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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Acknowledgements
The authors wish to thank the technical staff of the Geological Survey of Finland, who made all the chemical analyses.
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Pöykiö, R., Perämäki, P. Acid dissolution methods for heavy metals determination in pine needles. Environ Chem Lett 1, 191–195 (2003). https://doi.org/10.1007/s10311-003-0038-3
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DOI: https://doi.org/10.1007/s10311-003-0038-3