Fate and Origin of 1,2-Dichloropropane in an Unconfined Shallow Aquifer

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• 作者：Anthony J. Tesoriero ; Frank E. Lö ; ffler ; and Hugh Liebscher
• 刊名：Environmental Science & Technology
• 出版年：2001
• 出版时间：February 1, 2001
• 年：2001
• 卷：35
• 期：3
• 页码：455 - 461
• 全文大小：168K
• 年卷期：v.35,no.3(February 1, 2001)
• ISSN：1520-5851

文摘

A shallow aquifer with different redox zones overlain byintensive agricultural activity was monitored for theoccurrence of 1,2-dichloropropane (DCP) to assess thefate and origin of this pollutant. DCP was detected morefrequently in groundwater samples collected in aerobic andnitrate-reducing zones than those collected from iron-reducing zones. Simulated DCP concentrations forgroundwater entering an iron-reducing zone were calculatedfrom a fate and transport model that included dispersion,sorption, and hydrolysis but not degradation. Simulatedconcentrations were well in excess of measured values,suggesting that microbial degradation occurred in the iron-reducing zone. Microcosm experiments were conductedusing aquifer samples collected from iron-reducingand aerobic zones to evaluate the potential for microbialdegradation of DCP and to explain field observations.Hydrogenolysis of DCP and production of monochlorinatedpropanes in microcosm experiments occurred only withaquifer materials collected from the iron-reducing zone, andno dechlorination was observed in microcosms establishedwith aquifer materials collected from the aerobic zones.Careful analyses of the DCP/1,2,2-trichloropropane ratios ingroundwater indicated that older fumigant formulationswere responsible for the high levels of DCP present in thisaquifer.