The absorption of elemental Hg vapor into aqueous solution
containing Hg(II) was measured in
a stirred cell contactor at 25 and 55 °C. In 0.8 M
HNO3, the reaction is first-order in Hg and
Hg(II), respectively. The overall second-order rate constant
is given by k
2 = 2.90 × 109
×
exp(−1765/T). In 0.8 M HNO3 with the
addition of H2O2, the reaction is first-order
in Hg, H2O2,
and Hg(II), respectively. The overall third-order rate
constant is given by k
3 = 2.13 ×
1023 ×
exp(−10110/T). The addition of Fe2+ or
Fe3+ has no immediate effect on mercury removal.
In
0.8 M HNO3 with the addition of
K2Cr2O7, the reaction is
first-order in Hg, Cr2O7
, and
Hg(II),
respectively. The overall third-order rate constant is 4.3 ×
108 M-2
s-1 at 25 °C. For mercury
absorption in Hg(II) obtained by HgCl2 injection, the
presence of HNO3 greatly enhanced Hg
absorption. H2SO4 had a comparable
positive effect while HCl had a negative effect.
Succinic
acid−NaOH buffer solution greatly enhanced Hg absorption in
Hg(II), but NaHCO3−NaOH
inhibited Hg absorption in Hg(II). MnSO4 mildly
enhanced Hg absorption in Hg(II). At
MnSO4
concentrations lower than 0.22 M, a constant overall third-order rate
constant of 4.4 × 107
M-2
s-1 was obtained at 25 °C. NaCl,
MgSO4, FeCl3, CaCl2, and
MgCl2 all inhibited Hg absorption
in Hg(II). Under most conditions, oxygen in the gas phase did
not have any effect on Hg
absorption in Hg(II). However, oxygen had a positive effect
on Hg absorption in Hg(II) when
HCl or NaHCO3/NaOH was present in the
solution.
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