Determination of Ultratrace Metal Elements in Natural Samples by Laser-induced Fluorescence with Time-gate Technique

The determination of ultratrace metal elements is of great important in geochemistry, chemical exploration and many other fields. The laser-induced fluorescence (LIF) with time-gate technique is an extremely efficient method for the determination of ultratrace concentrations of elements. This paper reports on the high sensitive detection researches in our laboratory, included lead in Antarctic ice-snow samples, gold in geogas, gold and palladium in seabed sediment samples, gallium and indium in rock and sediment samples, based on laser-induced fluorescence combined with graphite electrothermal atomization and time-gate technique.