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Determination of mercury in soils and sediments by graphite furnace atomic absorption spectrometry with slurry sampling

1997; Elsevier BV; Volume: 52; Issue: 14 Linguagem: Inglês

10.1016/s0584-8547(97)00104-3

1873-3565

Ignacio López‐García, Mateo Sánchez-Merlos, Manuel Hernández‐Córdoba,

Mass Spectrometry Techniques and Applications

A graphite furnace atomic absorption spectrometric procedure for the determination of mercury is presented, in which the samples are suspended in a solution containing hydrofluoric and nitric acids. Silver nitrate (4% m/v) and potassium permanganate (3%) are incorporated, in the order specified, and aliquots are directly introduced into the graphite furnace. A fast heating programme with no conventional pyrolysis step is used. The detection limit for mercury in a 125 mg ml−1 suspension is 0.1 μg g−1. Calibration is performed by using aqueous standards. The reliability of the procedure is proved by analysing certified reference materials.