Stable silicon isotope analysis on nanomole quantities using MC-ICP-MS with a hexapole gas-collision cell

作者：Sun Xiaole^*; Andersson Per; Land Magnus; Humborg Christoph; Morth Carl Magnus

来源：Journal of Analytical Atomic Spectrometry, 2010, 25(2): 156-162.

DOI：10.1039/b911113a

We demonstrate in this study that a single focusing multiple collector inductively coupled plasma mass spectrometer (MC-ICP-MS) equipped with a hexapole gas-collision cell (GV-instrument (R) Isoprobe) can precisely determine the delta(29)Si (2S. D., 0.2 parts per thousand) using a total Si consumption of less than 14 nmole (390 ng Si). Testing and evaluation of background, rinse time, and major matrix effects have been performed in a systematic way to establish a procedure to measure delta(29)Si in small quantities. Chemical purification prior to analysis is required to remove potential interferences. For data collected during a four-year period, the average delta(29)Si value of IRMM-018 relative to NBS-28 was found to be -0.95& (n = 23, 2S.D. 0.16 parts per thousand) with a 95% confidence interval (-0.95 +/- 0.028 parts per thousand). The mean d29Si value of the Big-Batch standard was found to be -5.50 parts per thousand (n = 6, 2S.D. 0.26 parts per thousand). Although determination of the delta(30)Si measurements is not possible, with our current instrument we demonstrate that this system provides a fast and long-term reliable method for the analysis of delta(29)Si in purified samples with low Si concentration (18 mu M Si).

• 出版日期2010