Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
244-256
Description:
JCR Journal
Description:
reserved
Keywords:
lcanic gas; sampling
;
acid gases
;
noncondensible gases
;
metallic trace elements
;
04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques
;
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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