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Biodegradation pathway of an anionic surfactant (Igepon TC-42) during recycling waste water through plant hydroponics for advanced life support during long-duration space missionsThe degradation of an anionic surfactant (Igepon TC-42) was investigated as part of an integrated study of direct recycling of human hygiene water through hydroponic plant growth systems. Several chemical approaches were developed to characterize the degradation of Igepon and to measure the accumulation of intermediates such as fatty acids and methyl taurine. Igepon was rapidly degraded as indicated by the reduction of methylene blue active substances (MBAS) and component fatty acids. The Igepon degradation rate continued to increase over a period of several weeks following repeated daily exposure to 18 micrograms/l Igepon. The accumulation of free fatty acids and methyl taurine was also observed during decomposition of Igepon. The concentration of methyl taurine was below detection limit (0.2 nmol/ml) during the slow phase of Igepon degradation, and increased to 1-2 nmol/ml during the phase of rapid degradation. These findings support a degradation pathway involving initial hydrolysis of amide to release fatty acids and methyl taurine, and subsequent degradation of these intermediates. Published by Elsevier Science Ltd on behalf of COSPAR.
Document ID
20040087849
Acquisition Source
Kennedy Space Center
Document Type
Reprint (Version printed in journal)
Authors
Levine, L. H.
(NASA Kennedy Space Center Cocoa Beach FL United States)
Kagie, H. R.
Garland, J. L.
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Advances in space research : the official journal of the Committee on Space Research (COSPAR)
Volume: 31
Issue: 1
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: NAS10-12180
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Life Support Systems
NASA Center KSC

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