Matrix independent and interference free <i>in situ</i> boron isotope analysis by laser ablation MC-ICP-MS/MS.

9b and d ): when the analyte is sampled with a laser beam area that is larger than that used to sample NIST SRM612, there is an increasing trend in the measured δ 11 B creating a positive isotopic mass bias; and when the analyte is sampled with a laser beam area that is smaller than that used to sample NIST SRM612, there is no clear bias and all measurements are within error of 0‰ mass bias (2 SE of ±0.6‰ or less).

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