phosphoric acid and silica gel suspension. This solution is applied to the mass spectrometer equipped with a surface ionization device incorporating a rhenium single filament. On the basis of 58Ni/61Ni ratio, the present method can determine ng amount of nickel with a relative error of 1%, the sensitivity limit of this determination for is about 10-13 g.
Isotope Dilution Mass Spectrometry of Nickel in Some Ultra Pure Reagents and Seawater
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