International Journal of Environmental Sciences

Volume 7 Issue 4 2017- January 2017 Pages: 280- 289          Next >>                    

Study on speciation and effect of ionic strength on U Migration in Mineral-Water system

Author Information:

Sabyasachi Rout, Sarjan Singh, Ajay Kumar, P. M. Ravi, R. M. Tripathi -
Health Physics Division, Bhabha Atomic Research Centre, Mumbai, India-400085


An experiment was designed to study the speciation of uranium (U) at mineral-water interface and to study the effect of ionic strength (IS) of different salts on the migration of U from solid to liquid phase both in binary system (Mineral-water) and ternary system (Mineral-Water-Humic Acid). For the study ores bearing U-minerals differ in their host rocks were chosen and mineralogical study was carried out using XRD.  All the experiments were designed taking ore to water in the ratio 1g:10 mL. Speciation study of U in aqueous phase using speciation code MEDUSA revealed that (UO2)2 CO3(OH)3-, UO2(CO3)22-, UO2(CO3)34-, UO2CO3, UO2(OH)2, and UO2OH+ are the predominate species for both the systems. Study of speciation of U in terms of oxidation states indicates that about 5.4% of total U exist as U(VI) in ore A and reaming 94.6% in U(IV) state, whereas in Ore B about 9% of total U exist as U(VI) and reaming  91% in U(IV) state. Study of ionic strength versus desorption of U reveals that, there occurs an increase in U desorption from both the Ore A and B with increase in IS of the aqueous phase.  Ca2+ salts induces desorption more in comparisons to Na+ salt and among anions NO3- salts causes more desorption in comparison to Cl- salts. Study of ternary system (Ore-Water -Humic acid) revealed that, presence of humic acid (HA) accelerate the desorption in the experimental range of IS of all salts except in case of Ca-salts at higher ionic strength the U concentration reduces in aqueous phase of ternary system

Keywords: U, Ionic Strength, Speciation, Migration.


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