Journal of Analytical Methods in Chemistry / 2018 / Article / Fig 6

Research Article

High-Precision In Situ 87Sr/86Sr Analyses through Microsampling on Solid Samples: Applications to Earth and Life Sciences

Figure 6

(a) Reproducibility and accuracy for repeated measurements of 87Sr/86Sr on 12 ng load size of NSIT-SRM987 standard material for static versus dynamic collection mode over a period of 10 months. Each single measurement is plotted with the relative error bars. The grey-shaded field shows the [59] recommended value range. (b) Distribution of the 87Sr/86Sr values measured all over the period of analysis with the static and dynamic collection mode: the static collection mode (black filled columns) shows a worst external reproducibility than that obtained in the dynamic mode (open columns); indeed the dynamic mode gives measurements that reasonably fit a Gaussian distribution pattern with the more representative 87Sr/86Sr values centered within the [59] recommended interval (grey shade fields); (c) reproducibility and accuracy trend of 87Sr/86Sr 12 ng load size of NSIT-SRM987 measured in the dynamic collection mode throughout the setup period (from 2014 to 2016).

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