Phosphorus speciation in the sediment profile of Lake Erhai, southwestern China: Fractionation and P-31 NMR

	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
发表期刊	Journal of Environmental Sciences
卷号	25 期号:6 页码:1124-1130
摘要	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.
关键词	Phosphorus Speciation Fractionation 31p Nmr Sediment Eutrophication
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5064
专题	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
推荐引用方式 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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