Abstract
A method was developed for the determination of mercury by cold vapour generation electrothermal atomic absorption spectrometry with in situ concentration in a palladium-coated graphite tube. The mercury vapour generated by using NaBH 4 is rapidly trapped in the graphite tube, coated with PdCl 2, at 250°C and atomized at 2200°C. The experimental results show that the trapping efficiency for mercury by PdCl 2 is better than that by reduced palladium. Reduction of PdCl 2 to palladium metal gives less favourable mercury trapping. Calibration is achieved with simple aqueous solutions. An absolute detection limit (3σ) of 31.4 pg, corresponding to a concentration detection limit of 628 pg l −1 for 50-ml samples, is obtained. The characteristic mass is 114 pg. The precision for ten replicate determinations is 2.0% (relative standard deviation) at the 1-ng level and 1.8% at the 5-ng level. The method was successfully applied to the determination of mercury in certified water samples, sea water and waste water. The most favourable aspects of the method are its simplicity, high-speed and good reproducibility.
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