Abstract: The present invention relates to a method for analyzing a liquid sample by injection of the latter into a reaction loop coupled with illumination means and detection means, which comprises the following steps: filling a reaction loop (42) with a minimum volume of the sample to be analyzed, this reaction loop forming a transparent pipe with which detection means are coupled, injecting a fixed volume of at least one reagent into the reaction loop (42), detecting levels of filtered light by these detection means (41), discharging reagents located in the reaction loop (42). The present invention also relates to a system for analyzing a liquid sample.

Abstract: The invention concerns the production of a chemical sensor which can be used to measure nitric acidity. This sensor is produced using a sol-gel method for depositing a porous film, containing a colored indicator, on the core of an optic fiber. The pH of the initial sol is adjusted as are other conditions for implementing the sol-gel method to obtain stability of the signal (curves 1 to 4) emitted by the sensor in an 8N nitric medium for at least 1000 hours.

Abstract: The invention concerns the production of a chemical sensor which can be used to measure nitric acidity.

Abstract: An apparatus for the analysis of a solution by X-ray fluorescence.This apparatus includes means (12, 14) for the excitation and analysis of the solution, means (4) for receiving the solution and an element (6) integral with the receiving means and positioned opposite an area of the receiving means which is transparent to the X-radiation, the element when it is excited, emitting an X-radiation distinct from that emitted by the solution, which allows any measurement drift that is liable to occur to be corrected during the analysis.Application to the analysis of solutions containing actinides.

Abstract: The present invention relates to a homogeneous process for the detection and/or determination of an analyte in a medium in which it may be present, by disclosing the reaction product of the analyte and a corresponding receptor, process consisting in: 1) adding to said medium a first reagent consisting of a receptor for the said analyte; 2) adding a second reagent consisting of at least one of the components of the reaction product of the analyte and at least one of its receptors; one of the two reagents being coupled with a luminescent compound and the other reagent possessing a heavy atom or units containing a heavy atom; 3) incubating the medium after addition of each reagent or after the addition of both reagents; 4) exciting the resulting medium and 5) measuring at equilibrium or during the kinetics, the signal emitted by the luminescent compound, said signal being modulated by the heavy atom effect.