A new method for sampling fumarolic gases: analysis of major, minor and metallic trace elements with ammonia solutions

A new method using ammonia solutions in pre-evacuated quartz bottles has been experimented for volcanic gas sampling and analysing. Various tests (reproducibility, variability and comparison with known methods such as NaOH pre-evacuated bottles and acid condensates) have been performed to check for their efficiency. By using ammonia solutions, acid gases (St, HCl, HF), carbon dioxide, noncondensible gases (N2, Ar, …) and metallic trace elements (MTE) can be measured with standard methods (HPLC, GC, titrimetry, ICP-MS). Results showthat acid gases, CO2 and noncondensible gases are sampled and analysedwith similar efficiency inNH4OHbottles than by using the known and accurate NaOH method.Moreover, a key point is that NH4OH solutions, after undergoing adequate processing (oxidation and acidification) allow also precise MTE measurements by using standard ICP-MS methods. Such MTE measurements appear much more reliable than those performed on acid condensates. Pre-evacuated ammonia bottles appear therefore as an optimum tool to collect volcanic gases and to obtain their complete chemical composition

Etude préléminaire sur le caractérisation du sous oxyde de bore (B6O) au moyen de la réaction 16O (31H, 10n)18F

International audienc

A compilation of silicon and thirty one trace elements measured in the natural river water reference material SLRS-4 (NRC-CNRC)

Le standard d'eau de rivière SLRS-4 (NRC-CNRC, National Research Council-Conseil National de Recherches Canada) est analysé régulièrement comme contrôle qualité par six laboratoires français étudiant les éléments majeurs et en traces dans les solutions naturelles. La plupart des mesures sont réalisées par ICP-MS (Inductively Coupled Plasma- Mass Spectrometry). Le silicium et 31 éléments en traces (terres rares, Ag, B, Br, Cs, Ga, Ge, Li, P, Pd, Rb, Se, Th, Ti, Tl, W, Y and Zr) ne sont pas certifiés par NRC-CNRC. Nous proposons des valeurs de compilation pour ces éléments ainsi que les incertitudes associées d'après les concentrations moyennes obtenues par chaque laboratoire

Determination of the composition of homogeneous light element binary compounds using charged particle induced nuclear reactions

International audienceIn this paper we describe the application of nuclear reactions induced by charged particles for the instrumental analysis of homogeneous binary compounds. The principle of a very accurate method of calibration, the "average stopping power" method, is given. The overall accuracy of the analytical results is discussed, and examples of analysis are given