Chloride methylation by plant pectin: an efficient, environmentally significant process

R. Kalin, J. Hamilton, C. McRoberts, F. Keppler, D.B. Harper

Research output: Contribution to journalArticlepeer-review

159 Citations (Scopus)


Atmospheric chloromethane (CH3Cl) plays an important role in stratospheric ozone destruction, but many uncertainties exist regarding the strengths of its sources and sinks and particularly regarding the processes generating this naturally occurring gas. Evidence is presented here that CH3Cl is produced in many terrestrial environments by a common mechanism. Abiotic conversion of chloride to CH3Cl occurs readily in plant material, with the widespread plant component pectin acting as a methyl donor. Significant CH3Cl emissions from senescent and dead leaves were observed at ambient temperatures; those emissions rose dramatically when temperatures increased. This ubiquitous process acting in terrestrial ecosystems and during biomass burning could contribute the bulk of atmospheric CH3Cl.
Original languageEnglish
Pages (from-to)206-209
Number of pages3
Publication statusPublished - Jul 2003


  • emissions
  • chloromethane
  • halocarbons
  • atmosphere
  • combustion
  • africa
  • matter
  • stratospheric ozone destruction


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