Qualitative determination of ferrocyanide ion with quinone chloroimide

A new reagent for detection of ferrocyanide ion.

“…This reagent gives with ferrocyanide ion in neutral or slightly acidic medium, colorless crystals which are prisms when observed under a low power microscope. Under the present experimental conditions, this reaction may be considered relatively characteristic in comparison with most of its analogs reported in the literature, because no interference has been found from: (1) nitrogen-containing ions (CN~, SCN-, and Fe(CN)6-3); (2) strong oxidizing agents (Cr04=, Cr207% As04-3, C103~); and (3) other oxyions (NOa" NO-r, SOr, SOr, S203= As02-PO4-3, C03=, C204= BO*-, C4H406", C2H302") and S" EXPERIMENTAL Preparation of N-chlorosuccinimide. Suecinimide was prepared by the action of succinic acid on urea according to the procedure given by Ma and Sah (6).…”

“…In addition to the usual test for ferrocyanide ion by using uranyl acetate, ferric chloride (@)7 and titanium tetrachloride (8), a good number of organic reagents has been proposed (3)(4)(5)(6)(7)(8)(9)(10). Recently Blank (1) suggested the alcoholic solution of quinone chloroimide for the detection of ferrocyanide ion. This reagent has, however, the drawback of becoming darkened on standing, and hence should be freshly prepared immediately prior to its use.…”