Title: Chlorinated organic pollutants in soil and groundwater at chlorophenol-contaminated sawmill sites 
Resource Type: document --> technical publication --> Phd thesis 
Country: Sweden 
Year: 2007 
Availability: Publisher: Umeå: Umeå University, Faculty of Science and Technology, Chemistry Distributor: Year: 2007 Available: 2007-02-01 Pages: 50 ISBN: 978-91-7264-251-5 
Author 1/Producer: Ylva Persson 
Author / Producer Type: University research group / research institute 
Publisher: Umeå University, Faculty of Science and Technology, Chemistry 
Publisher City: Umeå University, Faculty of Science and Technology, Chemistry, 90187 Umeå 
ISBN: 978-91-7264-251-5 
Report / download web link (=direct link): http://www.diva-portal.org/umu/theses/abstract.xsql?dbid=989  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 663 
EUGRIS Keyword(s): Contaminated land-->Risk assessment-->Exposure pathways
Contaminated land-->Risk management-->Monitoring and aftercare
Contaminated land-->Risk management-->Selection of remediation options
Contaminated land-->Site investigation-->Methods
Contaminated land-->Site investigation-->Sampling and analysis
Contaminated land-->Site investigation-->Sampling strategy
Contaminated land-->Site investigation-->Site description
Contaminated land-->Soil and groundwater processes-->Contaminant hydrology
Contaminated land-->Soil and groundwater processes-->Geochemistry
 
Short description: Soils contaminated with chlorophenol preservatives have been shown to also contain dioxin and dioxinlike pollution. The question on the process of tranformations, and mobility of these hydrophobic componds have been assessed in this thesis. 
Long description: Mixtures of chlorinated organic pollutants can be found in the soils at chlorophenol-contaminated sawmill, including (inter alia) polychlorinated phenols (CPs), phenoxyphenols (PCPPs), diphenyl ethers (PCDEs), dibenzofurans (PCDFs) and dioxins (PCDDs). These hydrophobic compounds have low water solubility and hence low mobility as truly dissolved compounds. However, they may migrate through the soil at significant rates via co-transport with dissolved organic matter (DOM) and colloids of fine, waterborne particulate matter. In the work underlying this thesis the distribution of chlorinated hydrophobic pollutants between these two mobile fractions in soil samples from five sawmill sites was studied Soils at five sites at which CPs were formerly used were characterized, and found to have complex profiles of chlorinated hydrophobic pollutants. CPs, PCPPs, PCDEs and PCDD/Fs were present at up to ppm-levels. Furthermore, the relative proportions of the pollutants differed from their relative proportions in the preservatives used at the sites, indicating that they have been transported from, and/or degraded in, the soil at different rates. These organic pollutants have low water solubility and strong affinity for soil organic matter (SOM). The importance of SOM for the fate of CPs, PCPPs, PCDEs, PCDFs and PCDDs in soil was investigated by examining the distribution of compounds between the mobile DOM and the immobile particulate organic matter (POM). The partitioning of CPs between DOM and POM was found to be approximately equal. However, the relative strength of association with POM of groups of chlorinated organic pollutants was positively correlated with their hydrophobicity, and thus increased in the order CP < PCPP < PCDE < PCDF < PCDD. Despite the weak association of PCDD/Fs with DOM our investigations found that considerable concentrations of these pollutants were bound to mobile fractions (DOM and colloids, >0.2 µm) in both a groundwater analysis and a leaching test. CPs and PCPP were present at up to ppm- and ppb-levels, respectively, and PCDEs and PCDD/Fs at up to ppt-levels. The importance of transport in association with the mobile fraction (DOM and colloids) increased with increasing hydrophobicity e.g. PCDDs were almost entirely associated with fine particulate matter, while CPs were largely found in the water phase and only minor proportions were associated with colloids. 
Link to Project(s): MCN Northern Sweden Soil Remediation Center
 
Link to Organisation(s): Umeå University
 
Submitted By: Mr Thomas Liljedahl WhoDoesWhat?      Last update: 07/02/2007