Abstract
Concentrations of lead in the range 0.15–750 μg −1 were measured in metallic matrices (copper, brass, steel, and zinc) by laser excited atomic fluorescence combined with UV laser ablation in a low-pressure (130 mbar) argon atmosphere. The mass of material ablated was determined by repetitive weighing of the target prior to and after approximately 10 000 ablating shots. The fluorescence was excited after a 100 μs delay relative to the ablation pulse. A long integration time of 200 s was used to provide a representative determination of bulk concentrations. No matrix effect was observed, providing a universal calibration curve for all samples with relative standard deviations of about 20%. The relative and absolute limits of detection were 72 ng g −1 and 0.5 fg, respectively.
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