Abstract: A method for purifying a minority constituent and concentrating it in a majority constituent of a gas mixture that also contains one or more other minority constituent(s) employs (i) a selective permeation step, (ii) next, a purification step, and (iii) finally a concentration step. In the selective permeation step, an initial gas mixture is passed through a membrane to yield a gas mixture that is enriched in the first minority constituent. In the purifying step, the first minority constituent is absorbed by a solid adsorbent which has a strong affinity for the first minority constituent, then following an elution step, a gas mixture that contains essentially only the majority constituent and the first minority constituent is formed.

Abstract: The invention relates to a process for the chemical logging of a liquid and to an installation for performing the process. An object of the invention is to develop a process which makes it possible to carry out precise cartographies of chemical elements present in a liquid. This object is achieved with the aid of a process which includes performing a continuous sampling or removal of the liquid to be analyzed by way of a pipe moved progressively in the interior of the liquid. The pipe is provided with a pump which makes it possible to return the liquid to the surface, perform analyses on the samples and calculate for each analysis result the depth at which the sampling operation was carried out. The invention is more particularly used in boreholes, wells or oceanography.