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https://hdl.handle.net/2440/73979
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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 1879-1298 |
Statement of Responsibility: | 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 Aging Lability E value L value Regression |
Rights: | Crown copyright © 2012 |
DOI: | 10.1016/j.chemosphere.2012.05.013 |
Published version: | http://dx.doi.org/10.1016/j.chemosphere.2012.05.013 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest Environment Institute publications |
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