METHOD OF DETERMINING SELENIUM(IV) Russian patent published in 2015 - IPC G01N31/22 

FIELD: chemistry.

SUBSTANCE: methods of determining selenium (IV) using a polymethacrylate matrix includes preparing a selenium (IV) solution, extracting selenium (IV) with a membrane with immobilised dithizone or extracting triiodide ions with a membrane for indirect determination of selenium (IV), followed by separation from the solution, measuring an analytical signal and estimating content of selenium (IV). When using a polymethacrylate matrix with immobilised dithizone, the analytical signal light absorption at 610 nm is used; when extracting triiodide ions with a membrane for indirect determination of selenium (IV), the analytical signal used is light absorption at 370 mm, or visual estimation of the colour intensity of the optical membrane is used; content of selenium (IV) is estimated from a calibration curve or using a visual test method.

EFFECT: methods are simple, sensitive and environmentally safe.

2 cl, 3 dwg, 3 ex, 2 tbl