Abstract

Recently it was reported by Dong that for the analysis of zinc by atomic absorption spectrometry (AAS), the percentage absorption of zinc in the flame is a function of the pH of the zinc-containing solution. An examination of the recent literature concerning the atomic absorption analysis of Zn by AAS failed to disclose other reports of pH affecting this determination. Ezell reported that for the determination of Zn in alumina, using a set of standards prepared by adding Zn to solutions of alumina in 2% sodium hydroxide, "The same values [Zn content of alumina samples] have been obtained using either acid or alkaline standards." Fishman made no mention of a pH effect in the analysis of natural waters for Zn and compared his analysis of Zn by AAS to the accepted dithizone extraction method, obtaining comparable values by either method.

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