Please use this identifier to cite or link to this item: https://doi.org/10.1016/S0883-2927(01)00042-7
Title: Ecotoxicological assessment of heavy metals in sewage sludge amended soils
Authors: Obbard, J.P. 
Issue Date: 2001
Citation: Obbard, J.P. (2001). Ecotoxicological assessment of heavy metals in sewage sludge amended soils. Applied Geochemistry 16 (11-12) : 1405-1411. ScholarBank@NUS Repository. https://doi.org/10.1016/S0883-2927(01)00042-7
Abstract: Contamination of soils by potentially toxic elements (PTEs) (e.g. Zn, Cu, Ni, Cr, Pb, Cd) from amendments of sewage sludge is subject to strict controls within the European Community in relation to total permissible metal concentrations, soil properties and intended use. This paper highlights the need for ecotoxicological data for the assessment of PTE impacts in addition to geochemical data alone. The soil microflora plays an essential role in determining levels of soil fertility, being intimately associated with the biogeochemical cycling of essential plant nutrients and the turnover of organic carbon. The measurement of soil microbiological parameters can provide insight into the impact of PTEs upon soil fertility, where geochemical analysis alone can often be inadequate to assess contaminant effects on essential components of the soil ecosystem. Microbial investigations were conducted on soils sampled from a well-controlled field experiment previously amended with specific types and rates of sewage sludge. Key microbiological parameters measured included the activity of the dehydrogenase enzyme and the presence and number of effective nitrogen fixing cells of Rhizobium leguminosarum biovar trifolii capable of nodulating the host plant, white clover (Trifolium repens). Results were evaluated with respect to maximum permissible concentrations of PTEs in sludge amended soils, as stipulated under UK limit values and the European Directive 86/278/EEC. Important effects on the size of the Rhizobium population and dehydrogenase activity were apparent in soils samples in relation to the soil pH, sludge type, addition rates and the concentrations of PTE present. © 2001 Elsevier Science Ltd.
Source Title: Applied Geochemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/75194
ISSN: 08832927
DOI: 10.1016/S0883-2927(01)00042-7
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

63
checked on Dec 6, 2018

WEB OF SCIENCETM
Citations

53
checked on Nov 21, 2018

Page view(s)

55
checked on Nov 9, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.