Soil contamination by the use of fence posts treated with chromated copper arsenate
DOI:
https://doi.org/10.5902/1980509886024Keywords:
Wood preservation, Wood treatment, Chemical leaching, CCA-CAbstract
The chemical components used to treat fence posts with chromated copper arsenate (CCA) leach from the wood and have the potential to contaminate soil, surface water and groundwater, be absorbed by plants and, consequently, pose risks to animals and human health, which makes its use questionable. The present work aimed to evaluate soil contamination through the use of fence posts chemically treated with chromated copper arsenate type C. To this end, five fence posts of Eucalyptus spp., previously treated industrially with chromated copper arsenate, were planted in the field. To evaluate soil contamination, a cross section was removed from each fence post and the soil was collected, before the experiment was set up and after the end of the field evaluations. Throughout the experiment, six soil collection evaluations were carried out (1, 94, 226, 318, 460 and 880 days) at two depths (0 to 20 cm and 20 to 40 cm). The wood preservative chemical constituents leached from the fence posts into the soil. The arsenic concentration of the fence posts showed a reduction of 55.0%. The concentration of arsenic in the soil increased by 129.2%, being 32.3% higher than the maximum value for investigation in the agricultural sector, according to CONAMA resolution 420/2009, demonstrating potential risks of contamination, direct or indirect, to human health.
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