Spectrophotometric determination of ozone in solutions: Molar absorption coefficient in the visible region

摘要

A new approach for the determination of ozone concentration in solutions in organic liquids based on spectrophotometric absorbance measurements in the visible region was proposed and substantiated. The molar absorption coefficient of ozone in the absorption maximumat similar to 600 nm is 8.0 mol(-1) L cm(-1) for hydrocarbons (hexane, heptane, isooctane), CHCl3 and CCl4, and 5.3 mol(-1) L cm(-1) for methanol and 4.5 mol(-1) L cm(-1) for water (+/- 10%). The coefficient monotonically decreases with increasing dielectric constant of the liquid. The low molar absorption coefficient allows the use of spectrophotometric measurements for determination of high ozone concentrations ranging from approximately 1.10(-2) mol L-1 up to 1.0 mol L-.(-1) (C) 2019 Elsevier B.V. All rights reserved.