An innovative approach for sequential extraction of phosphorus in sediments: Ferrous iron P as an independent P fraction
| العنوان: | An innovative approach for sequential extraction of phosphorus in sediments: Ferrous iron P as an independent P fraction |
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| المؤلفون: | Sen Gu, Gérard Gruau, Jiao Yang, Gilles Pinay, Qingman Li, Qian Yiguang |
| المساهمون: | Institute of Hydrobiology [Wuhan], Chinese Academy of Sciences [Beijing] (CAS), Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Observatoire des Sciences de l'Univers de Rennes (OSUR), Géosciences Rennes (GR), Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1), 41373099, National Natural Science Foundation of China, 2015LH0044, CPSF-CAS Joint Foundation, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) |
| المصدر: | Water Research Water Research, IWA Publishing, 2016, 103, pp.352-361. ⟨10.1016/j.watres.2016.07.058⟩ Water Research, 2016, 103, pp.352-361. ⟨10.1016/j.watres.2016.07.058⟩ |
| بيانات النشر: | Elsevier BV, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Geologic Sediments, Environmental Engineering, 010504 meteorology & atmospheric sciences, Iron, Geochemical process, 010501 environmental sciences, 01 natural sciences, Redox, Geochemical cycle, Ferrous, Component analysis, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Phosphorus fractionation, SEDEX, Waste Management and Disposal, Dissolution, 0105 earth and related environmental sciences, Water Science and Technology, Civil and Structural Engineering, Minerals, Chemistry, Ecological Modeling, Sediment, Phosphorus, Pollution, Lakes, Environmental chemistry, Ferrous iron phosphorus, Vivianite, Sedimentary rock |
| الوصف: | International audience; Accurate identification of phosphorus (P) forms is crucially important for understanding the geochemical cycle of P; however, until now the role of ferrous iron P (Fe(II)-P) buried in sediments has been completely ignored in nearly all sequential extraction procedures developed. Using sediment cores sampled from Donghu Lake in Wuhan, China, this study explored a modified version of widely used sequential P extraction method (SEDEX; Ruttenberg, 1992) in which Fe(II)-P was identified as an independent fraction. Based on the high selectivity of the extractant (0.2% 2,2′–bipyridine+0.1 M KCl) and the dissolution equilibrium of P, procedures for extracting Fe(II)-P were optimized using a 1:100 solid:liquid ratio and extraction at 50 ± 1 °C for 24 h. The sedimentary P extracted was divided into five fractions: loosely-bound P, Fe(II)-P, CDB-P, Ca-P and O-P. Fe(II)-P was the predominant fraction in fresh sediments in Donghu Lake, accounting for 15.7–49.9% of TP, with a mean of 31.6%. The mean values of Ca-P, O-P, CDB-P and loosely-bound P were 28.4%, 22.7%, 17.1% and 4.3%, respectively. Combined with component analysis of extracts and recovery experiments of standard reference minerals (vivianite, Fe3(PO4)2·8H2O) in natural sediments, extraction of Fe(II)-P with 0.2% 2,2-bipridine and 0.1 M KCl was robust, with a good recovery rate (88.7–100.6%) and little of the Ca-P dissolved. It is possible to use this innovative SEDEX not only to distinguish the contribution of different P matrices in fresh sediments, but also to investigate the transformation of sedimentary P under different redox conditions. Therefore, greater focus on Fe(II)-P is necessary, because it is a major sink for the geochemical process of sedimentary P. |
| تدمد: | 0043-1354 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5888ba0119d6458473bb4323bfdab974Test https://doi.org/10.1016/j.watres.2016.07.058Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....5888ba0119d6458473bb4323bfdab974 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00431354 |
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