A study on the characteristics of heavy metals in orange ecosystem |
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| Authors: | Qilin Li Chaofu Wei Yun Huang Liwei Wang Dingyong Wang |
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| Institution: | [1]College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650092, China [2]College of Resources and Environment, Southwest University, Chongqing 400716, China [3]Chongqing Agricultural Food Quality and Safety Center, Chongqing 400020, China [4]Chongqing Monitoring Station of Agricultural Environmental Protection, Chongqing 400020, China |
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| Abstract: | An investigation was conducted to identify the characteristics of heavy metals in orange ecosystem in three areas in the Three
Gorge Reservoir Region by using the modified Tessier sequential extraction procedure. The contents of Cu and Pb in different
speciation fractions of the soils can be ordered as the Residual (F6)>Reducible (F4)>Oxidable (F5)>Water soluble (F1)>Carbonate
(F3)>Exchangeable (F2), and the contents of Zn and Ni follow the order of the Residual (F6)>Oxidable (F5)>Reducible (F4)>Water
soluble (F1)>Carbonate (F3)> Exchangeable (F2), and those of Cd follow the order of the Reducible (F4)>Oxidable (F5)>Exchangeable
(F2)>Carbonate (F3)>Residual (F6)>Water soluble (F1). The concentrations of Cu in the different organs of oranges follow the
increasing sequence of pulp>leaf>pericarp, those of Zn and Ni following the increasing sequence of leaf>pulp>pericarp, and
those of Pb and Cd follow the increasing sequence of leaf>pericarp>pulp. Correlation degrees of different forms of same heavy
metals in soils are according to the order of Cu>Zn>Cd>Pb>Ni. Correlation degrees of different heavy metals in same forms
are according to the order that the forms of Reducible (F4), Oxidable (F5) and Residual (F6) are higher than the forms of
Water soluble (F1), Exchangeable (F2) and Carbonate (F3). There are either positive or negative correlations between heavy
metals in leaves and in pulp, while there are all positive correlations between heavy mentals in leaves and in pericarp. There
are significant correlations between the concentrations of some heavy metals in leaves, pericarp or pulp, and those in speciation
fractions in the soils. |
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| Keywords: | heavy metal orange soil |
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