Abstract
We studied the effect of chemically reactive additives of AlF3, ZnF2, and SrF2 on the character of boron evaporation from a crater in a DC arc electrode in the analysis of graphite. The introduction of fluorinating additives contributes to a rapid, complete, and stable evaporation of boron. Zinc fluoride is the most effective among the studied compounds. The use of this additive made it possible to lower the limits of quantification of boron in graphite to 5 × 10–6 wt % and to double the reproducibility of the results. The use of zinc fluoride also eliminated the systematic error due to the difference in the evaporation patterns of boron oxide and carbide, which improved the reliability of the determination results.
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