Original scientific paper
https://doi.org/10.2478/10004-1254-64-2013-2326
Copper and Zinc Fractionation in Apple Orchard Soil in the Village of Bukevje (Croatia) Using the Revised Four-Step BCR Extraction Procedure
Gordana Medunić
; Division of Mineralogy and Petrology, Zagreb, Croatia
Iva Juranović Cindrić
; Laboratory of Analytical Chemistry, Zagreb, Croatia
Ivanka Lovrenčić Mikelić
; Faculty of Science, University of Zagreb, Laboratory for Radioecology, Institute Ruđer Bošković, Zagreb, Croatia
Nenad Tomašić
; Advanced Energy Ltd4., Zagreb, Croatia
Dražen Balen
; Division of Mineralogy and Petrology, Zagreb, Croatia
Višnja Oreščanin
; Advanced Energy Ltd4., Zagreb, Croatia
Štefica Kampić
; Division of Mineralogy and Petrology, Zagreb, Croatia
Ivana Ivković
; Division of Mineralogy and Petrology, Zagreb, Croatia
Abstract
The aim of this study was to establish the fractionation of copper and zinc in a small apple orchard using the revised (four-step) Bureau Communautaire de Référence (BCR) sequential extraction procedure and assess their potential mobility in soil. Soil samples were collected at the depth of 10 cm to 25 cm, sixteen from the orchard and five control samples from a meadow located some 200 m away from the orchard. As the distribution of trace-element concentrations in the control samples was normal, they were used for comparison as background levels. We also determined soil mineralogical composition, carbonate content, soil pH, cation exchange capacity, and soil organic matter. The extraction yields of Cu and Zn from the control soil were lower than from the orchard soil (25 % vs. 34 % and 47 % vs. 52 %, respectively), which pointed to natural processes behind metal bonding in the control soil and greater influence of man-made activities in the orchard soil. Compared to control, the orchard soil had significantly higher concentrations of total Cu (P=0.0009), possibly due to the application of Cu-based fungicides. This assumption was further supported by greater speciation variability of Cu than of zinc, which points to different origins of the two, Cu from pesticides and Zn from the parent bedrock. Copper levels significantly better (P=0.01) correlated with the oxidisable fraction of the orchard soil than of control soil. Residual and organically bound copper and zinc constituted the most important fractions in the studied soils. However, the use of Cu-based fungicides in the apple orchard did not impose environmental and health risk from Cu exposure.
Keywords
BCR extraction; bedrock lithology; floodplain; fungicides; Sava River; trace elements
Hrčak ID:
111767
URI
Publication date:
6.12.2013.
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