Conductometric Titration of Halides with EDTA in N, N-dimethylf ormamide and Determination of Organic Halides in Organic Substance

Abstract

Conductometric titration of organic halides such as benzyl chloride, benzoyl chloride and hydrogen chloride with EDTA were investigated in N, N-dimethylformamide(DMF). The observed molar ratio between these chlorides and EDTA was 1: 1.
The use of other solvents (DMSO, pyridine, etc.) did not give significant inflection points. Less than 1 v/v% of water gave no influence on this method, but the existence of chloride and metal ions gave positive error. The applicable concentration range of the method was about from 1×10^-3mol⋅dm^-3 to 5×10^-2mol⋅dm^-3
It seemed that the reaction was dependent on bond dissociation energy between carbon and halogen atoms in halides and could be titrated when this energy was less than about 3×10^-2 kJ⋅mol^-1.
The propo sed method can be applied to analysis of halides in oils.