B. N. Ryzhenkoa and A. E. Ryabenkob
a Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences,
ul. Kosygina 19, Moscow, 119991 Russia
e-mail: ryzhenko@geokhi.ru
b ZAO SHANECO, ul. Moskvorechye 4-3, Moscow, 115522 Russia
e-mail: shaneco.group@shaneco.ru
Received February 10, 2012; accepted March 27, 2012
Abstract—Modeling of hydrogeochemical processes in the rock–water system showed that the concentrations
of Al, Fe, Sb, Sr, and W do not exceed the MAC levels even under conditions of prolonged interaction between
water and rock minerals (R/W > 0.0001). The concentrations of As, Cd, Co, and Se are unlikely to significantly
exceed the MAC even at decreasing rates of water exchange (at increasing R/W) owing to the low concentra-
tions of these elements in the rocks of the deposit. The concentrations of Mn are likely to exceed the MAC level
under reducing conditions, while they remain well within the MAC under weakly to moderately oxidizing con-
ditions. A different situation is for Cr and S, which may be well above the MAC under oxidizing conditions and
below the MAC under reducing conditions, when weakly oxidized species of S and Cr predominate. Model and
measured concentrations of Cu, Mo, Ni, Pb, V, and Zn are generally similar to each other and to the MAC levels,
but they may considerably exceed the MAC in the case of reduction in water exchange rates (longer duration
of water–rock interaction and higher R/W). The concentrations of Cu, Mo, Ni, Pb, V, Zn, and Cr may exceed
the MAC levels in the case of the prolonged exposure of strongly disintegrated rocks to moist air, whereas the
wet environment is favorable for Mn hydroxide precipitation.
Keywords: thermodynamic modeling, water–rock system, hydrogeochemical processes, maximum allowable
concentrations
DOI: 10.1134/S0016702913110098
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