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Dehydrogenase activity of the microbial biomass in soils from a field experiment amended with heavy metal contaminated sewage sludges.

Obbard, J. P. and Sauerbeck, D. and Jones, K. C. (1994) Dehydrogenase activity of the microbial biomass in soils from a field experiment amended with heavy metal contaminated sewage sludges. Science of the Total Environment, 142 (3). pp. 157-162.

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Abstract

Dehydrogenase activity (DHA) of the microbial biomass was measured in sewage sludge amended soil samples collected from the Braunschweig experimental site, Germany. The site had received additions of sludge with or without heavy metals at two application rates (100 m3/ha per year and 300 m3/ha per year) on soils of ‘low’ (4.8–5.8) and ‘high’ (5.4–7.0) pH since 1980. DHA was found to be a sensitive and precise assay for determining the effect of heavy metals on substrate-induced (glucose) microbial biomass in sewage sludge amended soils. Effects on DHA were determined in relation to heavy metal concentrations and other soil factors. Addition of relatively uncontaminated sludge enhanced DHA, but this was dependent on the level and type of sludge addition. Adverse metal effects were only significant in the most contaminated soils where sludge had been added to the ‘high’ andd ‘low’ pH treatments at Braunschweig. However, these effects were small compared to the effects of high rates of sludge addition alone, despite exceeding statutory limits for Zn and Cu, where concentrations reached 341 and 99 μg/g, respectively.

Item Type: Article
Journal or Publication Title: Science of the Total Environment
Uncontrolled Keywords: Dehydrogenase ; Soil ; Sludge ; Microbiol biomass
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22498
Deposited By: ep_ss_importer
Deposited On: 28 Jan 2009 15:11
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22498

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