Long term changes in polychlorodibenzo-p-dioxin concentrations in wood treated with technical pentachlorophenol |
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Authors: | MR Cull AJ Dobbs |
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Institution: | Building Research Establishment Princes Risborough Laboratory Princes Risborough, Aylesbury Buckinghamshire, United Kingdom |
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Abstract: | Wood samples treated with technical pentachlorophenol (PCP), technical sodium pentachlorophenoxide (NaPCP) and octachlorodibenzo-p-dioxin have been exposed outdoors for periods up to years. Analysis of extracts from the samples show that photolytic reductive dechlorination of highly chlorinated dibenzo-p-dioxins to less chlorinated isomers occurs. However there is no discernible increase in polychlorodibenzo-p-dioxin concentrations in the technical PCP treated wood presumably because further photolytic reactions and volatilisation compete effectively with the photolytic formation. There is no evidence for formation of octachlorodibenzo-p-dioxin (OCDD) in technical PCP treated wood in this study, probably because photolytic destruction and volatilisation compete effectively with formation reactions when the initial OCDD concentration is relatively high. |
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