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Mobility and fractionation of copper in sandy soils

Sun, Q.; Li, T.; Alva, A. K.; Li, Y.C.

Environmental Pollutants and Bioavailability 31(1): 18-23

2019


ISSN/ISBN: 2639-5932
DOI: 10.1080/09542299.2018.1558114
Accession: 070987089

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The transport and fractionation of copper (Cu) were investigated in three soils which were under continuous citrus production for over 30 years. The above soils received 50 kg Cu ha(-1), and were leached with eight pore volumes of water (equivalent to a total of 91 cm of rainfall). Following the completion of leaching, the leaching columns were sectioned into 5 cm depth increments for analyses of soil Cu. Concentrations of different forms of soil Cu were analyzed using a sequential fractionation procedure. The leaching column study indicated as much as 98% of the applied Cu remained in the upper 5 cm of the soil despite leaching eight pore volumes of water. Copper recovered in eight pore volumes of leachate accounted for 0.18-2.87% of Cu applied. The organically bound and precipitated forms of Cu accounted for 33-87% and 6-44% of total soil Cu, respectively.

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