Difluoromethane, a new and improved inhibitor of methanotrophy

Article Abstract:

Difluoromethane (DFM) levels were compared to the concentrations of acetylene and methyl fluoride needed for preventing methanotrophy. Findings showed that DFM is a more effective inhibitor at 30- to 50-times less concentrations than normally required for methyl fluoride. Advantages of DFM as inhibitor include its high solubility in water, being a reversible inhibitor and its inability to bind to surfaces and therefore does not need any unusual contamination prevention methods.

Methane, Methanobacteriaceae, Methanogens

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Selective inhibition of ammonium oxidation and nitrification-linked N2O formation by methyl fluoride and dimethyl ether

Article Abstract:

Headspace additions of CH3F and DME completely inhibited NO2 and N2O production from NH4+ during the incubation of Nitrosomonas europaea, whereas lower concentrations of these gases caused partial inhibition. In nitrified soil, CH3F and DME (dimethyl ether) limited N2O production. A 20 to 30-fold reduction of N2O in the soil was revealed in field experiments with surface flux chambers. CH3F also caused a reduction in NO3- + NO2- levels, increasing NH4+ levels in soils.

Research, Analysis, Bacteria, Fluorides

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Bacterial oxidation of methyl bromide in fumigated agricultural soils

Article Abstract:

Field and laboratory investigations were carried out to determine the fate of methyl bromide in the environment during and after fumigation. Results indicate that methyl bromide is degraded by bacteria able to utilize this chemical for their growth. Further, results show that maximum bacterial activity is observed during fumigation. Chloropicrin inhibits bacterial activity and the challenges this chemical pose are described.

Agricultural chemicals, Fungicides

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