Competitive sorption of intermixed heavy metals in water repellent soil in Southern Australia |
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Authors: | P J Li F Stagnitti X Xiong P Li |
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Institution: | (1) Department of Pollution Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, PO Box 417, No. 72, Wenhua Road, Shenyang, 110016, China;(2) School of Life and Environmental Sciences, Deakin University, PO Box 423, Warrnambool, VIC, 3280, Australia;(3) Fujian Institute of Research on the Structure of Matter, The Chinese Academy Sciences, Fuzhou, 350002, China;(4) Graduate University of Chinese Academy of Science, Beijing, 100039, China |
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Abstract: | In water repellent soil, Cr, Pb and Cu showed higher adsorption intensities than Zn, Cd and Ni did. Soil water repellency
is much more widespread than formerly thought. In order to promote fertility and productivity, the irrigation of recycled
water onto water repellent soil may be an applied technology to be used in some areas of Southern Australia. Therefore, heavy
metals in recycled water potentially enter into the soil. The competitive sorption and retention capacity of heavy metals
in soil are important to be determined, especially considering the special geochemical origin of water repellent soil that
was caused by waxes on or between the soil particles. Batch equilibrium sorption experiments on Cd, Cr, Cu, Ni, Pb and Zn
in their typical proportion in recycled water were conducted in water repellent soil. The sorption intensity, sorption isotherm
in the experiments together showed that Cr, Pb and Cu have higher sorption intensity than those of Zn, Ni and Cd in the competitive
system. The risk assessment for the application of recycled water onto water repellent soil is definitely necessary, especially
for the metal cations with relatively weak sorption. |
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Keywords: | Water repellent soil Heavy metal Competitive sorption Recycled water Adsorption equation Australia |
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