Development and validation of an analytical method for the determination of lead isotopic composition using ICP-QMS

作者：Rodriguez Salazar M T; Morton Bermea O; Hernandez Alvarez E; Garcia Arreola M E; Ortuno Arzate M T

来源：Geofisica Internacional, 2010, 49(3): 113-117.

• ICP-QMS
• lead isotope composition
• analytical methodology
• reference material

This work reports a method for the precise and accurate determination of Pb isotope composition in soils and geological matrices by ICP-QMS. Three reference materials (AGV-2, SRM 2709 and JSO-1) were repeatedly measured, using ICP-QMS instruments in order to assess the quality of this analytical procedure. Mass discrimination was evaluated for Pb/Pb with Pb isotope reference material NIST SRM 981, and the correction applied to the above mentioned reference materials to achieve good accuracy of the analytical methodology. An internal standardization using (205)Tl was employed to avoid instrumental drift. The measured isotope compositions of all analyzed reference material were comparable with the reported (JSO-1 and SRM 2709) and certified values (AGV-2). The accuracy results agreed in average within 0.002% for (207)Pb/(204)Pb and 0.825% for (207)Pb/(206)Pb. These data corroborate that ICP-QMS results to be reliable in terms of accuracy and precision, for the determination of the Pb isotopic compositions in soils and geological matrices.

• 出版日期2010-9