TY - JOUR
T1 - Chemical oxidation of hexachlorocyclohexanes (HCHs) in contaminated soils
AU - Usman, M.
AU - Tascone, O.
AU - Faure, P.
AU - Hanna, K.
N1 - Funding Information:
The authors gratefully acknowledge the funding of the French Organization ADEME “Agence de l'Environnement et de la Maîtrise de l'Energie” Convention N° 0972C0016 . We are also thankful to Prof. C. Ruby (UMR7564 LCPME) and C. Lorgeoux (UMR7359 Géoressources) for supporting this work.
PY - 2014/4/1
Y1 - 2014/4/1
N2 - Chemical oxidation of hexachlorocyclohexanes (HCHs) was evaluated in (i) artificially spiked sand with HCH isomers (α, β, γ and δ) and (ii) contaminated soil sampled from a former gravel pit backfilled with wastes of lindane (γ-HCH). Following oxidation treatments were employed: hydrogen peroxide alone (HP), hydrogen peroxide with soluble FeII (Fenton-F), sodium persulfate alone (PS), FeII activated persulfate (AP) and permanganate (PM). GC-MS results revealed a significant degradation of all isomers in spiked soil in the order: F>PS>AP>HP>PM. Soluble FeII enhanced the efficiency of H2O2 but decreased the reactivity of persulfate. Similar trend was observed in contaminated soil, but with less degradation probably caused by scavenging effect of organic matter and soil minerals and/or pollutant unavailability. No significant increase in oxidation efficiency was observed after using availability-enhancement agents in contaminated soil. Other limitation factors (oxidant dose, pH, catalyst type etc.) were also addressed. Among all the isomers tested, β-HCH was the most recalcitrant one which could be explained by higher metabolic and chemical stability. No by-products were observed by GC-MS regardless of the oxidant used. For being the premier study reporting chemical oxidation of HCH isomers in contaminated soils, it will serve as a base for in-situ treatments of sites contaminated by HCH isomers and other persistent organic pollutants.
AB - Chemical oxidation of hexachlorocyclohexanes (HCHs) was evaluated in (i) artificially spiked sand with HCH isomers (α, β, γ and δ) and (ii) contaminated soil sampled from a former gravel pit backfilled with wastes of lindane (γ-HCH). Following oxidation treatments were employed: hydrogen peroxide alone (HP), hydrogen peroxide with soluble FeII (Fenton-F), sodium persulfate alone (PS), FeII activated persulfate (AP) and permanganate (PM). GC-MS results revealed a significant degradation of all isomers in spiked soil in the order: F>PS>AP>HP>PM. Soluble FeII enhanced the efficiency of H2O2 but decreased the reactivity of persulfate. Similar trend was observed in contaminated soil, but with less degradation probably caused by scavenging effect of organic matter and soil minerals and/or pollutant unavailability. No significant increase in oxidation efficiency was observed after using availability-enhancement agents in contaminated soil. Other limitation factors (oxidant dose, pH, catalyst type etc.) were also addressed. Among all the isomers tested, β-HCH was the most recalcitrant one which could be explained by higher metabolic and chemical stability. No by-products were observed by GC-MS regardless of the oxidant used. For being the premier study reporting chemical oxidation of HCH isomers in contaminated soils, it will serve as a base for in-situ treatments of sites contaminated by HCH isomers and other persistent organic pollutants.
KW - Fenton
KW - Hexachlorocyclohexanes
KW - Lindane
KW - Oxidation
KW - Persulfate
KW - Soil
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U2 - 10.1016/j.scitotenv.2014.01.027
DO - 10.1016/j.scitotenv.2014.01.027
M3 - Article
C2 - 24486498
AN - SCOPUS:84893391360
SN - 0048-9697
VL - 476-477
SP - 434
EP - 439
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -