100 ng or less amount of boron in the form of Na2B4O7 was loaded on tantalum filament of thermal ionization mass spectrometer. A serial isotope ratios of metaborate, Me=88 (Na2 11BO2) and Me=89 (Na2 11BO2) prepared with spike (10B enriched) and nature boron were determined successfully and compared with reference values.
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