Fit for Purpose Validated Method for the Determination of the Strontium Isotopic Signature in Mineral Water Samples by Multi-collector Inductively Coupled Plasma Mass Spectrometry

A method allowing the routine determination of n(87Sr)/n(86Sr) with five meaningful decimal digits in mineral water samples is described. it is based on 2 consecutive chromatographic separations of Sr associated to multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) measurements. Separations are performed using commercial pre-packed columns filled with "Sr resin" to overcome isobaric interferences affecting he determination of strontium isotope ratios. All parameters influencing both chromatographic separations and MC-ICPMS measurements were investigated. Method validation included the test on a synthetic sample made of an aliquot of the NIST SRM 987 certified reference material (CRM) dispersed in a saline matrix to mimic complex samples. A relative difference of about 84 'ppm' was systematically observed between measured and certified values of the NIST SRM 987 CRM. This difference contributed to about 90% in the comprehensive uncertainty budget estimated for these results (e.g. typically 150 'ppm' relative, k=2). This method is thus fit for the purpose of authenticating samples originating from different geological backgrounds and was applied to eleven French mineral waters.

BRACH-PAPA Christophe;  VAN BOCXSTAELE Marleen;  PONZEVERA Emmanuel;  QUETEL Christophe; 

2009-05-05

PERGAMON-ELSEVIER SCIENCE LTD

JRC47671

0584-8547,   

http://dx.doi.org/10.1016/j.sab.2009.01.012,    https://publications.jrc.ec.europa.eu/repository/handle/JRC47671,   

10.1016/j.sab.2009.01.012,