Abstract
A highly sensitive procedure is proposed for direct simultaneous atomic absorption determinations of three elements (Ag, Cd, and Pb or Cd, Pb, and Tl) in marine and riverine particulate matter. To decrease the influence of nonselective interference and matrix effects and to improve the detection limits of the elements, the course of the analysis included a preliminary stage of fractional evaporation of the sample (a graphite rod with a diaphragm as the evaporator) and condensation of the elements (a graphite rod as the collector). The condensate atomization proceeded in a rod-cell electrothermal graphite atomizer with independent heating of the zones of evaporation and atomization.
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