Solvent extraction-spectrophotometric determination of anionic surfactants with ethyl violet

Abstract

Several cationic dyes were evaluated as reagents for the spectrophotometrlc determination of anionic surfactants. Of the dyes examined, ethyl violet was the most useful reagent. By use of this dye, trace amounts of anionic surfactants could be extracted Into benzene and toluene In a single extraction and determined spectrophotometrlcally at 615 nm; the molar absorptivity was about 1 X 10s L mol-1 cm-1 and the absorbance of the reagent blank was 0.01. The method could be applied to the determination of parts-per-bllllon amounts of anionic surfactants In waters with satisfactory results.

Removal of surfactant from industrial wastewaters by coagulation flocculation process

“…for wastewater characterisation measurement are performed according to Standard Methods (AFNOR, 1999). Surfactants: detergent compounds are determined using solvent extraction-spectrophotometric with Ethyl Violet method (Motomizu, et al, 1982).…”

Ion-Association Reagents A Review

“…The number counter ions of (8) and (9) are mostly in parenthesis sulfate anion corresponds to the and that of (11) is the right side nitrogen, but the charge can exist on the left side and the sulfur atom can also show the positive charge. So the positive charge of Methylene Blue (1) is distributed over the whole ion.…”

“…Among the sphere type reagents, tetraphenylarsonium (7) and tetraphenylborate (10) are colorless, while Cu(I) neocuproine chelate cation (8) and Fe(II) 4-chloro-2-nitrosophenol chelate anion (11) are colored. If the colored chelate ion and an oppositely charged ion-association reagent have the same Amax (wavelength at maximum absorption), the sensitivity of the extraction-spectrophotometry will be greatly increased.…”

“…Thus, metachromasy is a specific phenomenon between ion-associable dyes and counter-charged ion-associable colorless ions. 8 Metachromasy…”

Spectrophotometry Determination of Anionic Surfactants in River Water with Cationic Azo Dye by Solvent Extraction-Flow Injection Analysis

“…Recently, Higuchi et al 3 have developed a cationic dye more extractable than Methylene Blue. Motomizu et al 4 have also developed a solvent extraction-spectrophotometric method for anionic surfactants with Ethyl Violet: the method needs only a single extraction, and the its molar absorptivity of ion associate is about 1X1051 mol-' cm'.…”