Abstract
Soil air from top soil of a Danish spruce forest was investigatedmonthly from December 1997 to December 1998 for the occurrence ofchloroform, 1,1,1-trichloroethane, tetrachloromethane, trichloroethene and tetrachloroethene. Within the monitoring period, three different patterns of soil air concentrations wereidentified. For chloroform, concentrations peaked in spring and autumn while 1,1,1-trichloroethane and tetrachloromethane peakedduring 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 productionby 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.
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Haselmann, K.F., Laturnus, F. & Grøn, C. Formation of Chloroform in Soil. A Year-round Study at a Danish Spruce Forest Site. Water, Air, & Soil Pollution 139, 35–41 (2002). https://doi.org/10.1023/A:1015896719508
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DOI: https://doi.org/10.1023/A:1015896719508