Aerobic degradation, release

A detailed description of the aerobic degradation of LAS was provided by Swisher [10] and Schoberl [76], The majority of the laboratory studies published have indicated that metabolism starts with oxygenation of one of the terminal methyl groups of the alkyl chain and the conversion of the alcohol to a carboxylic group (w-oxidation), releasing an SPC with the same number of carbon atoms in the side-chain as in the original LAS isomer (Fig. 5.1.2) [77,78],... 

Thiophenes. Although several attempts have been made to demonstrate the aerobic degradation of thiophene, none have succeeded (39-41). However, the anaerobic metabolism of thiophene was reported by Kurita et al. (42). Hydrogen sulfide was released from thiophene when bacterial cultures, obtained from oil sludges, were grown with polypeptone. The fate of the carbon atoms was not determined but they could not be found as lower hydrocarbons (C to C4). 

If released to the environment, EGBE is expected to preferentially partition to the soil and water. Bioconcentration and bioaccumulation potential are expected to be low, based on the estimated bioconcentration factor and experimental octanol water partition coefficient. If released to soil or water, aerobic degradation is expected to occur rapidly. Volatilization may be an important fate and transport process based on the Henry s law constant and vapor pressure. When released into the water, EGBE is expected to have a half-life of <10 days. When released into the air, it is expected to have a half-life... 

Cultures of bacteria Arthrobacter s. ) and fungi Fusarium oxysporm) have been shown to aerobically degrade C-DMSD with release of 002. Lehmann et studied the fate of DMSD in a grass and soil system and... 

The biodegradability of mixtures is evaluated by way of a respirometiy. The rate of biodegradation is deduced from the aerobic degradation of the formulations in soil at 28°C. The principle of this test is volumetric dosing of the amonnt of CO2 released by the respiration of the micro-organisms present in the soil, nsing the available carbon as a nutrient. 

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