Biodegradation of Guanidinium By Aquatic Microorganisms.
Technical rept. Jan 84-Sep 85,
ARMY MEDICAL BIOENGINEERING RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD
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The micorbial degradation of guanidinium was complete in surface water samples from various sites including two obtained in the vicinity of the Sunflower Army Ammunition Plant. Guanidinium degradation was characterized by lags prior to enhanced biodegradation and was considerably slower than degradation of the amino acid arginine. Microorganisms capable of utilizing guanidinium as a nitrogen source for growth and as a sole added carbon source could be generalized to all sites tested. The action of the microorganisms on guanidinium resulted in the mineralization of its carbon. Microorganisms adapted to grow on guanidinium in laboratory cultures used it at a slower rate than two xenobiotic compounds considered to be readily metabolizable. In environmental water samples, short term guanidinium biodegradation was 20 times slower than that of urea. Following long-term incubation, the development of populations capable of enhanced guanidinium biodegration was concentration dependent and could not be demonstrated at or below 0.01a microgramsmL. The removal of guanidinium from surface waters by microbial action will likely be slow.
- Water Pollution and Control