Collaborative Analysis Programme for the Characterisation of New USGS Microbeam Reference Materials
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122 Collaborative Analysis Programme for the Characterisation of New USGS Microbeam Reference Materials Three new candidate reference materials are now available for distribution to geochemical laboratories willing to contribute analytical data from microbeam techniques. The basalt glasses were made from aliquots (2 kg) of USGS reference materials BIR-1, BCR-2, and BHVO-2, which were melted at 1500° C and then cooled rapidly. The three glasses have element compositions similar to their powdered precursors, except for ferrous iron which is significantly less. Information on the composition of BIR-1, BCR-2, and BHVO-2 is available on the USGS web page (http://minerals.cr.usgs.gov/geo_chem_stand/ ). The analytical protocol calls for participating laboratories to receive three fragments of each basalt glass requested. Each fragment is to be analysed in triplicate (minimum requirement) and all analytical results are to be forwarded to the USGS. The black, irregularly shaped fragments range in size from 1 mm 3 to 1 cm 3 . Please indicate the microbeam procedure to be used, and the size of fragment required. Additional fragments may be requested, but the availability of larger fragments (> 0.5 cm 3 ) is limited. Stephen Wilson U.S. Geological Survey PO Box 25046, MS 973 Denver, CO 80225 USA Tel: (1) 303-236-2454 FAX: (1) 303-236-3200 e-mail: [email protected] These samples are now available by contacting: Call for participation Characterisation of basalt glass reference materials BIR-1G, BCR-2G, and BHVO-2G GEOSTANDARDS NEWSLETTER The Journal of Geostandards and Geoanalysis
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Transcript of Collaborative Analysis Programme for the Characterisation of New USGS Microbeam Reference Materials
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Collaborative Analysis Programme for the Characterisationof New USGS Microbeam Reference Materials
Three new candidate reference materials are now available for distribution to geochemicallaboratories willing to contribute analytical data from microbeam techniques. The basalt glasseswere made from aliquots (2 kg) of USGS reference materials BIR-1, BCR-2, and BHVO-2, whichwere melted at 1500° C and then cooled rapidly. The three glasses have element compositionssimilar to their powdered precursors, except for ferrous iron which is significantly less. Informationon the composit ion of BIR-1, BCR-2, and BHVO-2 is available on the USGS web page(http://minerals.cr.usgs.gov/geo_chem_stand/ ). The analytical protocol calls for participatinglaboratories to receive three fragments of each basalt glass requested. Each fragment is to beanalysed in triplicate (minimum requirement) and all analytical results are to be forwarded tothe USGS. The black, irregularly shaped fragments range in size from 1 mm3 to 1 cm3. Pleaseindicate the microbeam procedure to be used, and the size of fragment required. Additionalfragments may be requested, but the availability of larger fragments (> 0.5 cm3) is limited.
Stephen WilsonU.S. Geological SurveyPO Box 25046, MS 973Denver, CO 80225USA
Tel: (1) 303-236-2454FAX: (1) 303-236-3200e-mail: [email protected]
These samples are now available by contacting:
Call for participation
Characterisation of basalt glass reference materials BIR-1G, BCR-2G, and BHVO-2G
GEOSTANDARDSNEWSLETTERThe Journal of Geostandards and Geoanalysis
