Abstract


TEMPORAL AND VERTICAL CHANGES IN SEDIMENT P COMPOUNDS IN LAKE KASUMIGAURA, JAPAN – A 31 P NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY STUDY

Sediment is a large reservoir for both organic and inorganic phosphorus (P) but their characteristics are still unclear. We observed sediment phosphorus (P) compounds with solution 31 P nuclear magnetic resonance (31 P NMR) spectroscopy during January and August, 2012 in a shallow, eutrophic Lake Kasumigaura, Japan. Collected sediment cores were sliced along with sediment depth and separated into sediment pore water and sediment. P compounds in sediment were then extracted with NaOH and EDTA. The predominant P compound in sediment was orthophosphate, accounting for approximately 80% of NaOH-EDTA extractable P whereas organic P was less than 20%. In organic P, &alpha-glycerophosphate, &beta-glycerophosphate, ribonucleic acid-P (RNA-P), deoxyribonucleic acid-P (DNA-P), were present. These compounds are derived from phospholipids (phosphatidylcholine) and nucleotides. Along with the sediment depth, concentrations of these organic P compounds decreased; DNA-P rapidly decreased more than phospholipids and RNA-P did in sediment in Lake Kasumigaura. These compounds were related in quantity to dissolved organic P (DOP) in sediment pore water, which suggests that DOP in sediment pore water should be supplied from organic P compounds present in sediment.

Authors

Shinohara, R., National Institute for Environmental Studies, Japan, r-shino@nies.go.jp

Imai, A., National Institute for Environmental Studies, Japan, aimai@nies.go.jp

Kawasaki, N., University of Selangor, Malaysia, kawasaki@unisel.edu.my

Komatsu, K., National Institute for Environmental Studies, Japan, kkomatsu@nies.go.jp

Kohzu, A., National Institute for Environmental Studies, Japan, kohzu@nies.go.jp

Miura, S., National Institute for Environmental Studies, Japan, miura.shingo@nies.go.jp

Sano, T., National Institute for Environmental Studies, Japan, sanotomo@nies.go.jp

Satou, T., National Institute for Environmental Studies, Japan, satou.takayuki@nies.go.jp

Tomioka, N., National Institute for Environmental Studies, Japan, tomioka@nies.go.jp

Shimotori, K., National Institute for Environmental Studies, Japan, shimotori.koichi@nies.go.jp

Details

Poster presentation

Session #:144 P
Date: 5/22/2014
Time: 18:00 - 20:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 675