Chloramine T with iodine: A new reagent to determine the iodine value of edible oils

Abstract

Chloramine T (N-chloro-p-toluenesulfonamide sodium salt) and iodine (2:1, w/w) in carbon tetrachloride and acetic acid (1:1, vol/vol), referred to as reagent (I) was found to be effective for the determination of Iodine value of edible oils. Reagent (I) reacted quantitatively with the double bonds of oils of known weight. The reagent left unreacted after 20-25 min was titrated against standard sodium thiosulfate solution (0.04 M) in presence of potassium iodide (10%, 5 mL). The difference in volume of sodium thiosulfate solution consumed by reagent (I) without and with oil was a basis to calculate the iodine value of oils used. The iodine values of different oils were also determined separately following the standard procedure of Wijs, and calculated iodine value was obtained from the gas chromatographic profile of fatty acids. The iodine value obtained by the new method was in agreement with the results of the standard methods. The results obtained indicate that the method could be a complementary or an alternative to the Wijs method.

A Novel Spectrophotometric Determination of Some Phenothiazines Involving Iodine monochloride from Chloramine‐T with Iodine

“…The redox behavior of phenothiazines with CAT in hydrochloric acid medium (pH 1.6) has been studied by kinetic spectrophotometric methods [68]. Recently, CAT, with iodine in acetic acid medium, was employed in our laboratory as an effective source of iodine monochloride to determine the iodine value of a variety of edible oils [69,70]. Iodine monochloride generated in situ by the action of potassium iodide (with potassium iodate under Andrew's condition) was found to be a basis for the determination of phenothiazines by titrimetric methods [71].…”

“…Iodine monochloride generated in situ by the action of potassium iodide (with potassium iodate under Andrew's condition) was found to be a basis for the determination of phenothiazines by titrimetric methods [71]. This prompted us to test the effectiveness of the reagent, CAT with iodine, a known system to produce ICl [69], in determining the phenothiazines by a novel spectrophotometric method. …”