The stability of UO 2 OH + and UO 2 [HPO 4 ] 2- 2 complexes at 25°C

Details The stability of UO 2 OH + and UO 2 [HPO 4 ] 2- 2 complexes at 25°C The stability of UO 2 OH + and UO 2 [HPO 4 ] 2- 2 complexes at 25°C

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1747d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 11, pp.1747-1751

Computer Science

Scientific paper

The cumulative association constant ( 2 ) for the geochemically important aqueous complex UO 2 [HPO 4 ] 2- 2 has been determined by potentiometric titration in Na 2 HPO 4 -UO 2 (NO 3 ) 2 solutions in the pH range 3.9-4.7, at ionic strengths below 0.024 molal with the Newton-Raphson method used to compute 2 from the chemical analytical data. Based on 25 measurements we obtain log 2 = 18.3 ± 0.2 at 25°C. From the same experiments we compute that the association constant of UO 2 OH + is 8.9 ± 0.1, in disagreement with the value of 8.3 ± 0.3 for this constant given by Baes and Mesmer (1976).

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