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Abstract
Scintillation emission spectral analysis (SESA) provides information on the number and on the size of solid particles containing the chemical elements being determined. Recently, the SESA apparatus used in our investigations was automated, resulting in increased productivity. Semiquantitative SESA is carried out simultaneously for three chemical elements, and is able to class particles according to their sizes into 2 to 5 groups, the smallest being 2 to 4 μm. SESA is suitable for analyzing various types of geochemical samples including rocks, ores, soils, plant ash and unashed phytolithic matter. High sensitivity (3–30 ppb) and productivity (100–200 samples per day per analyst) make SESA a method of choice for mass analysis of gold and platinum group elements (PGE). During the past 16 years, more than 100 000 samples have been analyzed for gold and close to 50 000 for the PGEs. The paper discusses SESA of gold in ashed biogeochemical samples, and the analysis of all six PGEs in biogeochemical and lithogeochemical samples. The influence of Pb on Ir determinations in plant ash is also discussed.
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