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Type: Journal article
Title: Aging effects on molybdate lability in soils
Author: Kirby, J.
McLaughlin, M.
Ma, Y.
Ajiboye, A.
Citation: Chemosphere, 2012; 89(7):876-883
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2012
ISSN: 0045-6535
Statement of
Jason K. Kirby, Michael J. McLaughlin, Yibing Ma, Babasola Ajiboye
Abstract: Aging reactions in soils can influence the lability and hence bioavailability of added metals in soils through their removal from labile pools into pools from which desorption is slow (non-labile pools). The aims of this study were to examine the effect of aging reactions on the lability of soluble molybdate (MoO(4)(2-)) added into soils with varying physical and chemical properties and develop models to predict changes in the labile pool of MoO(4)(2-) in soils with incubation time. Soils were spiked with soluble MoO(4)(2-) at quantities sufficient to inhibit barley root growth by 10% (EC(10)) or 90% (EC(90)) and incubated for up to 18 months. The labile pool of MoO(4)(2-) (E value) was observed to decrease in soils with incubation time, particularly in soils with high clay content. A strong relationship was observed between measures of MoO(4)(2-) lability in soils determined using E and L value techniques (R(2)=0.98) suggesting E values provided a good measure of the potential plant available pool of MoO(4)(2-) in soils. A regression model was developed that indicates clay content and incubation time were the most important factors affecting the labile pool of MoO(4)(2-) in soils with time after addition (R(2)=0.70-0.75). The aging model developed suggests soluble MoO(4)(2-) will be removed into non-labile pools more rapidly with time in neutral to alkaline clay soils than in acidic sandy soils. Labile MoO(4)(2-) concentrations in molybdenum (Mo) contaminated soils was found to be <10% of the total Mo concentrations in soils.
Keywords: Molybdenum
E value
L value
Rights: Crown copyright © 2012
DOI: 10.1016/j.chemosphere.2012.05.013
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Appears in Collections:Agriculture, Food and Wine publications
Aurora harvest
Environment Institute publications

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