[ Extractions Séquentielles du phosphore des sédiments Aquatiques : Cas des principaux Oueds de la région de Meknès ]
Volume 13, Issue 1, January 2015, Pages 72–82
Hind Omari1, Adil Lammini2, Ali Dehbi3, and Abdelaziz Abdallaoui4
1 Département de Chimie, Université Moulay Ismail, Faculté des Sciences, Chimie Analytique et Environnement, Meknès, Morocco
2 Département de Chimie, Université Moulay Ismail, Faculté des Sciences, Chimie Analytique et Environnement, Meknès, Morocco
3 Département de Chimie, Université Moulay Ismail, Faculté des Sciences, Chimie Analytique et Environnement, Meknès, Morocco
4 Department of Chemistry, Analytical Chemistry and Environment Team, Moulay Ismail University, Faculty of Science, BP. 11201, Zitoune Meknes, Morocco
Original language: French
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The use of water from streams depends on their quality in often degraded by excessive nutrient loads such as phosphorus. The study of this nutrient by a method of sequential analysis in sediments aims to provide information on environmental quality, while determining the form of bioavailable phosphorus.
This work aims to put the focus on the different forms phosphorus could be found in the aquatic sediments of the main rivers in the region of Meknes (Morocco).
The determination of total phosphorus level in sediments is made using spectrophotometry applied on the supernatant after mineralization of the sediment with (H2SO4/K2S2O8) according to ammonium molybdate method using ascorbic acid as reagent. The chemical fractioning of phosphorus in the sediment is done following the Golterman fractionation scheme that uses EDTA as specific chelating agent that extract the mineral fraction without disturbing the organic phosphorus by adjusting the pH of extracting solutions to that of the sediment.
This scheme will allow us to determine the proportions of five forms of phosphorus: water-soluble phosphorus (o-P), iron-bound phosphorus (Fe (OOH)-P), calcium-bound phosphorus (CaCO3-P), acid-soluble organic phosphorus (ASOP) and residual organic phosphorus (ROP).
The results of these extractions showed that the sediment phosphorus of studied samples is mainly under its mineral form [Fe(OOH)-P + CaCO3-P]. These forms represent around 77% of total phosphorus with a predominance of the CaCO3-P fraction. The organic forms (ASOP + ROP) represent only 23%.
Author Keywords: Sediment, watercourse, phosphorus forms, chemical fractionation.
Volume 13, Issue 1, January 2015, Pages 72–82
Hind Omari1, Adil Lammini2, Ali Dehbi3, and Abdelaziz Abdallaoui4
1 Département de Chimie, Université Moulay Ismail, Faculté des Sciences, Chimie Analytique et Environnement, Meknès, Morocco
2 Département de Chimie, Université Moulay Ismail, Faculté des Sciences, Chimie Analytique et Environnement, Meknès, Morocco
3 Département de Chimie, Université Moulay Ismail, Faculté des Sciences, Chimie Analytique et Environnement, Meknès, Morocco
4 Department of Chemistry, Analytical Chemistry and Environment Team, Moulay Ismail University, Faculty of Science, BP. 11201, Zitoune Meknes, Morocco
Original language: French
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The use of water from streams depends on their quality in often degraded by excessive nutrient loads such as phosphorus. The study of this nutrient by a method of sequential analysis in sediments aims to provide information on environmental quality, while determining the form of bioavailable phosphorus.
This work aims to put the focus on the different forms phosphorus could be found in the aquatic sediments of the main rivers in the region of Meknes (Morocco).
The determination of total phosphorus level in sediments is made using spectrophotometry applied on the supernatant after mineralization of the sediment with (H2SO4/K2S2O8) according to ammonium molybdate method using ascorbic acid as reagent. The chemical fractioning of phosphorus in the sediment is done following the Golterman fractionation scheme that uses EDTA as specific chelating agent that extract the mineral fraction without disturbing the organic phosphorus by adjusting the pH of extracting solutions to that of the sediment.
This scheme will allow us to determine the proportions of five forms of phosphorus: water-soluble phosphorus (o-P), iron-bound phosphorus (Fe (OOH)-P), calcium-bound phosphorus (CaCO3-P), acid-soluble organic phosphorus (ASOP) and residual organic phosphorus (ROP).
The results of these extractions showed that the sediment phosphorus of studied samples is mainly under its mineral form [Fe(OOH)-P + CaCO3-P]. These forms represent around 77% of total phosphorus with a predominance of the CaCO3-P fraction. The organic forms (ASOP + ROP) represent only 23%.
Author Keywords: Sediment, watercourse, phosphorus forms, chemical fractionation.
Abstract: (french)
L'utilisation des eaux des cours d'eau dépend étroitement de leur qualité souvent dégradées par des charges excessives en éléments nutritifs tel que le phosphore. L'étude de cet élément nutritif par une méthode d'analyse séquentielle dans les sédiments a pour objectif d'apporter des informations sur la qualité du milieu, tout en déterminant la forme de phosphore biodisponible.
Ce travail a pour but de faire le point sur les différentes formes sous lesquelles se présente le phosphore dans les sédiments aquatiques des principaux oueds de la région de Meknès (Maroc).
La détermination des teneurs en phosphore total des sédiments se fait par l'analyse spectrophotométrique des surnageants récupérés après la minéralisation des sédiments par (H2SO4/K2S2O8), selon la méthode de molybdate d'ammonium et en utilisant l'acide ascorbique comme réactif. Le fractionnement chimique du phosphore dans le sédiment est réalisé en suivant le schéma de fractionnement de Golterman, qui utilise l'EDTA comme chélateur spécifique, destiné à extraire la fraction minérale sans perturber le phosphore organique en ajustant le pH des solutions extractantes à celui de sédiment.
Ce schéma nous a permi de déterminer les proportions de cinq formes du phosphore : le phosphore soluble dans l'eau (o-P), le phosphore lié au fer (Fe(OOH)-P), le phosphore lié au calcium (CaCO3-P), le phosphore organique soluble dans l'acide (POSA),et le phosphore organique résiduel (POR).
Les résultats de ces extractions ont montré que le phosphore sédimentaire des échantillons étudiés est essentiellement sous la forme minérale [Fe(OOH)-P + CaCO3-P]. Ces formes représentent près de 77 % en moyenne du phosphore total, avec la prédominance de la fraction CaCO3-P. Les formes organiques (POSA + POR) représentent seulement 23%.
Author Keywords: Sédiment, cours d'eau, formes de phosphore, fractionnement chimique.
How to Cite this Article
Hind Omari, Adil Lammini, Ali Dehbi, and Abdelaziz Abdallaoui, “Sequential Extraction of Aquatic Sediment Phosphorus : Case of the main Rivers in the Area of Meknes,” International Journal of Innovation and Scientific Research, vol. 13, no. 1, pp. 72–82, January 2015.
