Assessment of environmentally persistent free radicals in soils and sediments from three Superfund sites
- 7 November 2013
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Environmental Science: Processes & Impacts
- Vol. 16 (1), 44-52
- https://doi.org/10.1039/c3em00428g
Abstract
We previously reported the presence of environmentally persistent free radicals (EPFRs) in pentachlorophenol (PCP) contaminated soils at a closed wood treatment facility site in Georgia. The reported EPFRs were pentachlorophenoxyl radicals formed on soils under ambient conditions via electron transfer from PCP to electron acceptors in the soil. In this study, we present results for soil and sediment samples from additional Superfund sites in Montana and Washington. Paramagnetic centers associated with different chemical environments were characterized by distinct g-factors and line widths (ΔHp-p). EPFR concentrations in contaminated samples were ∼30×, ∼12×, and ∼2× higher than background samples at the Georgia, Montana, and Washington sites, respectively. EPR signals in the Montana contaminated soils were very similar to those previously observed for pentachlorophenol contaminated soils at the Georgia site, i.e., g = 2.00300 and ΔHp-p = 6.0 G, whereas signals in the Washington sediment samples were similar to those previously observed for other PAH contaminated soils, i.e., g = 2.00270 and ΔHp-p = 9.0 G. Total carbon content measurements exhibited direct correlation with EPFR concentration. The presence of radicals in sites contaminated a decade to a century ago suggests continuous formation of EPFRs from molecular contaminants in the soil and sediment.Keywords
This publication has 52 references indexed in Scilit:
- Effect of Low Temperature Thermal Treatment on Soils Contaminated with Pentachlorophenol and Environmentally Persistent Free RadicalsEnvironmental Science & Technology, 2012
- Environmentally Persistent Free Radicals (EPFRs). 1. Generation of Reactive Oxygen Species in Aqueous SolutionsEnvironmental Science & Technology, 2011
- Detection of Environmentally Persistent Free Radicals at a Superfund Wood Treating SiteEnvironmental Science & Technology, 2011
- Pneumoconiosis from Agricultural Dust Exposure among Young California FarmworkersEnvironmental Health Perspectives, 2009
- Environmentally persistent free radicals amplify ultrafine particle mediated cellular oxidative stress and cytotoxicityParticle and Fibre Toxicology, 2009
- Formation and stabilization of persistent free radicalsProceedings of the Combustion Institute, 2007
- The effect of UV and visible light radiation on natural humic acid: EPR spectral and kinetic studiesGeoderma, 2005
- Modelling the dynamics of pentachlorophenol bioavailability in column experimentsWater Research, 2004
- Single electron transfer mechanism of oxidative dechlorination of 4-chloroanisole on copper(II)-smectiteEnvironmental Science & Technology, 1987
- Radical formation and polymerization of chlorophenols and chloroanisole on copper(II)-smectiteEnvironmental Science & Technology, 1986