Effect of long-term equilibration on the toxicity of molybdenum to soil organisms

A - Papers appearing in refereed journals

Van Gestel, C. A. M., McGrath, S. P., Smolders, E., Diez Ortiz, M., Borgman, E., Verweij, R. A., Buekers, J. and Oorts, K. 2012. Effect of long-term equilibration on the toxicity of molybdenum to soil organisms. Environmental Pollution. 162, pp. 1-7.

AuthorsVan Gestel, C. A. M., McGrath, S. P., Smolders, E., Diez Ortiz, M., Borgman, E., Verweij, R. A., Buekers, J. and Oorts, K.
Abstract

To determine if long-term equilibration may alleviate molybdenum toxicity, earthworms, enchytraeids, collembolans and four plant species were exposed to three soils freshly spiked with Na2MoO4.2H2O and equilibrated for 6 or 11 months in the field with free drainage. Total Mo concentrations in soil decreased by leaching, most (up to 98%) in sandy soil and less (54–62%) in silty and clayey soils. Changes in residual Mo toxicity with time were inconclusive in sandy soil. In the other two soils, toxicity of residual total Mo was significantly reduced after 11 months equilibration with a median 5.5-fold increase in ED50s. Mo fixation in soil, i.e. the decrease of soil solution Mo concentrations at equivalent residual total soil Mo, was maximally a factor of 2.1 only. This experiment shows natural attenuation of molybdate ecotoxicity under field conditions is related to leaching of excess Mo and other ions as well as to slow ageing reactions. 

Year of Publication2012
JournalEnvironmental Pollution
Journal citation162, pp. 1-7
Digital Object Identifier (DOI)doi:10.1016/j.envpol.2011.10.013
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeSEF
Trace element dynamics in soils and plant uptake
Toxicity and bioavailability of molybdenum in terrestrial environments
Output statusPublished
Publication dates
Online05 Nov 2011
Publication process dates
Accepted09 Nov 2010
Copyright licensePublisher copyright
ISSN0269-7491
PublisherElsevier Sci Ltd

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