• ICP-MS
• Pb isotope ratios

This study can be divided in two main parts, both involving ICP-MS metals measurements.
The first part of this work focused on the evaluation of the trace metal pollution of some sediments and biota samples, coming from different areas and collected for wider and complete monitoring projects. The data obtained were used as complementary tools for the evaluation of Lead isotope ratios with a new methodology, which is described in the second part.
The aim of the second part was to enhance the capabilities of HR-ICP-MS (High Resolution-Inductively Coupled Plasma Mass Spectrometry) for accurate and precise lead isotope ratios measurements in marine environmental samples (sediments and biota). The precise and accurate determination of Pb isotope ratios is important for different application fields, especially for the investigation of lead isotope variation for environmental monitoring in order to trace the sources of pollution or contamination.
Measurement of 204Pb is particularly problematic as it is the least abundant of the four stable Pb isotopes and is subject to significant isobaric interference during analysis from 204Hg, derived from both sample matrices and from plasma and sweep gas supplies. Although Multi Collector ICP-MS is the technique usually preferred for precise isotope ratios determinations, a methodology has been developed for Nu Attom single collector instrument. Particularly for biota samples, Pb isotopic ratios measurement is a very new topic, and its application may represent a powerful tool for environmental monitoring.