Boron Mass Fractions And Delta B-11 Values Of Eighteen International Geological Reference Materials

Here we report boron (B) mass fractions and delta B-11 values of a set of geological reference materials including ultramafic rocks, basalts, andesites, felsic rocks and sedimentary materials. Boron was purified using a single column loaded with AGMP-1 resin. The delta B-11 data were determined by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) using the sample-standard bracketing method, and the NIST SRM 951 reference solution was selected as the calibrator. Boron mass fractions were measured by ICP-MS. Based on analyses of the NIST SRM 951 reference solution over a period of 1 year, the intermediate measurement precision for B isotope determinations was better than 0.5 parts per thousand (2s). The robustness of the overall B isotope analytical procedure was evaluated by carrying out replicate analyses of five reference materials (i.e., B5, JB-2, JB-3, B6 and JR-2). The eighteen geological reference materials have delta B-11 values ranging from -28.85 to +10.47 parts per thousand and B mass fractions ranging from 2.37 to 158 mu g g(-1). The comprehensive data set presented here serves as a reference for quality assurance and comparison of B isotope and B mass fraction data among different laboratories.