Determination of SO2 in food, especially grain. By adding hydrochloric acid, the SO2 is moved out of the sample and absorbed in the behrotest absorption vessel perhydrole (H2O2). H2O2 is boiled and the solution titrated.
Function: The determination takes place through azeotropic distillation. For this, various sample materials xylene or toluene is added. In the vaporous phases the solvent binds with the water and after condensation, the water is separated from the solvent in a measuring tube.