Principes de l'iodimétrie absorptiométrique

Herbo, Claude; Sigalla, J.

doi:10.1016/s0003-2670(00)87013-0

Cited by 14 publications

(4 citation statements)

References 16 publications

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“…The value of the extinction coefficient for the triiodide compound obtained in this work is 2676 m 2 /mol, which is in agreement with those reported in previous studies. ,− It was found that the Beer–Lambert law was valid up to an absorbance value of approximately 1.6 corresponding to a concentration in dynamic equilibrium of 5.910 × 10 –5 M of I 2 (initial concentration of 0.015 mg/mL) and 5.883 × 10 –5 M of I 3 .…”

Section: Methodssupporting

confidence: 92%

Characterization of the Hydrodynamics and Mixing Performance of a Split-and-Recombination (SAR) Prototype Microreactor and a Multilamination Commercial Microreactor

Méndez-Portillo

Fradette

Dubois

et al. 2011

Ind. Eng. Chem. Res.

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The aim of this work was to quantify the performance of two well-known mixing mechanisms used in microreactors: the split-and-recombination (SAR) and the multilamination by means of an interdigital structure. The residence time distribution (RTD) and the mixing performance in laminar flow regime were experimentally characterized by the tracer pulse-input technique and the iodide-iodate Villermaux/Dushman method. RTD analysis indicates bypassing caused by uneven flow distribution in the manifolds of both microreactors. A decrease of the quadratic dependence of axial dispersion on fluid velocity is produced by the improved tracer homogenization achieved in the microfluidic structures. The iodide-iodate method shows that below a critical Damk€ ohler number the microreactors exhibit a superior mixing performance than a conventional T-junction. The interdigital microreactor displayed the best mixing capabilities for all the flow conditions investigated. However, the estimation of energy dissipation confirms that the improved mixing performance of the interdigital unit is obtained at the expense of greater energy expenditure when compared with the split-and-recombination microreactor.

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Section: Methodssupporting

confidence: 92%

Characterization of the Hydrodynamics and Mixing Performance of a Split-and-Recombination (SAR) Prototype Microreactor and a Multilamination Commercial Microreactor

Méndez-Portillo

Fradette

Dubois

et al. 2011

Ind. Eng. Chem. Res.

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“…The analysis of the many determinations of K 1 , K 5 , and K 7 is detailed in the http://www.interscience.wiley.com/jpages/0538-8066/suppmat. In the temperature range 5–60°C, the effect of the temperature on the equilibrium constant of reaction (1) 30–39 can be represented by ln K ° 1 = A 1 + B 1 / T and there is no justification for a more complicated equation. We recommend A 1 = −1.46 and B 1 = −7990 K. A similar expression can be used for reaction (5) 32, 33, 35, 40–43 and we recommend A 5 = 0.20 and B 5 = 1900 K. The reported values of K 7 at 25°C are in accord 8, 38, 44–46.…”

Section: Thermodynamics Of Iodine Hydrolysismentioning

confidence: 99%

Inorganic reactions of iodine(+1) in acidic solutions

Schmitz

2004

Int J of Chemical Kinetics

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We present a thorough analysis of the former works concerning the hydrolysis of iodine and its mechanism in acidic or neutral solutions and recommend values of equilibrium and kinetic constants. Since the literature value for the reaction H 2 OI + HOI + H + appeared questionable, we have measured it by titration of acidic iodine solutions with AgNO 3 . Our new value, K(H 2 OI + HOI + H + ) ∼ 2 M at 25 • C, is much larger than accepted before. It decreases slowly with the temperature. We have also measured the rate of the reaction 3HOI → IO 3 − + 2I − + 3H + in perchloric acid solutions from 5 × 10 −2 M to 0.5 M. It is a second order reaction with a rate constant nearly independent on the acidity. Its value is 25 M −1 s −1 at 25 • C and decreases slightly when the temperature increases, indicating that the disproportionation mechanism is more complicated than believed before. An analysis of the studies of this disproportionation in acidic and slightly basic solutions strongly supports the importance of a dimeric intermediate 2HOI I 2 O·H

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“…To calibrate the spectrophotometer, a series of absorbance measurements were conducted on standard tri-iodide solutions. Guichardon et al have reviewed the extinction coefficient values, − which range from 2575 m 2 /mol to 2590 m 2 /mol, and measured an extinction coefficient of 2395.9 m 2 /mol. Hirshfeld established that the extinction coefficient varies over a range of 1894−2205 m 2 /mol when the water source is changed from RO water to deionized ultrafiltered water.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of a Confined Impinging Jet Reactor: Energy Dissipation, Homogeneous and Heterogeneous Reaction Products, and Effect of Unequal Flow

Siddiqui

Zhao

Kukuková

et al. 2009

Ind. Eng. Chem. Res.

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The confined impinging jet reactor (CIJR) has attracted wide interest in the past few years because of the efficient micromixing that it offers. In this work, the CIJR is characterized over a wide range of mixing conditions, using three measures of performance: estimates of the energy dissipation rate, micromixing efficiency based on the yield of a homogeneous reaction, and particle size resulting from a heterogeneous precipitation reaction. The energy dissipation results showed very good agreement between four methods, with values up to 100 times greater than those observed in stirred tanks. The reactions showed a higher sensitivity to mixing conditions at higher concentrations, with less effect of mixing at high flow rates. The operation of the CIJR was very robust to changes in flow rate, with stable performance for up to a 30% difference in the inlet flows.

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Principes de l'iodimétrie absorptiométrique

Cited by 14 publications

References 16 publications

Characterization of the Hydrodynamics and Mixing Performance of a Split-and-Recombination (SAR) Prototype Microreactor and a Multilamination Commercial Microreactor

Characterization of the Hydrodynamics and Mixing Performance of a Split-and-Recombination (SAR) Prototype Microreactor and a Multilamination Commercial Microreactor

Inorganic reactions of iodine(+1) in acidic solutions

Characteristics of a Confined Impinging Jet Reactor: Energy Dissipation, Homogeneous and Heterogeneous Reaction Products, and Effect of Unequal Flow

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