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Laboratory study of retention and release of weak acid herbicide MCPA by soils and sediments and leaching potential of MCPA

Author

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  • E. Hiller

    (Department of Geochemistry, Faculty of Natural Sciences, Comenius University Bratislava, Slovak Republic)

  • M. Khun

    (Department of Geochemistry, Faculty of Natural Sciences, Comenius University Bratislava, Slovak Republic)

  • L. Zemanová

    (Department of Geochemistry, Faculty of Natural Sciences, Comenius University Bratislava, Slovak Republic)

  • Ľ. Jurkovič

    (Department of Geochemistry, Faculty of Natural Sciences, Comenius University Bratislava, Slovak Republic)

  • M. Bartaľ

    (National Water Reference Laboratory for Slovakia, Water Research Institute Bratislava, Slovak Republic)

Abstract

MCPA sorption and desorption in five surface soils (denoted as A1-5), three bottom sediments (S1-3), two river sediments (L1-2) and one subsurface soil (SS) at two initial concentrations in aqueous solution - C0 = 0.5 and 10 mg/l were studied. No significant effect of the initial concentration on MCPA equilibrium distribution between soil/sediment and aqueous solution was observed. The difference between distribution coefficient KD at C0 = 0.5 mg/l and KD at C0 = 10 mg/l was found only in the case of one bottom sediment (S2). A simple regression analysis between KD at C0 = 0.5 and 10 mg/l and soil/sediment properties indicated that the most important property which determined the variation in MCPA sorption is organic carbon (r = 0.886*** and r = 0.926***, respectively). Similarly, desorption of MCPA was inversely proportional to organic carbon content of the soils and sediments used (r = -0.862* and r = -0.842**). These observations showed that MCPA sorption and desorption in soils and sediments were primarily controlled by organic components of the geosorbents used. Overall, the percentage of MCPA sorption in soils and sediments was low (Psorp ≍ 3-53%; KD = 0.077-2.827 l/kg) and the percentage of MCPA desorbed was relatively high (Pdes ≍ 11-70%), especially in the soils and sediments with lower organic carbon content. The experimental results and calculated values of groundwater ubiquity score GUS and relative leaching potential index RLPI imply that MCPA is very mobile in all the surface soils and has a potential to contaminate groundwater.

Suggested Citation

  • E. Hiller & M. Khun & L. Zemanová & Ľ. Jurkovič & M. Bartaľ, 2006. "Laboratory study of retention and release of weak acid herbicide MCPA by soils and sediments and leaching potential of MCPA," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 52(12), pages 550-558.
    • Handle: RePEc:caa:jnlpse:v:52:y:2006:i:12:id:3546-pse
    DOI: 10.17221/3546-PSE
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    References listed on IDEAS

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    1. R. Kodešová & J. Kozák & J. Šimůnek & O. Vacek, 2005. "Single and dual-permeability models of chlorotoluron transport in the soil profile," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 51(7), pages 310-315.
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    Cited by:

    1. Edgar Hiller & Ľubomír Jurkovič & Mikuláš Bartaľ, 2008. "Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 3(4), pages 231-240.

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