Vertical And Horizontal Variation In Natural
Chloroform In Two Adjacent Soil Profiles In A
Coniferous Forest
Author(s)
C. N. Albers, T. Laier & O. S. Jacobsen
Abstract
Naturally produced chloroform is occasionally detected in soil and groundwater
of non-urban areas in concentrations that can exceed the regulatory levels. In this
study, we present the distribution of naturally produced chloroform in a
temperate coniferous forest from top soil to upper groundwater. Chloroform is
most likely produced by the activity of fungi, and the production varies therefore
with the domains of certain unidentified fungi. We show that the differences in
concentration within 10 metres can approach two orders of magnitude in the top
soil. The difference in chloroform concentrations in upper groundwater within
the same distance is almost one order of magnitude. The concentration of
chloroform in the top soil varies significantly with season, while season affect
deeper levels much less.
Keywords: chloroform, fungi, groundwater, unsaturated zone, natural
organohalogens.
1 Introduction
Halogenated organic compounds in the environment are usually viewed as a
result of human activity. Even though this is often true, more than 3800 naturally
produced halogenated organic compounds have been identified so far [1]. In nonurban
environments, chloroform (CHCl3) is occasionally detected in the
groundwater where no obvious anthropogenic source is present [2]. Furthermore,
global estimations of chloroform production have shown that less than 10% is of
anthropogenic origin whereas marine and terrestrial production must make up
more than 85% [3,4].
Keywords
chloroform, fungi, groundwater, unsaturated zone, naturalorganohalogens.
Related Book
Other papers in this volume
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