36 research outputs found
Electrochemical oxidation of oxalic acid and hydrazinium nitrate on platinum in nitric acid media
Several studies in the literature have investigated the electrochemical effects of oxalic acid and hydrazine on various materials in neutral (pH buffered to 7), basic or weakly acidic media (pH 6). The present work proposes electrochemical techniques that allow for the study of the electrochemical behavior, on a Pt electrode, of oxalic acid and hydrazinium nitrate to better understand their oxidation mechanisms in a nitric acid medium at a pH below 1; in addition, some experiments were carried out to define an electrochemical method that would allow for the simultaneous detection of these species when present within process effluent in very acidic solutions. Some physical data regarding oxalic acid and hydrazinium nitrate were also determined: anodic oxidation of hydrazinium nitrate and oxalic acid were observed at 0.2 V and 0.7 V (vs. Ag/AgCl), respectively. The diffusion coefficients of hydrazinium nitrate and oxalic acid were found to be 5.2 Ă 10â6 and 2.9 Ă 10â7 cm2 sâ1, respectively. An experimental design approach demonstrated the influence of nitric acid concentrations on the diffusion coefficients of these species
Water analysis with the help of tensor canonical decompositions
Coopération universitaire et scientifique Franco-VietnamienneInternational audienceRaw data are collected in five measurement locations along the Var river. It is assumed that some locations interact with each other, whereas others do not. In such a context, we are interested in determining the contribution of each location and in better understanding the water exchanges that are involved. Organic components can also be identified thanks to methods such as Canonical Polyadic decompositions (CP) (sometimes known as Parafac), applied to 3D fluorescence spectra calculated from the collected samples. The expected impact is a more efficient detection of polluting matters in water
Trace elements as geochemical markers for surface waters and groundwaters of the Var River catchment (Alpes Maritimes, France)
Discussion sur l'organisation et les attributions des comités animée par les opinions de plusieurs membres, lors de la séance du 23 thermidor an II (10 août 1794)
Féraud Jean-Bertrand, BarrÚre de Vieuzac Bertrand, Cambon Pierre-Joseph, Poultier d'Elmotte François Martin. Discussion sur l'organisation et les attributions des comités animée par les opinions de plusieurs membres, lors de la séance du 23 thermidor an II (10 août 1794). In: Archives Parlementaires de 1787 à 1860 - PremiÚre série (1787-1799) Tome XCIV - Du 13 thermidor au 25 thermidor an II (31 juillet au 12 août 1794) Paris : Librairie Administrative P. Dupont, 1985. p. 436
Discussion sur l'ordre du jour de la séance, lors de la séance du 26 avril 1791
Féraud, Rabaud de Saint Etienne Jean- Paul, Rewbell Jean François, Prieur (de la Marne). Discussion sur l'ordre du jour de la séance, lors de la séance du 26 avril 1791. In: Archives Parlementaires de 1787 à 1860 - PremiÚre série (1787-1799) Tome XXV - Du 13 avril 1791 au 11 mai 1791. Paris : Librairie Administrative P. Dupont, 1886. pp. 345-346
Discussion sur l'ordre du jour de la séance, lors de la séance du 26 avril 1791
FĂ©raud, Rabaud de Saint-Ătienne Jean-Paul, Rewbell Jean François, Prieur de la Marne Pierre Louis. Discussion sur l'ordre du jour de la sĂ©ance, lors de la sĂ©ance du 26 avril 1791. In: Archives Parlementaires de 1787 Ă 1860 - PremiĂšre sĂ©rie (1787-1799) Tome XXV - Du 13 avril 1791 au 11 mai 1791. Paris : Librairie Administrative P. Dupont, 1886. pp. 345-346
Discussion concernant la division du département Est de la Provence, lors de la séance du 29 janvier 1790
Gossin Pierre François, Juigné de Lassigny Louis-Jean-Baptiste, Féraud, SieyÚs Emmanuel-Joseph. Discussion concernant la division du département Est de la Provence, lors de la séance du 29 janvier 1790. In: Archives Parlementaires de 1787 à 1860 - PremiÚre série (1787-1799) Tome XI - Du 24 décembre 1789 au 1er mars 1790. Paris : Librairie Administrative P. Dupont, 1880. p. 375