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Effect of Humus on Activity of Mineral-Bound Hg: *** on Leachability and Transfer of Mineral-Bound Hg Under Acid Leaching Condition

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Pedosphere 2000年第1期10卷 53-60页

作者： YAOAIJUN qingchangle 等 CollegeofGeosicence ZhongshanUniversityGuangzhou510275China CollegeofResourceandEnvironment SouthwestAgriculturalUniversityChongqing400716China

Effects of humus fractions (fulvic acid, brown humic acid and grey humic acid) on the leachability and transferring activity of five types of mineral-bound Hg were investigated. Under the acid leaching condition: fulvic acid could promote leachability and vertical transference of all the mineral-bound Hg. Brown humic acid could retard the leaching and transferring processes of CaCO3-Hg, Fe2O3-Hg, MnO2-Hg and kaolinite Hg but not bentonite-Hg. Grey humic acid could greatly enhance residing ability of the mineral-bound Hg in the soil column and restrain them from vertical transferring. The effect of humus on leachability and transferring activity on the mineral-bound Hg was closely related to its ability to convert the mineral-bound Hg into organic-bound form and the transferability of the latter in the soil column. The characteristics of the mineral-bound Hg in speciation were the internal factors that determined the extent and rate of the influence of the humus.

关键词： humus leachability mineral-bound Hg transfer

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Chemical Forms of Mercury in Soils and Their Influencing Factors *1

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Pedosphere 1998年第2期8卷 175-180页

作者： qingchangle MOUSHUSEN 等 SouthwestAgriculturalUniversity Chongqing400716（China） SouthwestAgriculturalUniversity Chongqing40071

Experiments were carried out to study the transformation of mercury in soils. Results showed that Hg 2+ was immediately converted into other forms once it entered into soils. Bentonite, humus or CaCO 3 accelerated the transformation of Hg 2+ by various mechanisms. Bentonite could convert Hg 2+ into residual form eventually, and application of CaCO 3 enhanced the formation of inorganic Hg. Humus competed strongly with clay minerals for binding Hg 2+ , thus increase of soil humus content led to increased formation of organically bound Hg.

关键词： bentonite CaCO 3 humus soil Hg forms

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