Low Uncertainty Fe Isotope Ratio Measurements in Seawater Samples by ICP-MS at Medium Mass Resolution.

Inductively coupled plasma mass spectrometry (ICP-MS) with variable mass resolution capabilities opened large perspectives for Fe isotopic measurements. Our presentation will introduce our experimental results concerning the best way of correcting for mass discrimination effects Fe isotope ration measurements in that kind of complex matrix samples. We observed that matrix and concentration matching conditions for the isotopic reference material used for calibration purposes could change the end result by up to 4 % as compared to more ordinary approaches. Furthermore, we observed severe instabilities during ICP-MS single measurement scans, under the form of ultra fast ¿spike¿ signals, which could undoubtedly be related to the presence of high amounts of salts in the samples. It turned out that failing to recognise the presence of such instabilities could lead to an additional shift of nearly 2 % of the end result. A method was designed purge the generated data from any outlier related to this phenomenon.

PETROV Ivan;  QUETEL Christophe; 

2006-01-23

Royal Society of Chemistry

JRC30352

https://publications.jrc.ec.europa.eu/repository/handle/JRC30352,