Near melting point flow injection: a drastic enhancement in FAAS detection limits.
The described technique is based on segregation phenomena taking place in solids near their melting point. High impurity concentration occurs in a liquid phase at the grain boundaries. A continuous flow of an adequate solvent is used in far from equilibrium conditions to reach high extraction efficiency of the analyte. As an example, the determination of trace amounts of caesium in metallic sodium is described. The 5 mg/kg detection limit of conventional FAAS is thus lowered to a few microg/kg.
Walter
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S
Ecole Nationale Supérieure de Chimie de Mulhouse, Groupe Sécurite et Ecologie Chimiques, 3, rue Alfred Werner, F-68093, Mulhouse Cedex, France.
Aleboyeh
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A