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Transport of Surface-modified Carbon Nanotubes through a Soil Column
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Atrazine Transport through a Soil-Epikarst System.

R N Lerch, C G Groves, J S Polk

    Journal of Environmental Quality
    |October 2, 2018
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    Summary
    This summary is machine-generated.

    Atrazine herbicide transport to karst groundwater was delayed, with metabolites dominating loads. Soil processes control this movement, highlighting the need for improved farming practices to protect water quality.

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    Area of Science:

    • Environmental Science
    • Hydrology
    • Agricultural Science

    Background:

    • Row crop and livestock production contaminate karst aquifers.
    • Understanding contaminant transport in karst systems is crucial for groundwater protection.

    Purpose of the Study:

    • To investigate the transport of atrazine and its metabolites from field application to karst groundwater.
    • To analyze the factors controlling atrazine and metabolite movement in an epikarstic drainage system.

    Main Methods:

    • Monitoring atrazine, deethylatrazine (DEA), and deisopropylatrazine (DIA) concentrations in epikarst drains (WF-1 and WF-2) over 17 months.
    • Analyzing metabolite to atrazine ratios (DMAR) and correlating them with soil temperature.

    Main Results:

    • Atrazine concentrations spiked nearly two months after application, during a May 2011 rainfall event.
    • Atrazine, DEA, and DIA were detected in all samples; metabolites constituted 54-94% of total loads.
    • Seasonal DMAR patterns correlated with soil temperature, indicating soil sorption and degradation control transport.

    Conclusions:

    • Soil column processes (sorption and degradation) significantly delay atrazine transport to karst aquifers.
    • Weakly sorbed atrazine metabolites are transported to groundwater over extended periods.
    • Implementing sustainable agricultural practices like crop rotation and cover crops can improve groundwater quality in karst regions.