Journal of Food, Agriculture and Environment

Transport of heavy metals in surface runoff from contaminated soil under simulated rainfall

Author(s):

Ji-Yu Wang ^1,2, Dao-You Huang ¹, Qi-Hong Zhu ¹*, Ying-Bing Tian ², Shou-Long Liu ¹, Zun-Chang Luo ³, Han-Hua Zhu ¹, Shuai Wang ¹, Da-E Liu ⁴

Recieved Date: 2013-07-28, Accepted Date: 2013-10-10

Abstract:

Heavy metals transported by surface runoff from contaminated soils may jeopardise aquatic ecosystems and increase the dispersal of the heavy metal pollution. The transport mechanism for heavy metals during rainfall-runoff events has rarely been studied. An experimental system was established to simulate the runoff pollution process on heavy metals contaminated fluvo-aquic soil with different slopes (3°, 5° and 10°). The temporal changes of dissolved and total Cd, Pb, Cu and Zn concentrations in surface runoff samples were investigated. The total concentrations of Cd, Pb, Cu and Zn in runoff were sharply reduced within the first 20 min after surface runoff commenced and then remained stable. During the runoff process, the dissolved Pb in runoff was lower than the detection limit. For Cd and Zn, the proportions of the dissolved forms were less than 20% of the total concentrations in runoff during the first 10 min after runoff commenced, and these proportions increased to approximately 40% at their maxima. A gradual increase from 40% to 70% dissolved Cu was observed during the runoff processes. Furthermore, a steeper slope (from 3° and 5° to 10°) significantly increased the total concentrations of heavy metals in runoff and decreased the proportions of dissolved Cd and Zn, but had no significant effect on the proportions of dissolved Pb and Cu. To minimise the transport of heavy metals in contaminated soils by runoff, strategies should aim to decrease both particulate and dissolved Cu, Cd and Zn.

Keywords:

Cadmium, copper, lead, zinc, simulated rainfall, slope, surface runoff

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2696-2701

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