Application of a redox gradostat reactor for assessing rhizosphere microorganism activity on lambda-cyhalothrin.
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.
Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok, Thailand, trent.j.peacock.mil@mail.mil.
T J
TJ
Peacock
A T
AT
Mikell
M T
MT
Moore
S
S
Smith
D019149:Bioreactors / Q000382:microbiology; D005290:Ferric Compounds / Q000032:analysis / Q000378:metabolism; D019684:Magnoliopsida; D009570:Nitriles / Q000032:analysis / Q000378:metabolism*; D010084:Oxidation-Reduction; D010575:Pesticides / Q000032:analysis / Q000378:metabolism*; D011722:Pyrethrins / Q000032:analysis / Q000378:metabolism*; D058441:Rhizosphere; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D053833:Wetlands
D005290:Ferric Compounds; D009570:Nitriles; D010575:Pesticides; D011722:Pyrethrins; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; C025314:ferric citrate; C037304:cyhalothrin