Acid dissolution methods for heavy metals determination in pine needles |
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Authors: | Email author" target="_blank">R?P?yki?Email author P?Per?m?ki |
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Institution: | (1) The Town Planning and Building Committee, The Environmental Research Division, City of Kemi, Valtakatu 26, 94100 Kemi, Finland;(2) Department of Chemistry, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland |
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Abstract: | Microwave digestion procedures using HNO3, HNO3+H2O2, HNO3+HClO4, HF mixtures and dry ashing with HF were investigated for heavy metals analysis by either inductively coupled plasma-optical emission spectroscopy (ICP-OES) or ICP-mass spectrometry (ICP-MS) in pine needles. The HF digestion procedures gave about 1.5 times higher values than a mixture of HNO3+H2O2 alone. For Ti determination in needles, the HF procedure using dry ashing is thus recommended. The mean concentrations amounted to 900 mg/kg for Fe and 21.8 mg/kg for Ti in needles collected at an area polluted by a stainless steel works. Those concentrations were 10.6 and 4.3 times higher than in needles collected at an area nearby a pulp mill complex (84.5 mg/kg Fe and 5.0 mg/kg Ti). |
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Keywords: | Pine needles Dissolution Pulp and paper mills Ferrochrome and stainless steel works |
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