Method of continuous determination of dimethylformamide and dimethylamine in aqueous solutions, specifically in waste water

摘要

A description is given of a method for the continuous determination of dimethylformamide and/or dimethylamine in aqueous solutions, specifically in industrial waste water, which is characterised in that a constant subflow is continuously collected from the waste water flow, the subflow is subjected to alkaline hydrolysis under constant conditions using an alkaline solution added at a constant rate, the subflow is subjected to a partial evaporation under constant evaporation conditions, the resultant vapour flow is condensed by cooling, the electrical conductivity of the condensate is continuously determined in a flow-type measuring cell, and the measurements obtained are converted into the required concentration values using a calibration curve or known formulae. …IMAGE…