FIELD: agriculture. SUBSTANCE: to perform the mineralization of material weight portions one should use the mixture of sulfuric and nitric acids at the ratio of 1 : 0.8 0.4 at heating (boiling). Moreover, nitric acid is added in 2 stages per 0,5 against total quantity of the suggested mixture. EFFECT: higher efficiency to decrease the expenses of oxidizing mixture, higher economy and reliability of analysis. 2 ex
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