LA-ICP-MS heavy metal analyses of fish scales from sediments of the Oxbow Lake Certak of the Morava River (Czech Republic) |
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| Authors: | M Holá J Kalvoda O Bábek R Brzobohatý I Holoubek V Kanický R Skoda |
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| Institution: | (1) Department of Chemistry, Masaryk University of Brno, Kamenice 5, 625 00 Brno, Czech Republic;(2) Department of Geological Sciences, Masaryk University of Brno, Kotlářská 2, 611 37 Brno, Czech Republic;(3) Research Centre for Environmental Chemistry and Ecotoxicology, Masaryk University of Brno, Kamenice 126/3, 625 00 Brno, Czech Republic |
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| Abstract: | Heavy metal concentrations were studied in the scales of recent and subrecent (2–25 years old) fish buried in the oxbow lake
sediments of the Morava River. The samples were taken from two cores up to 4-m deep and analysed using laser ablation inductively
coupled plasma mass spectrometry (LA-ICP-MS) and an electron microprobe analysis (EMPA). The results were compared with heavy
metal concentrations of bulk samples of the embedding sediment. The study has revealed substantial differences in heavy metal
contents existing between the recent and subrecent fish scales documenting an extreme rapidity of the diagenesis/fossilization
processes. The most apparent features of the early fossilization include the quick loss of the mucous envelope, collagen and
magnesium and an enormous increase in the heavy metal concentrations in particular iron, which is connected with a colour
change. The variations in heavy metal contents in fish scales within a sample are attributed to variations in heavy metal
content in the environment and variable amounts of organic matter in the embedding sediment. In contrast to the contamination
of the embedding sediment, no general increase in heavy metal concentrations in fish scales was observed down to the cores.
It is inferred that the rapid sorption stabilizes the biologic hydroxyapatite of the fish scales, which thus rapidly attain
a thermodynamic equilibrium with the embedding water-saturated sediment. The results show that the processes of sorption,
fossilization and stabilization of hydroxyapatite can act very quickly over a time scale of several years and represent thus
a great advantage in the preservation of the original signals of the ancient environments. |
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| Keywords: | Geochemistry Heavy metals Pollutants |
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