The Rate of the Reaction between Iodic and Hydriodic Acids

Dushman, Saul

doi:10.1021/j150061a001

Cited by 160 publications

(117 citation statements)

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“…Motivated by these obvious discrepancies, we found (after a thorough review of literature) that iodate might be reduced by pH-dependent reactions that are part of the complex system of the Dushman reaction (Dushman, 1904). The complicated kinetics of this reaction (net reaction: IO − 3 +5I − +6H + −→3I 2 +3H 2 O) has been subject of many studies for over a century (see e.g.…”

Section: Model Descriptionmentioning

confidence: 99%

Modelling iodide – iodate speciation in atmospheric aerosol: Contributions of inorganic and organic iodine chemistry

2007

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Abstract. The speciation of iodine in atmospheric aerosol is currently poorly understood. Models predict negligible iodide concentrations but accumulation of iodate in aerosol, both of which is not confirmed by recent measurements. We present an updated aqueous phase iodine chemistry scheme for use in atmospheric chemistry models and discuss sensitivity studies with the marine boundary layer model MIS-TRA. These studies show that iodate can be reduced in acidic aerosol by inorganic reactions, i.e., iodate does not necessarily accumulate in particles. Furthermore, the transformation of particulate iodide to volatile iodine species likely has been overestimated in previous model studies due to negligence of collision-induced upper limits for the reaction rates. However, inorganic reaction cycles still do not seem to be sufficient to reproduce the observed range of iodide -iodate speciation in atmospheric aerosol. Therefore, we also investigate the effects of the recently suggested reaction of HOI with dissolved organic matter to produce iodide. If this reaction is fast enough to compete with the inorganic mechanism, it would not only directly lead to enhanced iodide concentrations but, indirectly via speed-up of the inorganic iodate reduction cycles, also to a decrease in iodate concentrations. Hence, according to our model studies, organic iodine chemistry, combined with inorganic reaction cycles, is able to reproduce observations. The presented chemistry cycles are highly dependent on pH and thus offer an explanation for the large observed variability of the iodide -iodate speciation in atmospheric aerosol.

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Section: Model Descriptionmentioning

confidence: 99%

Modelling iodide – iodate speciation in atmospheric aerosol: Contributions of inorganic and organic iodine chemistry

2007

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“…Reaction of ICl with NaOH Figure 5 shows a series of uv-visible spectra obtained as a function of time using reaction [4]. The spectrum obtained at times close to mixing is due to the hypoiodite ion, I 0 (14).…”

Section: Ultraviolet-visible Spectrophotometrymentioning

confidence: 99%

“…Reaction of ICl with NaOH The iodide concentration, monitored using an iodide-specific electrode for reaction [4], is shown in Fig. 9(a).…”

Section: Lodide-specijic Electrode Measurementsmentioning

confidence: 99%

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Iodine chemistry in the +1 oxidation state. II. A Raman and uv–visible spectroscopic study of the disproportionation of hypoiodite in basic solutions

Wren¹,

Paquette²,

Sunder³

et al. 1986

Can. J. Chem.

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The kinetics of disproportionation of elemental iodine to iodide and iodate ions has been studied in basic aqueous media using Raman and uv-visible spectroscopy. The I 0 stretching vibrations for 10-and 120H-were observed at 430 i 2 and 560 + 2 cm-', respectively. The totally symmetric stretching vibration for 107 was observed at 685 i 2 c m l . The Raman results indicate that 120H-is a linear molecule with a stronger 1-0 bond than 1 0 . The rate expression at 25°C in 1 mol d m 3 NaOH was found to be whereThe reaction is primarily a reaction of thc iodine + 1 oxidation-state species 10-and 120H-. It proceeds through the t 3 oxidation-state species 1 0 7 . The following equilibrium and rate constants were determined:

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“…The iodide-iodate reaction system [7][8][9][10][11][12][13] was used to determine the degree of mixing in the microchannels. This method is based on a competitive parallel reaction system:…”

Section: Assessment Of the Degree Of Mixing In The Reaction Channelmentioning

confidence: 99%

A microreactor-based system for the study of fast exothermic reactions in liquid phase: characterization of the system

Schneider

Maeder

Ryser

et al. 2004

Chemical Engineering Journal

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A new system combining a microreactor and a microcalorimetric chip was investigated. The small size of the microreactor channel permits maintaining isothermal conditions necessary for the kinetic characterization of highly exothermic reactions. These conditions are not easily obtained in classical calorimetric systems. The degree of mixing in the microchannel, which plays an important role for the characterization of fast reactions, was determined experimentally using an iodate-iodide system and confirmed by calculations. The calorimetric system was calibrated by performing the neutralization reaction of NaOH with H 2 SO 4 in the microchannel. Several optimizations of the microreactor design allowed to raise the sensitivity of the system and to preheat the entering fluids. The results obtained were repeatable and reproducible. The establishment of the heat balance and the evaluation of the various resistances allowed a better global understanding of the system.

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The Rate of the Reaction between Iodic and Hydriodic Acids

Cited by 160 publications

References 0 publications

Modelling iodide – iodate speciation in atmospheric aerosol: Contributions of inorganic and organic iodine chemistry

Modelling iodide – iodate speciation in atmospheric aerosol: Contributions of inorganic and organic iodine chemistry

Iodine chemistry in the +1 oxidation state. II. A Raman and uv–visible spectroscopic study of the disproportionation of hypoiodite in basic solutions

A microreactor-based system for the study of fast exothermic reactions in liquid phase: characterization of the system

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