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Design and Construction of an Experimental Setup to Enhance Mineral Weathering through the Activity of Soil Organisms
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Aging effects on molybdate lability in soils.

Jason K Kirby1, Michael J McLaughlin, Yibing Ma

  • 1CSIRO Land and Water, Water for a Health Country Flagship, Contaminant Chemistry and Ecotoxicology Program, Waite Campus, Waite Road, Urrbrae, SA 5064, Australia. jason.kirby@csiro.au

Chemosphere
|June 19, 2012
PubMed
Summary
This summary is machine-generated.

Soil aging decreases molybdate (MoO(4)(2-)) lability over time, especially in clay-rich soils. Clay content and incubation significantly impact molybdate availability, influencing its removal into non-labile pools.

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Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Geochemistry

Background:

  • Soil aging influences the bioavailability of added metals by shifting them from labile to non-labile pools.
  • Understanding these transformations is crucial for assessing metal contamination and plant uptake in soils.

Purpose of the Study:

  • To investigate how soil aging affects the lability of soluble molybdate (MoO(4)(2-)).
  • To develop predictive models for molybdate lability changes over time in soils with diverse properties.

Main Methods:

  • Soils were amended with molybdate to specific concentrations (EC(10) and EC(90)) and incubated for up to 18 months.
  • Labile molybdate pools (E values) were measured and correlated with L values.
  • Regression models were developed using soil properties and incubation time.

Main Results:

  • Labile molybdate (E value) decreased with incubation time, particularly in high-clay soils.
  • E values strongly correlated with L values, validating E value as a measure of plant-available molybdate.
  • Clay content and incubation time were key predictors (R(2)=0.70-0.75) of molybdate lability changes.

Conclusions:

  • Soluble molybdate becomes less labile over time due to aging reactions, especially in neutral to alkaline clay soils.
  • Aging accelerates molybdate sequestration into non-labile pools compared to acidic sandy soils.
  • Labile molybdate constitutes less than 10% of total molybdenum in contaminated soils.