2026-04-17T10:26:46Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/58262023-06-08T12:49:03Zcom_10259_5827com_10259_5086com_10259_2604com_10259_5495com_10259_3844com_10259_3596com_10259_4249col_10259_5828col_10259_5496col_10259_3845col_10259_3597col_10259_4250

00925njm 22002777a 4500 dc García Tojal, Javier author Iriarte Avilés, Eneko author Palmero Díaz, Susana author Pedrosa Sáez, María de los Remedios author Rad Moradillo, Juan Carlos author Sanllorente Méndez, Silvia author Zuluaga, María Cruz author Cavia Saiz, Mónica author Rivero Pérez, Maria Dolores author Muñiz Rodríguez, Pilar author 2021-04 Kaolinite-rich Cretaceous clay sediment samples from Burgos (Spain) have been analyzed by elemental analysis, X-ray fluorescence, inductively coupled plasma mass spectrometry, X-ray diffraction and different spectroscopic techniques, as Fourier Transform Infrared, ultraviolet–visible and electron paramagnetic resonance. The clay sediment samples mainly contain quartz, muscovite and kaolinite. Different radicals, as A- and B-Centers in kaolinite and organic paramagnetic species, are detected. An illite/kaolinite FTIR band ratio parameter (IKB) is proposed to infer the illite/kaolinite proportion, which can be useful to graphically visualize the iron-substituted Al(III) sites. Studies of the activity as scavengers of DPPH and ABTS radicals show that samples with a larger amount of orthorhombic Fe(III) ions replacing Al(III) ions exhibit a higher antioxidant capacity. 1386-1425 http://hdl.handle.net/10259/5826 10.1016/j.saa.2021.119472 Clay minerals Electron paramagnetic resonance Infrared spectroscopy Infrared spectroscopy X-ray diffraction Antioxidant capacity Phyllosilicate-content influence on the spectroscopic properties and antioxidant capacity of Iberian Cretaceous clays