PHOTOMETRIC METHOD OF DETECTING IRON (III) IN PURE SALT SOLUTIONS Russian patent published in 2008 - IPC G01N31/22 G01N21/78 

FIELD: chemistry.

SUBSTANCE: present invention pertains to analytical chemistry and can be used for determining small concentrations of iron (III) in pure salt solutions. The method involves converting iron (III) to a coloured complex compound with ammonium thiocyanate in a weakly acidic medium. 2 ml of a buffer solution with pH 4.8-5.5, 0.23-0.40 ml of a 0.2% solution of a surface active substance, obtained from diluting a 2% Tween-80 solution with water, 0.6-1.0 ml of a 10^-2 M solution of ammonium thiocyanate, 0.15-0.25 ml of a 10^-3 M ammonium solution and up to 10 ml of water are added to the analysed iron (III) solution, with subsequent heating in a water bath at 80-98°C for 4-6 minutes.

EFFECT: increased sensitivity of analysis.

1 ex, 3 dwg