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Application of a Redox Gradostat Reactor for Assessing Rhizosphere Microorganism Activity on Lambda-Cyhalothrin

Abstract

Bacterial activity on pesticides can lead to decreased toxicity or persistence in aquatic systems. Rhizosphere activity is difficult to measure in situ. To mimic rhizosphere properties of the soft rush, Juncus effusus, a single-stage gradostat reactor was developed to study cycling of lambda-cyhalothrin by rhizobacteria and the effects of Fe(III) and citrate, both common in wetland soil, on lambda-cyhalothrin degradation. Redox gradient changes, greater than ±10 mV, were apparent within days 5–15 both in the presence and absence of ferric citrate. Through the production of a redox gradient (p < 0.05) by rhizobacteria and the ability to measure pesticide loss over time (p < 0.05), reactors were useful in expanding knowledge on this active environment.

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Acknowledgments

Mention of equipment, software or pesticide trade names does not constitute an endorsement for use by the USDA. All programs and services of the USDA are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, marital status, or handicap.

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Correspondence to T. J. Peacock.

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Peacock, T.J., Mikell, A.T., Moore, M.T. et al. Application of a Redox Gradostat Reactor for Assessing Rhizosphere Microorganism Activity on Lambda-Cyhalothrin. Bull Environ Contam Toxicol 92, 347–351 (2014). https://doi.org/10.1007/s00128-014-1202-0

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Keywords

  • Wetlands
  • Juncus effusus
  • Pyrethroid insecticide