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Shinohara, R., National Institute for Environmental Studies, Tsukuba, Japan, r-shino@nies.go.jp
Imai, A., National Institute for Environmental Studies, Tsukuba, Japan, aimai@nies.go.jp
Kawasaki, N., National Institute for Environmental Studies, Tsukuba, Japan, kawasaki.nobuyuki@nies.go.jp@nies.go.jp
Komatsu, K., National Institute for Environmental Studies, Tsukuba, Japan, kkomatsu@nies.go.jp
Kohzu, A., National Institute for Environmental Studies, Tsukuba, Japan, kohzu@nies.go.jp
Miura, S., National Institute for Environmental Studies, Tsukuba, Japan, miura.shingo@nies.go.jp
Sato, T., National Institute for Environmental Studies, Tsukuba, Japan, satou.takayuki@nies.go.jp
Tomioka, N., National Institute for Environmental Studies, Tsukuba, Japan, tomioka@nies.go.jp

PHOSPHORUS FORMS IN SUSPENDED PARTICLES AND SEDIMENT IN LAKE KASUMIGAURA: A 31P NMR STUDY

Difference between biogenic phosphorus (P) forms in suspended particles and sediment in the heavily eutrophic Lake Kasumigaura is largely unknown; we analyzed biogenic P forms in suspended particles and sediment samples by using a 31P nuclear magnetic resonance spectroscopy (31P NMR). Solution 31P NMR with NaOH-EDTA extraction detects mainly four forms, orthophosphate, orthophosphate monoester, orthophosphate diester, and pyrophosphate. We tested the hypothesis that there is a significant difference in biogenic P forms between the suspended particles and the sediment. Biogenic P forms in suspended particles, organic P forms other than orthophosphate, possessed more than 74% of the NaOH-EDTA extractable P. The biogenic P content in sediment (~30%) was significantly lower than that in suspended particles. Orthophosphate monoester was the major group of the biogenic P in suspended particles, whereas it was relatively lower in sediment. Since orthophosphate is the dominant P form in the sediment, these differences in biogenic P content between suspended particles and sediment imply that the mechanism differs between them in supplying soluble reactive P to the overlying water.

Oral presentation

Session #:SS52
Date: 7/09/2012
Time: 14:15