High-precision trace element data for the USGS reference materials BCR-1, BCR-2, BHVO-1, BHVO-2, AGV-1, AGV-2, DTS-1, DTS-2, GSP-1 and GSP-2 by ID-TIMS and MIC-SSMS

Different batches of the new US Geological Survey (USGS) reference material s (RMs) BCR-2, BHVO-2, AGV-2, DTS-2 and GSP-2 and the original USGS RMs BCR -1, BHVO-1, AGV-1, DTS-1 and GSP-1 have been analysed by isotope dilution u sing thermal ionisation mass spectrometry (ID-TIMS) and by multi-ion counti ng spark source mass spectrometry (MIC-SSMS). The concentrations of K, Rb, Sr, Ba and the rare earth elements were determined with overall analytical uncertainties of better than 1% (ID-TIMS) and 3% (MIC-SSMS). The analyses o f different aliquots; and batches of BCR-2, BHVO-2, AGV-2 and GSP-2, respec tively, agree within 1%, i.e. approximately the analytical uncertainties of the data. This indicates an homogeneous distribution of the trace elements in these RMs. Differences in element concentrations of up to 17% in differ ent aliquots; of the depleted RM DTS-2 are outside the analytical uncertain ty of our data. They may be attributed to a slightly heterogeneous distribu tion of trace elements in this dunite sample. Our trace element data for BC R-2, BHVO-2, AGV-2 and GSP-2 agree within about 3% with preliminary referen ce values published by the USGS. They also agree within 1-6% with those of the original RMs BCR-1, BHVO-1, AGV-1 and GSP-1. Large compositional differ ences are found between DTS-2 and DTS-1, where the concentrations of K. Rb, Sr and the light REE differ by factors of 2 to 24.