ABSTRACT
Imura et al [1] have described a spectrophotometric procedure employing 1-hydroxy4-(4-nitrophenylazo)-2-naphthoate as a chromogenic reagent for the determination of triethyllead ions in sediments and sludges. The coloured adduct is extracted with chloroform. The absorption maximum is at 440 nm and the optimum pH for the extraction from 1% aqueous sodium chloride is 8.1-8.3. Dimethyl and diethyllead ions and Pb2+ masked with 0.01 M ethylenediamine NN’-bis (2-hydrocyphenylacetic acid) (disodium salt) and copper and ferrous iron are masked with 0.01 M 1,2diaminocyclohexane-NNN’N’-tetracetate. The limit of determination is 0.2 mg L−1 of triethyllead.
