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Numerical simulation of iodine speciation in relation to water disinfection aboard manned spacecraft I. EquilibriaElemental iodine (I2) is currently used as the drinking water disinfectant aboard the Shuttle Orbiter and will also be incorporated into the water recovery and distribution system for the International Space Station Alpha. Controlled release of I2 is achieved using the Microbial Check Valve (MCV), a flow-through device containing an iodinated polymer which imparts a bacteriostatic residual concentration of approximately 2mg/L to the aqueous stream. During regeneration of MCV canisters, I2 concentrations of approximately 300 mg/L are used. Dissolved iodine undergoes a series of hydrolytic disproportionation and related reactions which result in the formation of an array of inorganic species including: I-, I3-, HOI, OI-, IO3-, HIO3, I2OH-, I2O(-2), and H2OI+. Numerical estimation of the steady-state distribution of inorganic iodine containing species in pure water at 25 degrees C has been achieved by simultaneous solution of the multiple equilibrium expressions as a function of pH. The results are reported herein.
Document ID
20040089466
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Authors
Atwater, J. E.
(UMPQUA Research Company Myrtle Creek, Oregon 97457, United States)
Sauer, R. L.
Schultz, J. R.
Date Acquired
August 21, 2013
Publication Date
September 1, 1996
Publication Information
Publication: Journal of environmental science and health. Part A, Environmental science and engineering & toxic and hazardous substance control
Volume: A31
Issue: 8
ISSN: 1077-1204
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: NAS9-18361
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Environmental Health
NASA Center JSC

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