Use of pitzer equations to examine the formation of Mercury(II) hydroxide and chloride complexes in NaClO4 media
  • 【摘要】

    The thermodynamic stability constants for the hydrolysis and formation of mercury (Hg2+) chloride complexes Hg2+ + nH(2)O = Hg(OH)(n)((2-n)+) + nH(+) beta(n) Hg2+ + nCl(-) = HgCln(2-n)+ beta(i) have b... 展开>>The thermodynamic stability constants for the hydrolysis and formation of mercury (Hg2+) chloride complexes Hg2+ + nH(2)O = Hg(OH)(n)((2-n)+) + nH(+) beta(n) Hg2+ + nCl(-) = HgCln(2-n)+ beta(i) have been used to calculate the activity coefficients for Hg(OH)(n)((2-n)+) and HgCln(2-n)+ complexes using the Pitzer specific interaction model. These values have been used to determine the Pitzer parameters for the hydroxide and chloro complexes (beta((0))(ML), beta((1))(MN) and C-ML). The values of lambda(ij) and zeta(ijk) have been determined for the neutral complexes (Hg(OH)(2) and HgCl2). The resultant parameters yield calculated values for the measured values of log beta* to +/- 0.01 from I = 0.1 to 3 m at 25 degrees C. Since the activity coefficients of Hg(OH)(n)((2-n)+) and HgCln(2-n)+ are in reasonable agreement with the values for Pb(II), we have estimated the effect of temperature on the chloride constants for Hg(II) from 0 to 300 degrees C and I = 0-6 m using the Pitzer parameters for PbCln(2-n)+ complexes. The resulting parameters can be used to examine the speciation of Hg(II) with Cl- in natural waters over a wide range of conditions. 收起<<

  • 【作者】

    Gonzalez-Davila M  Santana-Casiano JM  Millero FJ 

  • 【刊期】

    Aquatic Geochemistry SCI 2007年4期

  • 【语种】

    eng