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International Journal of Innovation and Applied Studies
ISSN: 2028-9324     CODEN: IJIABO     OCLC Number: 828807274     ZDB-ID: 2703985-7
 
 
Friday 14 December 2018

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  Call for Papers - February 2019     |     Now IJIAS is indexed in EBSCO, ResearchGate, ProQuest, Chemical Abstracts Service, Index Copernicus, IET Inspec Direct, Ulrichs Web, Google Scholar, CAS Abstracts, J-Gate, UDL Library, CiteSeerX, WorldCat, Scirus, Research Bible and getCited, etc.  
 
 
 

Chemical speciation of iron in urban shallow groundwater, southeastern Brazzaville, Congo


Volume 25, Issue 1, December 2018, Pages 62–75

 Chemical speciation of iron in urban shallow groundwater, southeastern Brazzaville, Congo

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 Laboratory of Applied Mineral Chemistry, Sciences and Techniques Faculty, 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

Received 25 May 2018

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.