Influence of natural, electrically netural lipids on the potentiometric responses of cation-selective polymeric membrane electrodes

Research results indicate that certain natural ubiquitous lipids may lead not only to emf drifts but also to substantial selectivity changes. Potentiometric, chromatographic, NMR, and mass spectrometric evidence did not reveal any major cationic interfering agents, and anionic interfering agents cannot trivially explain the consistently positive emf drifts.