Page 316. Bacterial Cycling of Methyl Halides HENDRIK SCHAFER,* LAURENCE G. MILLER,{RONALD S. ORE... more Page 316. Bacterial Cycling of Methyl Halides HENDRIK SCHAFER,* LAURENCE G. MILLER,{RONALD S. OREMLAND,{AND J. COLIN MURRELL* * Department of Biological Sciences, University of Warwick Coventry CV4 ...
The oxidation of [(sup14)C]methyl bromide ([(sup14)C]MeBr) to (sup14)CO(inf2) was measured in fie... more The oxidation of [(sup14)C]methyl bromide ([(sup14)C]MeBr) to (sup14)CO(inf2) was measured in field experiments with soils collected from two strawberry plots fumigated with mixtures of MeBr and chloropicrin (CCl(inf3)NO(inf2)). Although these fumigants are considered potent biocides, we found that the highest rates of MeBr oxidation occurred 1 to 2 days after injection when the fields were tarped, rather than before or several days after injection. No oxidation of MeBr occurred in heat-killed soils, indicating that microbes were the causative agents of the oxidation. Degradation of MeBr by chemical and/or biological processes accounted for 20 to 50% of the loss of MeBr during fumigation, with evasion to the atmosphere inferred to comprise the remainder. In laboratory incubations, complete removal of [(sup14)C]MeBr occurred within a few days, with 47 to 67% of the added MeBr oxidized to (sup14)CO(inf2) and the remainder of counts associated with the solid phase. Chloropicrin inhibit...
Measurements of benthic fluxes have been made on four occasions between February 1980 and Februar... more Measurements of benthic fluxes have been made on four occasions between February 1980 and February 198 1 at a channel station and a shoal station in South San Francisco Bay, using in situ flux chambers. On each occasion replicate measurements of easily measured ...
Page 316. Bacterial Cycling of Methyl Halides HENDRIK SCHAFER,* LAURENCE G. MILLER,{RONALD S. ORE... more Page 316. Bacterial Cycling of Methyl Halides HENDRIK SCHAFER,* LAURENCE G. MILLER,{RONALD S. OREMLAND,{AND J. COLIN MURRELL* * Department of Biological Sciences, University of Warwick Coventry CV4 ...
The oxidation of [(sup14)C]methyl bromide ([(sup14)C]MeBr) to (sup14)CO(inf2) was measured in fie... more The oxidation of [(sup14)C]methyl bromide ([(sup14)C]MeBr) to (sup14)CO(inf2) was measured in field experiments with soils collected from two strawberry plots fumigated with mixtures of MeBr and chloropicrin (CCl(inf3)NO(inf2)). Although these fumigants are considered potent biocides, we found that the highest rates of MeBr oxidation occurred 1 to 2 days after injection when the fields were tarped, rather than before or several days after injection. No oxidation of MeBr occurred in heat-killed soils, indicating that microbes were the causative agents of the oxidation. Degradation of MeBr by chemical and/or biological processes accounted for 20 to 50% of the loss of MeBr during fumigation, with evasion to the atmosphere inferred to comprise the remainder. In laboratory incubations, complete removal of [(sup14)C]MeBr occurred within a few days, with 47 to 67% of the added MeBr oxidized to (sup14)CO(inf2) and the remainder of counts associated with the solid phase. Chloropicrin inhibit...
Measurements of benthic fluxes have been made on four occasions between February 1980 and Februar... more Measurements of benthic fluxes have been made on four occasions between February 1980 and February 198 1 at a channel station and a shoal station in South San Francisco Bay, using in situ flux chambers. On each occasion replicate measurements of easily measured ...
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