Predicting molybdenum toxicity to higher plants: influence of soil properties

Environmental Pollution
Steve P McGrathF J Zhao

Abstract

The effect of soil properties on the toxicity of molybdenum (Mo) to four plant species was investigated. Soil organic carbon or ammonium-oxalate extractable Fe oxides were found to be the best predictors of the 50% effective dose (ED50) of Mo in different soils, explaining>65% of the variance in ED50 for four species except for ryegrass (26-38%). Molybdenum concentrations in soil solution and consequently plant uptake were increased when soil pH was artificially raised because sorption of Mo to amorphous oxides is greatly reduced at high pH. The addition of sulphate significantly decreased Mo uptake by oilseed rape. For risk assessment, we suggest that Mo toxicity values for plants should be normalised using soil amorphous iron oxide concentrations.

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Citations

Jun 19, 2012·Chemosphere·Jason K KirbyBabasola Ajiboye
Oct 19, 2010·Ecotoxicology and Environmental Safety·Cornelis A M van GestelMaria Diez Ortiz
Jul 9, 2013·Environmental Toxicology and Chemistry·Maja A LarssonErik Smolders
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Jun 18, 2021·Integrated Environmental Assessment and Management·Maxime LouzonAnnette de Vaufleury
Nov 15, 2013·The Journal of Physical Chemistry. a·A Davantès, G Lefèvre

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