Spatial variability of arsenic and chromium in the soil water at a former wood preserving site

Journal of Contaminant Hydrology
Luisa HoppWolfgang Durner

Abstract

Contamination of industrial sites by wood preservatives such as chromated copper arsenate (CCA) may pose a serious threat to groundwater quality. The objective of this study was to characterise the spatial variability of As and Cr concentrations in the solid phase and in the soil water at a former wood impregnation plant and to reveal the fundamental transport processes. The soil was sampled down to a depth of 2m. The soil water was extracted in situ from the vadose zone over a period of 10 months at depths of 1 and 1.5m, using large horizontally installed suction tubes. Groundwater was sampled from a depth of 4.5m. Results showed that arsenic and chromium had accumulated in the upper region of the profile and exhibited a high spatial variability (As: 21-621 mg kg(-1); Cr: 74-2872 mg kg(-1)). Concentrations in the soil water were high (mean As 167 microg L(-1); Cr: 62 microg L(-1)) and also showed a distinct spatial variability, covering concentration ranges up to three orders of magnitude. The variability was caused by the severe water-repellency of the surface soil, induced by the concurrent application of creosote wood preservatives, which leads to strong preferential flow as evident from a dye experiment. In contrast to soi...Continue Reading

References

Jul 3, 2002·Klinische Monatsblätter für Augenheilkunde·Martin Grüterich, Scheffer C G Tseng
Apr 24, 2003·Journal of Environmental Quality·J L RoyR L Johnson
Mar 1, 1996·Analytical and Bioanalytical Chemistry·S AndersenT Westby
Jul 16, 2004·Journal of Environmental Quality·Rômulo Penna Scorza JúniorSjoerd E A T M van der Zee

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