Towards the development of a fossil bone geochemical standard: An inter-laboratory study

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• 作者：V. Chavagnac ; J.A. Milton ; D.R.H. Green ; J. Breuer ; O. Bruguier ; D.E. Jacob ; T. Jong ; G.D. Kamenov ; J. Le Huray ; Y. Liu ; M.R. Palmer ; S. Pourtalè ; s ; I. Roduhskin ; A. Soldati ; C.N. Trueman ; H. Yua
• 关键词：Chemical composition ; Biogenic phosphate ; Reference material ; Fossil bone/tooth
• 刊名：Analytica Chimica Acta
• 出版年：2007
• 期刊代码：2_00032670
• 类别：ch
• 出版时间：19 September 2007
• 卷：599
• 期：2
• 页码：177-190
• 文件大小：681 K

摘要

Ten international laboratories participated in an inter-laboratory comparison of a fossil bone composite with the objective of producing a matrix and structure-matched reference material for studies of the bio-mineralization of ancient fossil bone. We report the major and trace element compositions of the fossil bone composite, using in-situ method as well as various wet chemical digestion techniques.

For major element concentrations, the intra-laboratory analytical precision (%RSD_r) ranges from 7 to 18%, with higher percentages for Ti and K. The%RSD_r are smaller than the inter-laboratory analytical precision (%RSD_R; <15–30%). Trace element concentrations vary by 5 orders of magnitude (0.1 mg kg⁻¹ for Th to 10,000 mg kg⁻¹ for Ba). The intra-laboratory analytical precision%RSD_r varies between 8 and 45%. The reproducibility values (%RSD_R) range from 13 to <50%, although extreme value >100%was found for the high field strength elements (Hf, Th, Zr, Nb). The rare earth element (REE) concentrations, which vary over 3 orders of magnitude, have%RSD_r and%RSD_R values at 8–15%and 20–32%, respectively. However, the REE patterns (which are very important for paleo-environmental, taphonomic and paleo-oceanographic analyses) are much more consistent.

These data suggest that the complex and unpredictable nature of the mineralogical and chemical composition of fossil bone makes it difficult to set-up and calibrate analytical instruments using conventional standards, and may result in non-spectral matrix effects. We propose an analytical protocol that can be employed in future inter-laboratory studies to produce a certified fossil bone geochemical standard.