Ecotoxicological assessment of heavy metals in sewage sludge amended soils

Key microbial parameters impacted by heavy metals in sewage sludges applied as soil amendments were studied to highlight the importance of such parameters in addition to soil geochemical parameters. Dehydrogenase enzyme activity was measured in field experiments, as was the presence and number of ef...

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Published in:Applied geochemistry 2001-08, Vol.16 (11-12), p.1405-1411
Main Author: OBBARD, J. P
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Pollution, environment geology
Rhizobium
Rhizobium leguminosarum
Soils
Surficial geology
Trifolium repens
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description Key microbial parameters impacted by heavy metals in sewage sludges applied as soil amendments were studied to highlight the importance of such parameters in addition to soil geochemical parameters. Dehydrogenase enzyme activity was measured in field experiments, as was the presence and number of effective nitrogen fixing cells of Rhizobium leguminosarum biovar trifolii capable of nodulating the host plant, white clover. Findings were assessed with respect to maximum permissible concentrations of heavy metals in sludge amended soils, as found in UK limit values and EEC directives. In some cases, particularly for measurements of symbiotic dinitrogen fixation, effects were evident at metal concentrations below statutory limits for toxic elements.
doi_str_mv 10.1016/S0883-2927(01)00042-7
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subjects Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Pollution, environment geology
Rhizobium
Rhizobium leguminosarum
Soils
Surficial geology
Trifolium repens
title Ecotoxicological assessment of heavy metals in sewage sludge amended soils
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