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dc.creatorColon, Hector
dc.creatorButton-Denby, Amy
dc.creatorSteele, John
dc.creatorNelson, Jason
dc.date.accessioned2020-07-30T01:57:53Z
dc.date.available2020-07-30T01:57:53Z
dc.date.issued2020-07-31
dc.identifier.otherICES_2020_476
dc.identifier.urihttps://hdl.handle.net/2346/86477
dc.descriptionHector Colon, JSC Engineering, Technology, and Science (JETS) contract/Jacobs Technology, US
dc.descriptionAmy Button-Denby, JSC Engineering, Technology, and Science (JETS) contract/Jacobs Technology, US
dc.descriptionJohn Steele, JSC Engineering, Technology, and Science (JETS) Technologies, US
dc.descriptionJason Nelson, National Aeronautics and Space Administration (NASA), US
dc.descriptionICES303: Physio-Chemical Life Support- Water Recovery & Management Systems- Technology and Process Development
dc.descriptionThe proceedings for the 2020 International Conference on Environmental Systems were published from July 31, 2020. The technical papers were not presented in person due to the inability to hold the event as scheduled in Lisbon, Portugal because of the COVID-19 global pandemic.en_US
dc.description.abstractIonic silver is baselined for microbial control in spacecraft potable water systems for future exploration missions, but materials compatibility analysis is required to evaluate the passive depletion of ionic silver concentration onto wetted material surfaces over time. Various articles concerning such testing have been published that examine interactions with water containing ionic silver biocide, but most tests have focused on only a couple of materials each, and comparing results of different evaluations to one another has proved challenging. This paper reports the first results from static exposure testing of a large array of material coupons to a 400 parts per billion (ppb) aqueous silver fluoride (AgF) solution, using a surface to volume ratio of approximately 2/cm. The test is designed in two main stages. Stage 1 is a one-week screening solely for silver uptake. Materials that perform modestly to well after that week are promoted to Stage 2, which is a longer test with periodic sampling to examine the silver uptake rates over time; these samples are evaluated for other water quality parameters in addition to the remaining silver concentration. In a tangential investigation, select materials that take up some silver in Stage 1 may be “aged” by repeating the Stage 1 test to determine whether repeated exposure reduces silver uptake rate, and successfully aged materials may then continue to Stage 2 testing. The materials under test include metallic, and polymeric materials with various surface finishes, treatments, and coatings, as well as select other materials historically used in spacecraft water systems. This test began in August 2019, and thus only includes early results; future follow-on papers will include additional results as the test progresses. The ultimate goal builds a broad, easily comparable data set that can be used to guide material selections for silver biocide-compatible spacecraft water system design.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisher2020 International Conference on Environmental Systems
dc.subjectIonic silver biocide
dc.subjectMaterials compatibility
dc.subjectSpacecraft water system design
dc.titleEarly Results from a Broad Compatibility Study of Various Materials with Ionic Silver Biocide
dc.typePresentation


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