Volume 28, Number 9, November 2000Endocrine disruptors
|Page(s)||830 - 834|
Development of a microwave sample preparation method for the determination of arsenic in humus and moss samples by graphite furnace atomic absorption spectrometryP. Perämäki1, M. Pesonen1 and J. Piispanen2
1 University of Oulu, Department of Chemistry, PO. Box 3000, FIN-90014 University of Oulu, Finland
2 Finnish Forest Research Institute, Muhos Research Station, Kirkkosaarentie 7, FIN-91500 Muhos, Finland
(Received July 11, 2000; revised November 28, 2000; accepted December 5, 2000.)
Two sample decomposition methods were optimized for the determination of arsenic by graphite furnace atomic absorption spectrometry (GFAAS) in moss and humus samples. In the first method, 5,0 ml of HNO3 and 3,0 ml of H2O2 were used for the decomposition of 500 mg of sample. When humus samples were decomposed in this way a slight, undissolved residue remained. Therefore, another sample decomposition method, including hydrofluoric acid, was also tested (5,0 ml HNO3; 3,0 ml H2O2; 0,4 ml HF; 2,5 ml H3BO3). Pyrolytically coated graphite tubes, equipped with integrated or L'vov platfoms, were used in the determination of arsenic by GFAAS. Palladium-magnesium nitrate was used as a matrix modifier. Several reference materials (e.g. humus, moss, lichen, sea lettuce) were analyzed.
Key words: Arsenic -- graphite furnace atomic absorption spectrometry -- microwave sample decomposition -- humus and moss samples.
© EDP Sciences, Wiley-VCH 2000