『Abstract
Phosphorus (P) pollution in the sediments of seven artificial
landscape lakes was studied via fractionation and phosphorus-31
nuclear magnetic resonance (31P NMR) spectroscopy.
The lake sediments accumulated significant amounts of P from supplementation
with reclaimed water and from runoff from the golf course lawns.
The differences in total sediment P among lakes were correlated
to the varied pollution extent from the lawns. One striking feature
of the artificial lake sediments was the insufficiency of NaOH-extracted
Al, which plays an important role in avoiding internal P release
during anoxia. Another characteristic was the dominance of orthophosphate
in the NaOH-EDTA extractants of the sediments, due to the heavy
external P pollution. Phytate, considered prevalent in many soils
and lake sediments, as well as polyphosphates and phosphonates
which have appeared in some natural lake sediments, was not detected.
The rank order of present biogenic P species was monoester-P＞DNA-P＞pyrophosphate＞lipid-P.
Keywords: Phosphorus; Artificial lake; Sediment; Fractionation;
Phosphorus-31 nuclear magnetic resonance (31P NMR)
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1. Introduction
2. materials and methods
2.1. Site description
2.2. Sediment sampling and analyses
3. Results
3.1. Sediment characteristics
3.2. Fractionation
3.3. 31P NMR spectroscopy
4. Discussion
4.1. Sediment P pollution
4.2. P immobilization potential
4.3. 31P NMR spectroscopy
4.4. Biogenic P species
5. Conclusions
Acknowledgements
References