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Related Experiment Videos

Lindane degradation and effects on soil microbial activity

M Farghaly1, S M Zayed, F Mahdy

  • 1National Research Centre, Dokki, Cairo, Egypt.

Biomedical and Environmental Sciences : BES
|December 23, 1998
PubMed
Summary

Lindane degradation in Egyptian soils was slow, with minimal mineralization over 90 days. This persistent organochlorine insecticide also inhibited soil microbial activity, impacting carbon cycling.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Microbiology

Background:

  • Lindane, an organochlorine insecticide, has been widely used but its environmental fate and impact on soil ecosystems remain a concern.
  • Understanding lindane's persistence and effects on microbial activity is crucial for assessing soil health and potential risks.

Purpose of the Study:

  • To investigate the degradation rate and pathways of U-14C-lindane in two distinct Egyptian soil types under laboratory conditions.
  • To evaluate the impact of lindane on soil microbial activity using radiorespirometry.

Main Methods:

  • Laboratory incubation of U-14C-lindane in two Egyptian soils for 90 days.
  • Measurement of 14CO2 evolution to assess mineralization.
  • Analysis of methanol-extractable and unextractable radiocarbon.

Related Experiment Videos

  • Radiometric assessment of microbial respiration using U-14C-glucose.

    • Main Results:

    • Lindane mineralization was slow and limited, with only 3.5-5.5% of applied 14C converted to 14CO2 within 90 days.
    • Approximately 88% of the applied radiocarbon remained in the soils, with 33-37% unextractable and presumed bound.
    • Methanol extracts primarily contained lindane, with minor metabolites detected.
    • Low lindane concentrations initially suppressed microbial respiration, and significant inhibition occurred at 10 mg/kg.

    Conclusions:

    • Lindane exhibits slow degradation and limited mineralization in the studied Egyptian soils, indicating high persistence.
    • The insecticide binds significantly to soil components, reducing bioavailability.
    • Lindane negatively impacts soil microbial activity, potentially disrupting essential soil functions and carbon cycling.