Physico-chemical studies on the binding of dyes with surfactants: II. Polarography of surfactant-dye mixtures

✍ Scribed by Wahid U. Malik; Puran Chand

• Publisher: Elsevier Science
• Year: 1969
• Weight: 279 KB
• Volume: 22
• Category: Article
• ISSN: 0022-0728
• DOI: 10.1016/s0022-0728(69)80147-6

✦ Synopsis

Recently, Buchanan and Griffith 1 have made a brief investigation of the applicability of the polarographic method to the estimation of anionic surfactants. This method (with slight modifications) can be used not only for estimating the surfactant concentration but also for determining quantitatively the binding of the dyes to the surfactant. The present communication describes the polarographic investigation of the binding of acidic dyes to cationic surfactants and basic dyes to anionic surfactants and is an extension of our earlier spectrophotometric study 2.

EXPERIMENTAL

Reagents

Dioctyl sodium sulphosuccinate (Manoxol OT), cetyltrimethylammonium bromide (CTMAB) and cetylpyridinium bromide (CPB) were all BDH products and were used without further purification.

Methylene blue, congo red and alizarin red S were BDH products and were purified by further recrystaUization.

Buffers (Robinson-Britton, glycine and acetate) were prepared in doublydistilled water by the usual method 3. The pH was checked with a Beckman pH-meter, model H.

Apparatus

Polarographic measurements were carried out using a Heyrovsk3~ polarograph, model Lp 55A operated manually using a Scalamp Pye galvanometer. All measurements were made at 25 +_ 0.1 ° by immersing the H-cell in a thermostatic water bath. Purified hydrogen was used to maintain an inert atmosphere.