Ultrasound and environment: sonochemical destruction of chloroaromatic derivatives
Article Abstract:
Two sites where sonochemical reactions can occur were identified through a comparative study of 4-chlorophenol (4-ClPh) and chlorobenzene (ClBz) as models for hydrophilic and hydrophobic substrates respectively. It was found via experiments at 20 kHz and 500 kHz, that dechloronization yields were higher with the 500kHz ultrasonic source than with the common 20-kHz probe used. Also, the reaction proceeds quickly with the ClBz and chloride is quantitavely recovered while the 4-ClPh degradation occurs at a lower rate. The consequences of the existence of the differing pathways are significant for the treatment of a wastewater containing the two types of pollutants.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Volatile loss of PCB aroclors from subaqueous sand
Article Abstract:
A study aimed at determining the rate of volatile loss of polychlorinated biphenyls (PCBs) from subaqueous quartz sand laced with aroclors is presented. The five experiments were performed using subaqueous quartz sand laced with aroclors 1242, 1248, 1254, and 1260. The results showed varying degrees of PCB loss, suggesting that the amount and rate of volatile loss of PCBs and other hydrophobic compounds from wet soils and sediments are governed by certain conditions.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Determination of dicyclopentadiene and its derivatives as compounds causing odors in groundwater supplies
Article Abstract:
Industrial organochlorinated solvents, particularly di- to hexachlorinated saturated and unsaturated hydrocarbons-dicyclopentadiene (DCPD), with a mean concentration of <1 microng/L is the compound that cause odor in the groundwater from the Lower Llobregat aquifer system in Barcelona, Spain. The compound, which has an established threshold odor of 10 to 25 ng/L, and other pollutants could have come from an illegal landfill that was closed in the 1970s.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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