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Degradation rates of organic phosphorus in lake sediment
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Degradation rates of organic phosphorus in lake sediment
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Journal Article
Degradation rates of organic phosphorus in lake sediment
2007
Overview
Phosphorus (P) binding groups were identified in phytoplankton, settling particles, and sediment profiles by ³¹P NMR spectroscopy from the Swedish mesotrophic Lake Erken. The ³¹P NMR analysis revealed that polyphosphates and pyrophosphates were abundant in the water column, but rapidly mineralized in the sediment. Orthophosphate monoesters and teichoic acids degraded more slowly than DNA-P, polyphosphates, and P lipids. Humic acids and organic acids from phytoplankton were precipitated from the NaOH extract by acidification and identified by ³¹P NMR spectroscopy. The precipitated P was significantly more recalcitrant than the P compound groups remaining in solution, but does not constitute a major sink of P as it did not reach a stable concentration with depth, which indicates that it may eventually be degraded. Since P also precipitated from phytoplankton, the origin of humic-P can not be related solely to allochthonous P.
Publisher
Dordrecht : Springer Netherlands,Springer,Springer Nature B.V
Subject
/ Animal, plant and microbial ecology
/ Biologi
/ Biological and medical sciences
/ Biology
/ Exact sciences and technology
/ Fundamental and applied biological sciences. Psychology
/ Kemi
/ lakes
/ Lipids
/ Magnetic resonance spectroscopy
/ NMR
/ nuclear magnetic resonance spectroscopy
/ P NMR
/ P-31 NMR
/ Plankton
/ Sediment
