Boron Mass Fractions and <i>δ</i><sup>11</sup>B Values of Eighteen International Geological Reference Materials
Guanhong Zhu, Jinlong Ma, Gangjian Wei, Le Zhang
Abstract
Here we report boron (B) mass fractions and δ 11 B 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 δ 11 B 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‰ (2 s ). 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 δ 11 B values ranging from −28.85 to +10.47‰ and B mass fractions ranging from 2.37 to 158 μg 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.