Pedosphere 10(1): 53--60, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of humus on activity of mineral-bound Hg: Ⅲ. Effect on leachability and transfer of mineral-bound Hg under acid leaching condition |
| YAO Ai-Jun1, QING Chang-Le2 and MOU Shu-Sen2 |
1 College of Geoscience, Zhongshan University, Guangxhou 510B75 (china)
2 College of Resource and Environment, Southwest Agricultural University, Chongqing 400716 (China) |
| ABSTRACT |
| 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. |
| Key Words: humus, leachability, mineral-bound Hg, transfer |
| Citation: Yao, A. J., Qing, C. L. and Mou, S. S. 2000. Effect of humus on activity of mineral-bound Hg: Ⅲ. Effect on leachability and transfer of mineral-bound Hg under acid leaching condition. Pedosphere. 10(1): 53-60. |
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