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Beryllium for isotopic analysis by accelerator mass spectrometry (AMS) can be extracted efficiently from geological materials using a procedure based on fusion with a mixture of KHF 2 and Na 2 SO 4 . In the presence of this flux, Be forms the fluoroberyllate anion (BeF 42− ), freely extractable into hot water, whereas Fe, Al, and Ti form highly insoluble fluorides...
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