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Complexation studies of Co2+ion with orthosilicic acid

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The complexation behavior of Co2+with ortho-silicic acid (o-SA) has been studied as a function of ionic strength (I) from 0.20 to 1.00M (NaClO4) at pH 4.96±0.03 and 25 °C by solvent extraction with bis(2-ethylhexyl) phosphoric acid (HDEHP) as the extractant. The stoichiometry of the extracted species was determined to be Co(DEHP)2(HDEHP)2. Co2+forms a 1:1 complex, CoOSi(OH)3 +, as the predominant species witho-SA concentrations of 3.00. 10-4to 4.00. 10-3M. The stability constant (logb1) values for CoOSi(OH)3 +complex decrease with the increase in ionic strength. These values were fitted with the extended Debye-Huckel expression to obtain the value of logb1at I=0.00M. The effect of aging time of the o-SA solution on logb1values for CoOSi(OH)3 +complex was investigated and compared with those of the UO2OSi(OH)3 +complex.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, The Florida State University (Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai -400 085, India), Tallahassee, FL, 32306, USA

    P. N. Pathak

  2. Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, FL, 32306, USA

    G. R. Choppin

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  1. P. N. Pathak
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  2. G. R. Choppin
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Pathak, P., Choppin, G. Complexation studies of Co2+ion with orthosilicic acid. J Radioanal Nucl Chem 267, 175–182 (2005). https://doi.org/10.1007/s10967-006-0025-9

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  • DOI: https://doi.org/10.1007/s10967-006-0025-9

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