Abstract
Titanium in commercially available ammonium thiocyanate was determined by spectrophotometric method with diantipyryl methane after ion-exchange chromatographic separation. Samples, weighing 83 g each, were dissolved in 11 of water, and mixed with 91 ml of concentrated hydrochloric acid. The resultant solutions were passed through a column of Amberlite CG400 (5g of SCN- form) 5 times repeatedly. The total amount of sample was 415 g. Trace amount of titanium was adsorbed on the column, and then eluted quantitatively with 80 ml of 2 M hydrochloric acid-1.5 % hydrogen peroxide solution. The concentration of titanium in the eluent was determined spectrophotometrically with diantipyryl methane. Titanium in reagent grade of ammonium thiocyanate contained not less than 21.8 ppb.
