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

查看全文 作　　者：Runyu [1]Zhang;Liying [1]Wang;Fengchang [2]Wu;Baoan [3]Song

机构地区：[1]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences;[2]State Environmental Protection Key Laboratory for Lake Pollution Control,Chinese Research Academy of Environmental Sciences;[3]Key Laboratory of Green Pesticide and Agricultural Bioengineering,Ministry of Education

出　　处：《Journal of Environmental Sciences》索引2013年第25卷第6期,共7页

基　　金：supported by the National Natural Science Foundation of China (No. 40903052,41273151);the National Basic Research Program (973) of China (No.2008CB418006);the opening foundation of Guizhou University (No. 2009GDGP0105) 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 31P 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(NH4ClP) < 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 31 P 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：表层沉积物磷组分中国西南地区 NMR 洱海核磁共振波谱 NAOH 氢氧化钠

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

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