Speciation of boron with Cu 2+ , Zn 2+ , Cd 2+ and Pb 2+ in 0.7 M KNO 3 and in sea-water

Details Speciation of boron with Cu 2+ , Zn 2+ , Cd 2+ and Pb 2+ in 0.7 M KNO 3 and in sea-water Speciation of boron with Cu 2+ , Zn 2+ , Cd 2+ and Pb 2+ in 0.7 M KNO 3 and in sea-water

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2613v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 12, pp.2613-2617

Computer Science

Scientific paper

The stability constants, K * MB , for borate complexes with the ions of Cu, Pb, Cd and Zn are determined in this work by DPASV in 0.7 M KNO 3 at metal concentrations of 10 -7 M. The acidity constants of the Cu 2+ ion are determined by DPASV in the same conditions. The following values for log K * MB ( * MB 2 ) have been obtained: CuB: 3.48, CuB 2 : 6.13, PbB: 2.20, PbB 2 : 4.41, ZnB: 0.9, ZnB 2 : 3.32, CdB: 1.42, and CdB 2 : 2.7, while the values for the acidity constants of Cu are pK * CuOH = 7.66 and p * Cu ( OH 2 ) = 15.91. At the low concentration of boron in 35%. S sea-water complexes with borate represent only about 0.2% Cu, 0.03% Pb, 0.02% Zn and 0.003% Cd.

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