Hexachlorocyclohexane (HCH) isomers represent a family of formerly widely utilized pesticides that are persistent, capable of undergoing long-range transport and tend to bioaccumulate in human and animal tissue. Their widespread global utilization coupled with a propensity to adversely impact human health and the environment translates into an urgent need to develop feasible methodologies by which to treat HCH-impacted groundwater and soil. The present study was conducted to evaluate the efficacy of two persulfate-based oxidants: peroxydisulfate (S2O8 (2-), PDS) and peroxymonosulfate (HSO5 (-), PMS) activated by electrochemical processes (EC) to treat HCH-impacted environmental media. This research demonstrated that the optimal experimental conditions (oxidant dose and electrical current) were 2 mM PDS and 20 mA for an aqueous solution of 4 μM of summed HCHs (ΣHCH). GC/MS full scan analysis revealed the presence of 2,4,6-trichlorophenol as the only detectable intermediate formed during electro-activated PDS treatment of ΣHCH. The investigated method was tested on leachate from a known HCHs-impacted site in Hajek, Czech Republic which contained 106 μg/l of ΣHCH and 129 μg/l of chlorobenzenes. Results from batch treatment showed positive results for electro-activated PDS but only negligible effectiveness for electro-activated PMS. In addition to explaining the efficacy of the electro-activated PDS, this research also explored the basis for the differing reactivities of these two persulfates.

• Keywords
• Chemical oxidation, Chlorobenzenes, HCH, Hexachlorocyclohexanes, Lindane, Peroxydisulfate, Peroxymonosulfate,
• MeSH
• Chlorophenols chemistry   MeSH
• Electrochemistry MeSH
• Hexachlorocyclohexane chemistry   MeSH
• Insecticides chemistry   MeSH
• Soil Pollutants chemistry   MeSH
• Oxidants chemistry   MeSH
• Peroxides chemistry   MeSH
• Groundwater MeSH
• Environmental Restoration and Remediation * MeSH
• Sulfates chemistry   MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Geographicals
• Czech Republic MeSH
• Names of Substances
• 2,4,6-trichlorophenol MeSH Browser
• Chlorophenols MeSH
• Hexachlorocyclohexane MeSH
• Insecticides MeSH
• Soil Pollutants MeSH
• Oxidants MeSH
• Peroxides MeSH
• peroxymonosulfate MeSH Browser
• Sulfates MeSH