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Mechanistic modeling of arsenic retention on natural red earth in simulated environmental systems
Meththika Vithanage1, Rohana Chandrajith, Athula Bandara
1Chemical Modeling Laboratory, Institute of Fundamental Studies, Kandy, Sri Lanka. meththikav@yahoo.com
Abstract:
Arsenic retention on natural red earth (hereafter NRE) was examined as a function of pH, ionic strength, and initial arsenic loading using both macroscopic and spectroscopic methods. Proton binding sites on NRE were characterized by potentiometric titrations yielding an average pH(zpc) around 8.5. Both As(III)- and As(V)-NRE surface configurations were postulated by vibration spectroscopy. Spectroscopically, it is shown that arsenite forms monodentate complexes whereas arsenate forms bidendate complexes with NRE. When 4
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