Abstract
A rapid, extraction-spectrophotometric determination of trace amounts of lead in heavy metal salts is proposed. Owing to application of ammonia as masking agent, the extraction system cryptand (2.2.2)-eosin-chlorobenzene exhibits very high selectivity towards transition metal cations. Using standard addition method, lead is determined without matrix separation in nitrates, chlorides, acetates and sulphates of such metals as Ag, Cd, Ni, Cu and Zn. The effect of matrix on lead extraction efficiency and blank value is also discussed. The high sensitivity and selectivity of the proposed method allow to determine of lead at the level 10−3−10−4%.
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Szczepaniak, W., Juskowiak, B. Extraction-spectrophotometric determination of lead in heavy metal salts with cryptand (2.2.2) and eosin. Mikrochim Acta 92, 237–242 (1987). https://doi.org/10.1007/BF01201845
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DOI: https://doi.org/10.1007/BF01201845