FIELD: analytical chemistry. SUBSTANCE: determination involves the separation of analysates by thin-layer chromatography method on silica gel with inorganic binder silica sol at concentration 0.30-0.35 wt.-% impregnated with ammonium sulfate and catalyst copper formate at concentration 0.5-4.8 wt. -% followed by development at 190-200 C. Method ensures to improve the quality of thin-layer plates, soft conditions and simplify analysis process. EFFECT: improved method of analysis. 1 tbl
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