METHOD OF DETERMINING CONTENT OF MAGNETITE AND MAGHEMITE IN SOIL Russian patent published in 2009 - IPC G01N33/24 

FIELD: chemistry.

SUBSTANCE: method involves parallel treatment of soil with Tamm's reagent with determination of iron content (Fe₂O₃)_ox and Mehra-Jackson reagent with determination of iron content (Fe₂O₃)_dit. Specific magnetic susceptibility χ of the soil before and after treatment with the reagents is also determined. Specific magnetic susceptibility of extracted iron compounds is also calculated. The content of strong magnetic oxides of iron, magnetite and maghemite is calculated first in air extracts using equation Fe₂O_3(magn-magh)=[χFe₂O_3(exth)-70·10^-8]:39930·10^-8,, and then in the soil using equations C_magn=(Fe₂O_3(magn)·Fe₂O_3(ox)):100 and C_magh=(Fe₂O₃(_magh)·Fe₂O_3(dit)):100.

EFFECT: method allows for determining content of soluble strong magnetic oxides of iron, magnetite and maghemite in soils for evaluation of oxidation-reduction state of soil and degree of hydromorphism.

1 dwg, 1 tbl, 1 ex