Je. Atwater et al., NUMERICAL-SIMULATION OF IODINE SPECIATION IN RELATION TO WATER DISINFECTION ABOARD MANNED SPACECRAFT .1. EQUILIBRIA, Journal of environmental science and health. Part A: Environmental science and engineering, 31(8), 1996, pp. 1965-1979
Elemental iodine (I-2) is currently used as the drinking water disinfe
ctant aboard the Shuttle Orbiter and will also be incorporated into th
e water recovery and distribution system for the International Space S
tation Alpha. Controlled release of I-2 is achieved using the Microbia
l Check Valve (MCV), a flow-through device containing an iodinated pol
ymer which imparts a bacteriostatic residual concentration of approxim
ate to 2mg/L to the aqueous stream. During regeneration of MCV caniste
rs, I-2 concentrations of approximate to 300mg/L are used. Dissolved i
odine undergoes a series of hydrolytic disproportionation and related
reactions which result in the formation of an array of inorganic speci
es including: I-, I-3(-), 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 achie
ved by simultaneous solution of the multiple equilibrium expressions a
s a function of pH. The results are reported herein.