Degradability of atrazine, cyanazine, and dicamba in methanogenic enrichment culture microcosms using sediment from the Pearl River of Southern China

Chen Lin, Ji Guang Gu, Chuanling Qiao, Shunshan Duan, Ji Dong Gu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Degradation of three herbicides, atrazine, cyanazine and dicamba, was assessed in laboratory microcosms incubated under simulated methanogenic conditions using sediment from Pearl River of Southern China as an inoculum. Atrazine was much more resistant to degradation than cyanazine and dicamba over 300 days of incubation. Biodegradation of cyanazine and dicamba was further substantiated by establishment of enrichment transfer cultures in which the degradation of the respective herbicide was accelerated by the active microorganisms. Degradation of cyanazine initially involved the removal of chlorine and the two side chains, while that of dicamba was O-demethylation reaction forming 3,6-dichlorosalicyclic acid. Results suggest that biodegradation of xenobiotics can be established through enrichment culture transfer technique, and further mechanism of degradation and microorganisms involved can be elucidated.

Original languageEnglish
Pages (from-to)395-401
Number of pages7
JournalBiology and Fertility of Soils
Volume42
Issue number5
DOIs
StatePublished - Jun 2006
Externally publishedYes

Keywords

  • Atrazine
  • Cyanazine
  • Degradation
  • Dicamba
  • Enrichment
  • Herbicide
  • Methanogenic conditions

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