Substantial migration of dioxins in agrochemical formulations

Grant, Sharon, Mortimer, Munro, Stevenson, Gavin and Gaus, Caroline (2009). Substantial migration of dioxins in agrochemical formulations. In: Organohalogen Compounds. 29th International Symposium on Halogenated Persistent Organic Pollutants, Beijing China, (002765-002769). 23-28 August 2009.

Author Grant, Sharon
Mortimer, Munro
Stevenson, Gavin
Gaus, Caroline
Title of paper Substantial migration of dioxins in agrochemical formulations
Conference name 29th International Symposium on Halogenated Persistent Organic Pollutants
Conference location Beijing China
Conference dates 23-28 August 2009
Convener Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences
Proceedings title Organohalogen Compounds   Check publisher's open access policy
Place of Publication Germany
Publisher Eco-Informa Press
Publication Year 2009
Sub-type Fully published paper
ISSN 1026-4892
Volume 71
Start page 002765
End page 002769
Total pages 5
Collection year 2010
Language eng
Abstract/Summary Contaminants with low water solubility and high carbon-water partitioning are generally considered to have low mobility in soils. However, the presence of co-contaminants can act as transport facilitators for otherwise low mobility organic compounds (LMOCs). Little is known about facilitated contaminant migration and this process is rarely considered in evaluations of off-site transport and groundwater contamination potential for LMOCs. This study investigated the vertical migration of dioxins in soil, released together with high volumes of pesticides and adjuvants following an accidental fire at a pesticide production facility. Two intact cores (to 6.7 m) were obtained below clay-lined ponds where contaminated run-off water was contained. PCDD/Fs were found throughout both cores, with maximum concentrations (130 and 94 ng/g) at 2-2.5 meters. A reversed mobility was observed throughout the core depths with the least mobile congener OCDD transported further than the relatively more mobile TCDD. Such a reversal is consistent with surfactant facilitated transport, which is suggested to be the primary pathway for the observed migration. These results highlight that the paradigm of LMOCs being non-mobile in soils should be considered carefully together with application-specific and environmental factors which may have the ability to considerably change the predicted environmental fate of these chemicals.
Subjects 030603 Colloid and Surface Chemistry
920405 Environmental Health
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Proof that Organohalogen Compounds Papers are an E1. The papers presented in the technical and analytical sessions at the annual Dioxin Symposia and published in Organohalogen Compounds are peer reviewed. Publications available on CD of conference only at this stage.

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Created: Wed, 24 Mar 2010, 16:04:47 EST by Manjit Sanghera on behalf of National Res Centre For Environmental Toxicology