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.

• Klíčová slova
• Chemical oxidation, Chlorobenzenes, HCH, Hexachlorocyclohexanes, Lindane, Peroxydisulfate, Peroxymonosulfate,
• MeSH
• chlorfenoly chemie   MeSH
• elektrochemie MeSH
• hexachlorcyklohexan chemie   MeSH
• insekticidy chemie   MeSH
• látky znečišťující půdu chemie   MeSH
• oxidancia chemie   MeSH
• peroxidy chemie   MeSH
• podzemní voda MeSH
• regenerace a remediace životního prostředí * MeSH
• sírany chemie   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Česká republika MeSH
• Názvy látek
• 2,4,6-trichlorophenol MeSH Prohlížeč
• chlorfenoly MeSH
• hexachlorcyklohexan MeSH
• insekticidy MeSH
• látky znečišťující půdu MeSH
• oxidancia MeSH
• peroxidy MeSH
• peroxymonosulfate MeSH Prohlížeč
• sírany MeSH