Simultaneous Studies of Redox Reaction of Chromium(VI) and Arsenic(III) in Aqueous Phase: A Kinetic and Mechanistic Approach

Main Article Content

Iorhuna, T. Boniface
Wuana, A. Raymond
Yiase, G. Stephen


A kinetic and mechanistic approach was used to simultaneously study the oxidation of As(III) and reduction of Cr(VI) in aqueous phase, and in the presence of Fe(III). Reactions were monitored by UV-visible spectrophotometry. The stoichiometry of the reaction was 11111111.PNG. The rate equation for the reaction is proposed as 2222221.PNG where k2 is the second order rate constant. The reaction was not affected by Fe(III) ions within the studied concentration range of 0.001 – 0.009 molL-1. From the reaction between  3331.PNG a plausible mechanism involving an ester formation by the reactants leading to the eventual formation of As(V) and Cr(III) was proposed.

Oxidation-reduction, arsenic(III), chromium(VI), kinetics, mechanism

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How to Cite
Boniface, I. T., Raymond, W. A., & Stephen, Y. G. (2020). Simultaneous Studies of Redox Reaction of Chromium(VI) and Arsenic(III) in Aqueous Phase: A Kinetic and Mechanistic Approach. Asian Journal of Chemical Sciences, 7(2), 18-29.
Original Research Article


Ramakrishnaiah CR, Prathima B. Hexavalent chromium removal from industrial wastewater by chemical precipitation method. International Journal of Engineering Research and Applications (IJERA). 2012;2(2):599-603.

Duffus JH. Heavy metals-a meaningless term? International Union of Pure and applied Chemistry, 2002;74(5):793–807.

Arruti A, Fernández-Olmo I, Irabien A. Evaluation of the contribution of local sources to trace metals levels in urban PM2.5 and PM10 in the Cantabria region (Northern Spain). Journal of environmental monitoring, 2010;12(7):1451–1458.

Dönmez G, Aksu Z. Removal of chromium (VI) from saline wastewaters by Dunaliella species. Research Journal of Environ-mental Toxicology, 2002;38(5):751–762.

Wilkie JA, Hering JG. Rapid oxidation of geothermal arsenic (III) in stream waters of the Eastern Sierra Nevada, Environmental Science and Technology. 1998;32:657–662.

Charalampos V, Ifigenia M, Ecconomou-Eliopoulos M, Loannis M. Hexavalent chromium and other toxic elements in natural waters in the Thiva – Tanagra – Malakasa Basin, Greece. Hellenic Journal of Geosciences. 2008;43:57–56.

Namies´nika J, Rabajczykb A. The speciation and physico-chemical forms of metals in surface waters and sediments, Chemical Speciation and Bioavailability. 2010;22(1):1-25

Xiaoling D, Lena Q, Mab JG, Willie H, Yuncong L. Enhanced Cr (VI) reduction and As (III) oxidation in ice phase: Important role of dissolved organic matter from biochar. Journal of Hazardous Materials, 2014;267:62–70.

Adejo SO, Yiase SG, Ukoha PO, Iorhuna BT, Gbertyo JA. Oxidation-reduction reaction of chromium(VI) and iron(III) with paracetamol: Kinetics and mechanistic studies. Archives of Applied Science Research. 2014;6(5):56-67.

Verma RM. Analytical chemistry, theory and practice. CBS publishers and distributors PVT Ltd, India. 2010;358-61.

Amira HK, Samah FE, Sherin FH. A review on UV spectrophotometric methods for simultaneous multicomponent analysis, European Journal of Pharmaceutical and Medical Research. 2016;3(2):348-360.

Dionisio B, Diego G, Jaqueline LP, Juliane RO, Karina GA, Rodolfo LC. Kinetic and thermodynamic parameters of biodiesel oxidation with synthetic antioxidants: simplex centroid mixture design, Journal of Brazilian Chemical Society. 2014;25(11): 32-40.

Ong LK, Kurniawan A, Suwandi AC, Lin CX, Zhao XS, Ismadji S. Transesterification of leather tanning waste to biodiesel at supercritical condition: Kinetics and thermodynamics studies, The Journal of Supercritical Fluids. 2013;75: 11–20.

Cheong-Song C, Jin-Woo K, Cheol-Jin J, Huiyong K, Ki-Pung Y. Transesterification kinetics of palm olein oil using supercritical methanol. The Journal of Supercritical Fluids. 2011;58(3):365–370.

Iyun JF, Shehu AR. Kinetics and mechanism of the oxidation of ethanol and propanol by chromium(VI) in acidic medium. Chemclass Journal. 2004;12:55-58.

Ajmal M, Nomani AA, Ahmad A. Acute toxicity of chrome electroplating wastes to microorganisms: adsorption of chromate and chromium(VI) on a mixture of clay and sand, Water, Air, and Soil Pollution. 1984;23(2):119–127.

Brookins DG. E-pH Diagrams for Geochemistry. Springer-Verlag, Berlin, Germany; 1988.

Atkins P, De paula J. Physical Chemistry, 7th ed. Oxford University Press. New Delhi. 2000;960-62.

Smedley PL, Kinniburg DG. A review of the source, behavior and distribution of arsenic in natural waters, Applied Geochemistry. 2002;17:517-568.

Schroeder DC, Lee GF. Potential transformation of chromium in natural waters, Water, Air and Soil Pollution. 1975; 4:355–365.

Hughes-Jones NC, Gardner B, Telford B. the Effect of pH and Ionic Strength on the Reaction between Anti-D and Erythrocytes, Immunology. 1964;7:72-81.

Cantu Y, Remes A, Reyna A, Martinez D, Villarreal J, Ramos H, et al. Thermodynamics, kinetics and activation energy studies of the sorption of chromium(III) and chromium(VI) to a Mn3O4 nanomaterials. Chemical Engineering Journal. 2014;254(15):374-383.

Cotton FA, Wilkison G. Advanced inorganic chemistry; A comprehensive text. 3rd Ed. Wiley Eastern Ltd, New Delhi. 1978;818-870.

Pacyna JM, Pacyna EG. An assessment of global and regional emissions of trace metals to the atmosphere from anthropogenic sources worldwide, Environ-mental Review. 2001;9(4):269-298.

Kumar P. Study of effect of variation of ionic strength of the medium on velocity constant of Ru(III) catalyzed oxidation of hydroxyl benzoic acids by chloramine-T in acidic medium. Oriental Journal of Chemistry, 2013;29(4):23-28.

Attia AA, Khedr SA, Elkholy SA. Adsorption of chromium ion (VI) by acid activated carbon, Brazilian Journal of Chemical Engineering. 2010;27(1):45-59.