Concentration Determination of Volatile Molecular Iodine and Methyl Iodide. (20th May 2018) - Kim, TaeJun
Abstract : Appropriate and reliable methods are necessary for routine determination of the concentrations of molecular iodine (I2 ) and methyl iodide (CH3 I), and methods including ultraviolet–visible spectrophotometry on aqueous solution samples for I2 detection and gas chromatography on toluene solution samples for CH3 I detection may be used. In this study, we examined the adequacy of the existing spectrophotometric method in terms of absorption coefficients at specific light wavelengths for several pH values of the aqueous solutions and selected iodide ion concentrations, and confirmed it finding no dependence of the absorption coefficients on the solution pH and the iodide ion concentration. Additionally, we established methods for CH3 I analysis using toluene as a sampling solvent for either capture of CH3 I from a gaseous solution or extraction of CH3 I from an aqueous solution, and found that using gas‐tight syringes, CH3 I could be extracted without a significant CH3 I loss even at ambient temperature. Abstract :