Volume 25, Issue 1, December 2018, Pages 62–75
Matini Laurent1, Moutou Joseph Marie2, Nkounkou Tomodiatounga Dominique3, and Massoumou Massolola4
1 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
2 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
3 Mechanical, Energetic and Engineering laboratory, Higher National Polytechnic School, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
4 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
Original language: English
Copyright © 2018 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.
This study assessed the groundwater quality in southeastern Brazzaville, Congo, in order to calculate iron chemical speciation. A total of twenty two groundwater samples were collected in rainy and dry seasons. Physico-chemical parameters namely pH, TDS, EC, T, D.O, TH, Alk, ORP, Ca2+, Mg2+, Na+, K+, Cl-, SO42-, HCO3-, NO3-, PO43-, F-, Fetot, Fe2+ and Fe3+ were analyzed. The results indicate acidic nature and oxidizing conditions in groundwater, contamination of groundwater by domestic sewage, water septic tanks at the sight of EC values and iron content higher than permissible limit of 0.3 mg/L in the majority of groundwater samples. Modeling of iron chemical speciation in the groundwater samples using Visual Minteq computer program revealed that the predominant species were free ionic form Fe2+ in both season followed by FeSO4(aq) for Fe(II) species. The majority of Fe(III) species were fluoro complexes FeF2+ and (FeF2)+, sulphato complex ion FeSO4+ and free ionic form Fe3+ in rainy season. The hydroxo complexes of Fe(III) are predominant in dry season.
Author Keywords: Groundwater, Iron, Chemical speciation, Modelling, Visual Minteq.
Matini Laurent1, Moutou Joseph Marie2, Nkounkou Tomodiatounga Dominique3, and Massoumou Massolola4
1 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
2 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
3 Mechanical, Energetic and Engineering laboratory, Higher National Polytechnic School, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
4 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, Marien NGouabi University, P.O. Box 69 Brazzaville, Republic of the Congo
Original language: English
Copyright © 2018 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
This study assessed the groundwater quality in southeastern Brazzaville, Congo, in order to calculate iron chemical speciation. A total of twenty two groundwater samples were collected in rainy and dry seasons. Physico-chemical parameters namely pH, TDS, EC, T, D.O, TH, Alk, ORP, Ca2+, Mg2+, Na+, K+, Cl-, SO42-, HCO3-, NO3-, PO43-, F-, Fetot, Fe2+ and Fe3+ were analyzed. The results indicate acidic nature and oxidizing conditions in groundwater, contamination of groundwater by domestic sewage, water septic tanks at the sight of EC values and iron content higher than permissible limit of 0.3 mg/L in the majority of groundwater samples. Modeling of iron chemical speciation in the groundwater samples using Visual Minteq computer program revealed that the predominant species were free ionic form Fe2+ in both season followed by FeSO4(aq) for Fe(II) species. The majority of Fe(III) species were fluoro complexes FeF2+ and (FeF2)+, sulphato complex ion FeSO4+ and free ionic form Fe3+ in rainy season. The hydroxo complexes of Fe(III) are predominant in dry season.
Author Keywords: Groundwater, Iron, Chemical speciation, Modelling, Visual Minteq.
How to Cite this Article
Matini Laurent, Moutou Joseph Marie, Nkounkou Tomodiatounga Dominique, and Massoumou Massolola, “Chemical speciation of iron in urban shallow groundwater, southeastern Brazzaville, Congo,” International Journal of Innovation and Applied Studies, vol. 25, no. 1, pp. 62–75, December 2018.
