Laser ablation-atomic fluorescence approach for the determination of mercury |
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Authors: | C M Rico J M Fernández-Romero and M D Luque de Castro |
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Institution: | (1) Analytical Chemistry Division, Faculty of Sciences, University of Córdoba, E-14004, Córdoba, Spain e-mail: qa1lucam@uco.es, ES |
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Abstract: | A method for the determination of mercury in solid samples using laser ablation coupled with atomic fluorescence spectroscopy
has been developed. An Nd-YAG laser was used for ablation and the vaporised and atomised material was rapidly led to an atomic
fluorescence detector, where excitation and emission took place. The experimental approach was applied to the assessment of
different procedures as sensitive as possible for implementing standard addition methods. Calibration curves were recorded
using the prepared standards, which exhibited linear ranges between 0.5–100 μg/g, with excellent regression coefficients in
all instances (0.9907). The precision, expressed as RSD %, was 3 and 4% for contents of 1 and 30 μg/g, respectively, in the
same pellet; and 7 and 12% for the same contents and different type of pellets. The method has been applied to the determination
of mercury in CRM of sewage sediment and a sludge sample with a known amount of mercury determined by an interlaboratory study.
The results obtained show good agreement with those expected.
Received: 21 December 1998 / Revised: 12 April 1999 / Accepted: 14 April 1999 |
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