Initiation of [36Cl]hexachlorobenzene dechlorination in three different soils under artificially induced anaerobic conditions |
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Authors: | P Rosenbrock R Martens F Buscot J C Munch |
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Institution: | Federal Agricultural Research Centre, Institute of Soil Biology, Bundesallee 50, D-38116 Braunschweig, Germany Tel.:+49 (0) 531 596 342 Fax:+49 (0) 531 595 375 e-mail: rosenbrock@kepler.dv.fal.de, DE GSF-National Research Centre for Environment and Health, Institute for Soil Ecology, Ingolst?dter Landstra?e 1, D-85764 Neuherberg near Munich, Germany, DE
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Abstract: | The potential for reductive dechlorination of hexachlorobenzene was investigated in samples of three different, naturally
oxic soils held under conditions of high oxygen deficiency. The soils were water-saturated and the influence on dechlorination
of adding different electron donors, a surfactant and an anaerobic microbial consortium was tested. The influence of supplied
electron donors seems to depend on the organic matter content of the soils. Dechlorination in the organic-matter-rich soil
from Maulach was not affected by amendment with organic electron donors. A release of about 40% chloride within 140 days was
observed for this soil in all biotic-treated assays. By contrast, the organic-matter-poor soil of Eppingen showed no dechlorination
in unamended assays. However, when it was supplemented with organic electron donors dechlorination of 2%–37% occurred within
140 days, depending on the type of electron donor. Complex substrate (wheat strawdust), from which carbon is slowly liberated,
gave the best results. These two soils had an indigenous dechlorinating anaerobic microflora, whereas the third soil (Rastatt)
required inoculation with an anaerobic consortium for dechlorination. The addition of electron donors alone did not cause
dechlorination in this sandy soil. The addition of a surfactant (Tween 80) to increase the bioavailability of hexachlorobenzene
did not enhance dechlorination. This process was not inhibited by inherent alternative electron acceptors in soil (NO3−, SO4
2−, Fe3+). The dechlorination did not require methanogenic conditions.
Received: 12 December 1996 / Received revision: 14 March 1997 / Accepted: 15 March 1997 |
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