FIELD: chemistry.
SUBSTANCE: soil extract is obtained using nitric acid or mixture thereof with hydrogen peroxide or hydrochloric acid in open or closed systems, followed by separation of the extract from the soil residue by filtering, settling and centrifuging, evaporating and roasting the extract and X-ray spectral analysis of the dry residue, where during evaporation, 1-3 cm3 of saturated oxalic acid is added to the extract.
EFFECT: eliminating danger for personnel due to release of poisonous smoke when removing sulphuric acid residue.
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