Saturday, 15 July 2006

Fractionation and Potential Mobility of Heavy Metals in Tailings and Paddy Soils near Abandoned Metalliferous Mines.

Goo-Bok Jung, Won-Il Kim, Jong-Sik Lee, Jin-Ho Kim, and Mun-Hwan Koh. National Institute of Agricultural Science and Technology, Seodun Dong #249, Suwon, South Korea

Most of the tailings have been left without any management in their mines and have become the main source of serious environmental problems in nearby groundwater, stream and cultivated lands. To compare fractionation and potential mobility of heavy metals in tailings and paddy soils near abandoned 10-metalliferous mines in Korea, the distribution and chemical fractions of heavy metal and their mobility in relation to chemical compositions were investigated. The pollution index of heavy metal in mine tailing calculated with the permissible levels were in the order Cheongyang>Dogok>Beutdeun>Baegwoul mine, which were considered sufficient to raise environmental problems. The rates of 0.1M-HCl extractable Cd, Cu, Pb, Zn, and Ni to total content in paddy soils were 49.1, 50.7, 26.8, 18.4 and 2.9%, respectively, and their rates of heavy metals in paddy soils were higher than those of mine tailing. Dominant chemical forms of heavy metals in tailings were sulfide and residual form (63`91%), specially, the exchangeable portion of Cd (21%) were relatively higher than that of other metals in paddy soils. The mobility factor of heavy metals in tailings and paddy soils was in the order Cd>Zn>Cu>Pb, and the mobility factor in tailing varied considerably among mines. The potential mobility of heavy metals in tailings showed significant positive correlation with water-soluble Al3+ and Fe3+ contents, while in paddy soils, it correlated negatively with soil pH values. Key words : Metalliferous Mine, Tailing, Paddy soil, Heavy metal, Fractionation, Potential mobility

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