In the present case we report the determination of the content of iobitridol in an injectable aqueous solution (Fig. 1). Iobitridol is an iodine based contrast medium approved in Europe and in the USA for radiographic diagnostic imaging in adult and children. No EP or USP monograph for iobitridol is available though similar substances such as iodixanol, iohexol, iopamidol, iopromide, iotrolan, iopanoic acid, iotalamic acid and ioxaglic acid are reported in EP. For the large majority of them the assay is estimated by potentiometric titration of iodine after a work up consisting of three operational steps (reduction by Zn, boiling, filtration).