科研之友
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摘要
In order to investigate the spatial distribution characteristics and potential ecological risks of soil heavy metals for different land-use types in the e-waste dismantling area, the spatial distribution characteristics of heavy metals, including Cu, Zn, Cd, and Pb, were studied for different land-use types in the e-waste disposal area located Guangdong province, such as paddy field, vegetable plot, barren land, and disposal site. The mass fraction and speciation of these heavy metals had been also examined for the four different land-use types, whose potential environmental risks were further assessed by geo-accumulation index (Igeo) and Hankanson potential ecological risk index (RI), respectively. The results showed that mass fraction of Cd in four land-use types have exceeded Soil Environmental Quality Standard, in which the exceed multiple ranged from 1.42 to 94.2, highlighting the Cd pollution was the most significant among these heavy metals. For disposal site, the content of four heavy metals far exceeded the standards, increasing about 8.79, 1.38, 27.6 and 6.20-fold of the standard values for Cu, Zn, Cd, and Pb, respectively. Furthermore, the ecological risk of different land-use types ranged from 165 (barren land) to 2 587 (disposal site), with the disposal site reaching a very strong risk and the others reaching at a medium risk, respectively. These results could provide scientific basis and theoretical reference for the prevention and remediation of heavy metal pollution in the soil, especially for the electronic waste disposal area.
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