Formation of chloroform in soil. A year-round study at a Danish spruce forest site

K.F. Haselmann, F. Laturnus, C. Grøn

    Research output: Contribution to journalJournal articleResearchpeer-review


    Soil air from top soil of a Danish spruce forest was investigated monthly from December 1997 to December 1998 for the occurrence of chloroform, 1,1,1-trichloroethane, tetrachloromethane, trichloroethene and tetrachloroethene. Within the monitoring period, three different patterns of soil air concentrations were identified. For chloroform, concentrations peaked in spring and autumn while 1,1,1-trichloroethane and tetrachloromethane peaked during mid winter. Trichloroethene and tetrachloroethene, concentrations remained constant throughout the year. The relative ratios of soil air concentrations to ambient air concentrations indicated a natural production of chloroform, while the other chlorinated compounds investigated probably originated from non-point source pollution. The seasonal variation of the chloroform concentration suggested a production by microorganisms, as high chloroform concentrations were found in the soil in warm and humid periods of the year (spring and autumn) with high microbial activity.
    Original languageEnglish
    JournalWater, Air and Soil Pollution
    Issue number1-4
    Pages (from-to)35-41
    Publication statusPublished - 2002


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