The spatial distribution of organochlorine pesticides (OCs) in soils and their potential for soil–air exchange was examined. The most prominent OCs were the DDTs (Geometric Mean, GM = 1.6 ng g−1), endosulfans (0.16 ng g−1), and toxaphenes (0.64 ng g−1). DDTs in soils of southern Mexico showed fresher signatures with higher FDDTe = p,p′-DDT/(p,p′-DDT + p,p′-DDE) and more racemic o,p′-DDT, while the signatures in the central and northern part of Mexico were more indicative of aged residues. Soil–air fugacity fractions showed that some soils are net recipients of DDTs from the atmosphere, while other soils are net sources. Toxaphene profiles in soils and air showed depletion of Parlar 39 and 42 which suggests that soil is the source to the atmosphere. Endosulfan was undergoing net deposition at most sites as it is a currently used pesticide. Other OCs showed wide variability in fugacity, suggesting a mix of net deposition and volatilization.
Article
Organochlorine pesticides in soils of Mexico and the potential for soil-air exchange.
USF St. Petersburg campus Faculty Publications
Document Type
Article
Publication Date
2010
Disciplines
Abstract
Publisher
Pergamon Press
Creative Commons License
Creative Commons Attribution-Noncommercial-No Derivative Works 4.0
Citation Information
Wong, F., Alegria, H.A., & Bidleman, T.F. (2010). Organochlorine pesticides in soils of Mexico and the potential for soil-air exchange. Environmental Pollution, 158(3), 749-755. doi: 10.1016/j.envpol.2009.10.013.
Abstract only. Full-text article is available through licensed access provided by the publisher. Published in Environmental Pollution, 158(3), 749-755. doi: 10.1016/j.envpol.2009.10.013. Members of the USF System may access the full-text of the article through the authenticated link provided.