18th International Conference on Heavy Metals in the Environment-Abstract Book
International Conference on Heavy Metals in the Environment edition:18 location:Ghent date:12-15 September 2016
Despite the fact that Ba is the 14th most abundant element on Earth, and concentrations in soil are often elevated, relatively few studies deal with the occurrence of Ba in soil. Information on how changing environmental conditions, assessed by laboratory or field investigations, can potentially affect Ba mobility is only scarcely available. Nevertheless, the increased use of barite, for example as a weighting agent for drilling mud in the oil and gas sector, attracted the attention to this element in recent years. Other applications of Ba are its use in superconductors and contrasting agents. In British Columbia, matrix numerical soil standards for Ba were supplemented with an extraction method for the determination of soluble barium (Alberta Environment, 2009). Leaching tests and extractions that have been developed to evaluate heavy metal mobility in soils, ask for a careful interpretation when Ba is considered, and are probably not always suited for Ba because of unintended side effects such as precipitation reactions. In the present study, the release of Ba from soil samples characterized by a varying clay and organic matter content and a wide range of total Ba concentrations, was investigated using commonly applied single and sequential extractions, pHstat leaching tests and column tests. Additionally, certified reference materials were analyzed, in order to provide data for Ba, which are not yet available at the moment.