Development of a microwave sample preparation method for the determination of arsenic in humus and moss samples by graphite furnace atomic absorption spectrometry

sample decomposition methods were optimized for the determination of by graphite furnace atomic absorption spectrometry (GFAAS) in moss humus samples. In the first method, 5,0 ml of HNO₃ and 3,0 ml of H₂O₂ were for the decomposition of 500 mg of sample. When humus samples were decomposed this way a slight, undissolved residue remained. Therefore, another sample 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, with integrated or L'vov platfoms, were used in the determination of by GFAAS. Palladium-magnesium nitrate was used as a matrix modifier. reference materials (e.g. humus, moss, lichen, sea lettuce) were analyzed.