Abstract
The alternative use of lithium tetraborate and/or sodium tetraborate as flux constituents in the quantitative determination of platinum group elements (PGE) in standard reference materials SARM‐7, CHR‐Pt+ and CHR‐Bkg by graphite furnace atomic absorption spectrometry after preconcentration by nickel sulphide fire assay was reinvestigated. Results showed that lithium tetraborate has a lower recovery rate than sodium tetraborate, except for chromitites with PGE abundances in the ppm‐range. Best results for chromitites were obtained by using a mixture (1:1) of the two tetraborates. Examination of the NiS‐reguli by an electron microprobe revealed finer grain‐sizes of PGE‐phases for lithium tetraborate and coarser ones for sodium tetraborate, the finer grains being a possible reason for greater losses during analysis filtration.
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