期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 46, 期 19, 页码 10572-10578出版社
AMER CHEMICAL SOC
DOI: 10.1021/es301887z
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资金
- Japan Society for the Promotion of Science [23860066]
- GEMS/Water Trend Monitoring Project at Lake Kasumigaura
- Grants-in-Aid for Scientific Research [23860066] Funding Source: KAKEN
Differences in biogenic phosphorus (P) compounds between sediment and suspended particles in aquatic environments are important for understanding the mechanisms of internal P loading, but these differences are still unknown. We used solution-state P-31-nuclear magnetic resonance spectroscopy (P-31 NMR) with NaOH-ethylenediaminetetraacetic extraction to detect the multiple P compounds in suspended particles and sediment in the eutrophic Lake Kasumigaura, including orthophosphate monoesters, orthophosphate diesters, pyrophosphate, and polyphosphate. We tested the hypothesis that there is a significant difference between these groups in suspended particles and sediment. Biogenic P other than orthophosphate was found in significantly higher proportions in suspended particles (74.3% of total P) than in sediment (25.6%). Orthophosphate monoesters were comparatively more abundant in suspended particles, as indicated by the ratio of orthophosphate diesters to monoesters (average, 0.31 for suspended particles; 1.05 for sediment). The compounds identified as orthophosphate monoesters by P-31 NMR spectroscopy originated mainly from phospholipids (a-glycerophosphate and beta-glycerophosphate) and ribonucleic acid (RNA-P), whereas the orthophosphate diesters included mostly DNA (DNA-P). These results suggest that the dynamics of orthophosphate diesters, the production of DNA-P, or the degradation of phospholipids, play an important role in P cycling in Lake Kasumigaura.
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