| Phosphorus speciation in the sediment profile of Lake Erhai, southwestern China: Fractionation and P-31 NMR | |
Runyu Zhang ; Liying Wang; Fengchang Wu; Baoan Song
| |
| 2013 | |
| Source Publication | Journal of Environmental Sciences
 |
| Volume | 25Issue:6Pages:1124-1130 |
| Abstract | The distribution characteristics of phosphorus (P) forms in the sediment profile of Lake Erhai, in southwestern China has been investigated by sequential extraction and P-31 nuclear magnetic resonance spectroscopy (NMR) of NaOH extracts to understand P dynamics and its potential contribution to lake eutrophication. Contents of P fractions varied in the order of NH4Cl extracted P (H4Cl-P) < bicarbonate-dithionite extracted P (BD-P) < HCl-P, Residual-P < NaOH extracted P (NaOH-P). The highly available NH4Cl-P represented less than 1% of total P (TP). BD-P and NaOH extracted reactive P (NaOH-rP) averaged 39%, while the ratio of Fe/P was higher than 15, indicating low P release from the sediments under permanent oxic condition. The less bio-available HCl-P, NaOH extracted nonreactive P (NaOH-nrP) and residual-P contributed 61% of TP. Regression analysis revealed that BD-P, NaOH-rP and HCl-P were positively correlated with the contents of Fe and Mn, Al and Fe, and Ca, respectively. The investigation of P compound groups in NaOH extracts by 31P NMR showed that ortho-P and monoester-P were the largest two constituents of the P pool, followed by diester-P, phosphonate and pyro-P. A comparison of vertical variations of P groups in the sediment profile suggested that these compounds were involved in the P recycling to different extents in Lake Erhai. In particular, the lake exhibits high potential for labile P release from the surface sediments, which should be taken into consideration even after the outsourced P runoff ceased. |
| Keyword | Phosphorus Speciation Fractionation 31p Nmr Sediment Eutrophication |
| Subject Area | 环境地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5064 |
| Collection | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 环境地球化学国家重点实验室 |
| Recommended Citation GB/T 7714 | Runyu Zhang,Liying Wang,Fengchang Wu,et al. Phosphorus speciation in the sediment profile of Lake Erhai, southwestern China: Fractionation and P-31 NMR[J]. Journal of Environmental Sciences,2013,25(6):1124-1130. |
| APA | Runyu Zhang,Liying Wang,Fengchang Wu,&Baoan Song.(2013).Phosphorus speciation in the sediment profile of Lake Erhai, southwestern China: Fractionation and P-31 NMR.Journal of Environmental Sciences,25(6),1124-1130. |
| MLA | Runyu Zhang,et al."Phosphorus speciation in the sediment profile of Lake Erhai, southwestern China: Fractionation and P-31 NMR".Journal of Environmental Sciences 25.6(2013):1124-1130. |
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