Iodimetric determination of iodine or bromine in organic compounds using a 126-fold amplification method

Abstract

A method is described for the iodimetric micro-determination of iodine or bromine in organic compounds based on combustion in an oxygen flask using bromine or hypochlorite as absorbents to convert the combustion products of iodine or bromine into iodate and bromate ions, respectively. An excess of potassium iodide is added to the solution and the separation of the liberated iodine is performed on a polyurethane foam column. The collected iodine is then oxidised to iodate using an excess of periodate solution. Iodate in the effluent solution is then titrated iodimetrically after masking the excess of unreacted periodate with molybdate. The method is simple, rapid and can be employed for determination at sub-microgram levels.