INTERCOMPARISON OF ALKYLLEAD COMPOUND DETERMINATION IN MUSSELS AND WATER BY 2 ANALYTICAL TECHNIQUES - GAS-CHROMATOGRAPHY ATOMIC-ABSORPTION SPECTROMETRY AND DIFFERENTIAL-PULSE ANODIC-STRIPPING VOLTAMMETRY

Methods for the determination of tetraalkyllead (TAL) and ionic alkyll ead (IAL) compounds in mussel tissues are described with each step in the procedures critically evaluated. It was established that digestion of mussel tissue with tetramethylammonium hydroxide should be perform ed at room temperature to avoid decomposition of some alkylleads, that TAL and IAL compounds should be extracted and determined separately, and that for extraction into hexane and reextraction into acid aqueous solution, a double extraction must be used. Cleaning of extracts thro ugh a silica column is recommended before gas chromatography atomic ab sorption spectrometry (GC AAS) measurement. Determination of IAL compo unds in environmental samples (mussel tissue and various kinds of natu ral waters) by two independent analytical techniques (GC AAS and DP AS V - differential pulse anodic stripping voltammetry) is compared.