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  • Title: Determination of mercury in sewage sludges by slurry sampling electrothermal atomic absorption spectrometry.
    Author: López-García I, Sánchez-Merlos M, Arroyo-Cortez J, Hernández-Córdoba M.
    Journal: J AOAC Int; 2002; 85(1):25-30. PubMed ID: 11878609.
    Abstract:
    An electrothermal atomic absorption spectrometric procedure was developed for the determination of mercury in sewage sludge, in which the samples were suspended in a solution containing hydrofluoric and nitric acids. Silver nitrate (4%, m/v) and potassium permanganate (3%, m/v) were incorporated as matrix modifiers, and aliquots were directly introduced into the graphite furnace. A fast-heating program with no conventional pyrolysis step was used. The detection limit for mercury in a 50 mg/mL suspension was 0.1 microg/g. Calibration was performed by using aqueous standards. An analysis of certified reference materials confirmed the reliability of the procedure.
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