Potentiometric determination of water-soluble organic amides using tungstophosphoric heteropoly acid

A procedure is based on the potentiometric titration of water-soluble nitrogen-containing organic compounds with tungstophosphoric acid in an HCl solution using a polarized platinum microelectrode. The analytical range is between 0.4 and 65%. The presence of isobutanol and LiCl in industrial solutions has no effect on determination in a wide concentration range and allows the procedure to be used in the production of some synthetic fibers.