MICROBIAL DEGRADATION AND ACCUMULATION OF PESTICIDES IN AQUATIC SYSTEMS

The purpose of this research was to study the action of classes of microorganisms (bacteria, fungi, and algae) on selected pesticides. The investigations included two areas: rates and products of degradation of pesticides by micro- organisms; and sorption of pesticides by microorganisms. Pesticides studied were malathion, butoxyethyl ester of 2,4-dichlorophenoxyacetic acid (2,4-DBE), methoxychlor, atrazine, diazinon, captan, and parathion, and toxaphene. Pesticide degradation products were identified using gas liquid chromatography-mass spectrometry. Full details are provided on test materials and other methods. Results show the following: Malathion and 2,4-DBE were found to undergo transformation readily in both bacterial and fungal cultures. Carbaryl underwent chemical hydrolysis to a-naphthol in both heterogeneous bacterial cultures and uninoculated controls. Bacterial degradation of methoxychlor was slower than bacterial degradation of malathion or 2,4-DBE. The insecticide was metabolized to methoxychlor-DDE. Rapid and extensive sorption of pesticides to fungi, bacteria, and algae was observed with methoxychlor and toxaphene, but not with any of the other pesticide investigated. Captan underwent neither microbial degradation nor sorption because of its rapid hydrolysis in water.

  • Supplemental Notes:
    • Ecology Research Series.
  • Corporate Authors:

    Environmental Protection Agency

    Dallas, TX  United States  75202
  • Authors:
    • Paris, D F
    • Lewis, D L
    • Barnett Jr, J T
    • Baughman, G L
  • Publication Date: 1975-3

Media Info

  • Features: References;
  • Pagination: 46 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00139887
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: N660/3-75-007
  • Files: TRIS
  • Created Date: Oct 6 1976 12:00AM