The Analysis of Galvanizing Preflux Solutions for Zinc by Flow Injection-Flame Atomic Absorption Spectrometry

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Abstract
A direct flow injection flame atomic absorption spectrometry method of determining zinc salt solutions with concentrations of 100's g dm−3 is reported. It was shown that high concentrations of KCl, NaCl and NH4Cl do not significantly interfere with the determination of zinc in both the mg dm−3 and g dm−3 concentration ranges. Where g dm−3 concentrations were determined a secondary spectral line at 307.6 nm was found satisfactory. Galvanizing preflux solutions were analyzed both after dilution to the mg dm−3 range at 213.9 nm and directly injected at 307.6 nm. Precisions of better than 6.6% rsd were observed by the direct method compared with better than 4.8 by dilution techniques. Concentrations up to 110 g dm−3 in zinc were determined the total salt content being greater than 300 g dm−3.