How good are the predictions of mobility of aged polychlorinated biphenyls (PCBs) in soil? Insights from a soil column experiment

The Science of the Total Environment
Chiara Maria VitaleAntonio Di Guardo

Abstract

A column leaching experiment was performed to evaluate the influence of some relevant environmental factors (soil/water contact time, temperature, saturation) on mobility of aged polychlorinated biphenyls (PCBs) in soil together with transport mediated by dissolved organic carbon (DOC) and mobile organic carbon (OC) coated fine particles/colloids. Consecutive fractions of leachates were collected after a variable pre-equilibration time (2, 5, 7, 48 days), using leaching solutions with different DOC content (tap water vs. Aldrich humic acid), in saturated vs. field capacity conditions and at different temperatures (25 °C vs. 15 °C). The data obtained were compared to the predicted values using a multimedia model (SoilPlusVeg) to evaluate model behaviour. Contact time and temperature determined a relevant effect on DOC and particle/colloid availability, with significant variations in leachate concentrations (up to 1 order of magnitude), typically overlooked by most environmental fate models. Results obtained at different temperatures show a modulation of the DOC/particles production with temperature and therefore the role of temperature changes in the environmental scenarios (e.g. seasonal variations). Transport of PCBs enhanced ...Continue Reading

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Citations

Jan 17, 2019·International Journal of Phytoremediation·Nancy J PinoGustavo A Peñuela
Aug 10, 2019·Journal of Forensic Sciences·Roger W ByardShari L Forbes
Apr 18, 2019·Bulletin of Environmental Contamination and Toxicology·Zijiao YuanChunnian Da
Jan 27, 2019·The Science of the Total Environment·Chiara Maria Vitale, Antonio Di Guardo

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