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Polycyclic aromatic hydrocarbons in ash: Determination of total and leachable concentrations
Umeå University, Faculty of Science and Technology, Chemistry.
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2008 (English)In: Environmental Pollution, Vol. 152, no 2, 285-92 p.Article in journal (Refereed) Published
Abstract [en]

Before wood ash can be used as a soil fertilizer, concentrations of environmentally hazardous compounds must be investigated. In this study, total and leachable concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) were determined in four ash samples and one green liquor sludge. The ash sample with the highest carbon content also contained high levels of PAHs; three of the ash samples had total concentrations exceeding the limit permitted by the Swedish Forest Agency for recycling to forest soils. The leachable concentrations were higher for the non-stabilized samples; this was probably due to colloid-facilitated transport of the contaminants in these samples. However, the leachable concentrations were overall relatively low in all the samples studied. The amounts of PAHs introduced to forest soils by additions of stabilized, recyclable ash products will be determined primarily by the rate of weathering of the ash particles and the total concentration of contaminants.

Total PAH content and the particle weathering rate are more important influences on the rate of migration of PAHs from recycled wood ash into forest soils than leaching.

Place, publisher, year, edition, pages
2008. Vol. 152, no 2, 285-92 p.
Keyword [en]
Column leaching, Municipal solid waste ash, Polycyclic aromatic hydrocarbons, Transport, Wood ash
Identifiers
URN: urn:nbn:se:umu:diva-16234DOI: doi:10.1016/j.envpol.2007.06.055OAI: oai:DiVA.org:umu-16234DiVA: diva2:155907
Available from: 2008-03-04 Created: 2008-03-04 Last updated: 2011-01-10Bibliographically approved

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Lundin, Lisa

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