Abstract
This paper presents details of an effective ion exchange method for extracting and purifying boron from aqueous fluids as well as modifications to the cesium metaborate mass spectrometric method for determining boron isotopic ratios. Using these methods, natural waters and brines may be routinely analyzed with precision and accuracy on the order of 0.25%. (2 σ), as indicated by analyses of standards and samples taken through the full separation procedure. We review and compare the essential methods used previously for boron isotopic analysis and discuss factors that adversely affect analytical precision and accuracy.
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