Gradient ion-pair chromatographic method for the determination of iron N,N '-ethylenediamine-di-(2-hydroxy-5-sulfophenylacetate) by high performance liquid chromatography-atmospheric pressure ionization electrospray mass spectrometry - Lucena Marotta, Juan Jose; Hernandez Apaolaza, Maria Lourdes; Yunta Mezquita, Felipe; Garcia-Marco, S; Cremonini, MA; Esteban, P; Placucci, G; Lucena, JJ (Journal Of Chromatography a, 2005)