Abstract
Sequential P extraction was combined with electron microscop and X-ray spectroscopy to characterise various P species and to study their transformation in settling seston and in recent sediment. During early diagenesis most of the particulate P formed in the water was redissolved. No net transformation into species that would resist dissolution was observed.
It was shown that
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• the phosphorus (P) content and the P flux of settling particles varied seasonally over one order of magnitude
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• particles became enriched with reductant soluble P (BD-P) while settling through the hypolimnion
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• changes in BD-P were highly significantly correlated with changes in reductant soluble iron (BD-Fe)
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• bacteria oxidising Fe and Mn seemed to be mainly responsible for this increase in P concentration
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• other fractions including organic P did not change during sedimentation
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• most of the organic P and of the Fe bound P and 70% of TP was released from the sediment during early diagenesis
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• the sediment surface did not act as a trap for P migrating upwards from deeper sediment layers
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• CaCO3 sedimentation contributed little to P sedimentation but significantly to the permanent burial of P.
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Hupfer, M., Gächter, R. & Giovanoli, R. Transformation of phosphorus species in settling seston and during early sediment diagenesis. Aquatic Science 57, 305–324 (1995). https://doi.org/10.1007/BF00878395
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DOI: https://doi.org/10.1007/BF00878395