FIELD: chemical analysis. SUBSTANCE: starting solid material is worked with solvent. Composition of solvent or its temperature is changed. Increase of temperature and change of composition of solvent are conducted either by increase of rate and degree of change of temperature and/or composition of solvent with proviso that process of dissolution of phases is slowed down or stopped or by decrease of rate and degree of change of temperature and/or composition of solvent. In this case process of dissolution of at least one element out of mix of analysed substance goes on with significant rate. EFFECT: improved authenticity of phase analysis. 3 cl, 1 tbl
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