Sr isotope analysis of groundwater at the Radiogenic Isotope Laboratory of the Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli - Osservatorio Vesuviano

In this work we present the first results obtained by analyzing the Sr isotope composition of two mineral waters, selected groundwater samples from Mt. Etna and a certified water sample from North America (National Research Council Canada - NRC, Certified Reference Materials - CRM TM-25.4). On the contrary, the Nd isotope ratios of such water samples have been not measured due to the low Nd content of the investigated samples. A statistically representative data set on certified international standards (NIST SRM 987, La Jolla and JNdi-1) was used to evaluate the quality of the analytical data produced at the INGVOV Radiogenic Isotope Laboratory since 2014. This methodological approach will allow us to isotopically characterize different water systems with the aim to trace back the water-rock interaction and mixing processes in different environments. This analytical procedure could be exported to other geological contests and applied to other types of waters (e.g. surface and thermal water).