CRITICAL ASPECTS OF SELECTIVE EXTRACTIONS OF TRACE METALS FROM ESTUARINE SUSPENDED MATTER. Fe AND Mn HYDROXIDES AND ORGANIC MATTER INTERACTIONS.

Abstract

cited By 15International audienceSequential extractions are used for the determination of physico-chemical associations and bioavailability of particulate heavy metals. For the extraction of a given fraction several leaching agents can be employed with varying efficiency. In addition to these problems of a purely chemical nature of 'power' of desorption and dissolution, it is proposed here that the heterogeneity and physical associations (e. g. , coatings) of the various solid fractions may bring additional complications