摘要

Laboratory simulation experiments were conducted to develop the cumulative process and kinetics of different chemical speciation of soil Hg in a gold field of mercury pollution in Fu Jian Province, the effect of environmental conditions, such as pH value, organic matter on mercury accumulation were also investigated. The results indicated that two-constant equation, pseudo-second order equation and hyperbolic diffusion equation could be fitted to the cumulative process of mercury. The accumulation rates of the exchangeable and carbonate Hg were faster than the other three forms. However, Hg in soil was eventually bound to oxidizable form, followed by residual, exchangeable and carbonates forms. Under the weak acid and neutral conditions of pH values greater than 5, or soil organic matter content ranging from 3.0%similar to 4.6%, the accumulation capacity of mercury increased with higher pH values and soil organic matter. Moreover, the most active exchangeable Hg was more easily transformed to the relatively stable forms, which could delay the formation of mercury delayed geochemical hazard in soil.