Preconcentration Methods for Determination of Thallium in Natural Waters

Abstract

Two preconcentration procedures for electrothermal atomic absorption (ETAAS)
determination of thallium in mineral, spring, tap, river, underground and sea water were
developed and compared: (i) Column solid phase extraction with new sandwich type disposable
sorbent columns (CSPE) and (ii) Filtration of thallium dithiocarbamates through a Millipore filter
of 0.45 m pore size followed by dissolution of the filter + precipitate in IBMK (PP) and
introduction of the obtained organic slurry into the graphite furnace. With addition of indium as
sorption and precipitation collector enrichment factors of 100 (CSPE) and 200 (PP) were
achieved.