METHOD OF SEPARATING AND DETERMINING IRON (III) AND IRON (II) Russian patent published in 2015 - IPC G01N31/22 

FIELD: chemistry.

SUBSTANCE: method includes preparing a solution containing iron (III) and iron (II), creating the necessary pH, reacting the solution with a sorbent, measuring the diffuse reflection factor at 500 nm and determining iron content from a calibration curve, where in order to separate iron from the solution in different oxidation states, the sorbent used is silica which is successively modified with polyhexamethylene guanidine and pyrocatechol-3,5-disulphonic acid, wherein iron (III) is separated from the solution with pH=3, and then iron (II) from the solution with pH=6.

EFFECT: high information value and reliability of analysis.

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