METHOD OF DETECTING IRON (II) Russian patent published in 2015 - IPC G01N31/22 

FIELD: chemistry.

SUBSTANCE: method of determining iron (II) includes preparing a sorbent and an iron (III, II) solution; adding hydroxylamine solution to reduce iron (III) to iron (II) and extracting iron (II) from the solution with the sorbent; converting the iron (II) into a complex compound on the surface of the sorbent; separating the sorbent from the solution; measuring the diffuse reflection factor of the iron (II) surface complex and determining content of iron using a calibration curve. The sorbent used is silica which is successively modified with polyhexamethylene guanidine and 3-(2-pyridyl)-5,6-di(2-furyl)-1,2,4-triazine-5',5"-disulphonic acid (Ferene S), and the diffuse reflection factor is measured at 600 nm.

EFFECT: low detection limit and wide range of determined iron content.

4 ex