Bypass and hyperbole in soil science:A perspective from the next generation of soil scientists

International audienceWe, the co‐authors of this letter, are an international group of soil scientists at early career stages, from PhD students to postdoctoral researchers, lecturers, and research fellows with permanent positions. Here, we present our collective musings on soil research challenges and opportunities and, in particular, the points raised by Philippe Baveye (Baveye, 2020a, 2020b) and Johan Bouma (Bouma, 2020) on bypass and hyperbole in soil science. Raising awareness about these issues is a first and necessary step. To this end, we would like to thank Philippe Baveye and Johan Bouma for initiating this debate.......

Method development for metabolites analysis in IC-ESI/MS.

National audienc

PREPARATION DE COMPLEXES MOLECULAIRES CRISTALLISES DANS LA SERIE DES DERIVES DE CYCLODEXTRINES METHYLEES ET ETUDE DES MECANISMES DE RECONNAISSANCE CHIRALE PAR CHROMATOGRAPHIE EN PHASE GAZEUSE

ROUEN-BU Sciences (764512102) / SudocSudocFranceF

Couplage de la chromatographie ionique à la spectrométrie de masse : application à l’analyse de composés très polaires dans des matrices complexes

National audienc

Développement analytique en chromatographie ionique couplée à la spectrométrie de masse et application, à l’analyse de métabolites dans des matrices biologiques.

National audienc

Contribution of the SAR-AD™ chromatographic separation to assess bitumen aging

National audienc

Aging kinetic study of bitumen based on SAR-AD fractions

International audienc

Investigation of Oxidation Homogeneity in Asphalt Puck after Simulation of Long-Term Aging (Pressure Aging Vessel)

International audienceFor decades, it has been known that the creation of oxygenated functional groups, especially carbonyl and sulfoxide, is among the main causes of chemical aging and degradation of asphalt. However, is the oxidation of a bitumen homogeneous? The focus of this paper was to follow the oxidation phenomena through an asphalt puck during a pressure aging vessel (PAV) test. According to the literature, the asphalt oxidation process that leads to the creation of oxygenated functions can be divided into the following successive main steps: the absorption of oxygen in asphalt at the air/asphalt interface, diffusion into the matrix, and reaction with asphalt molecules. To study the PAV oxidation process, the creation of carbonyl and sulfoxide functional groups in three asphalts were investigated after various aging protocols by Fourier transform infrared spectroscopy (FTIR). From these experiments performed on different layers of asphalt puck, it was observed that PAV aging resulted in a nonhomogeneous oxidation level inside the entire matrix. Compared to the upper surface, the lower section exhibited carbonyl and sulfoxide indices 70% and 33% lower, respectively. Moreover, the difference in the oxidation level between the top and bottom surfaces increased when the thickness and viscosity of the asphalt sample increased

Apport de la chromatographie ionique capillaire pour l’analyse de biomarqueurs

International audienc