Flow injection spectrophotometric determination of anionic surfactants using methyl orange as chromogenic reagent.

  • Q. He, H. Chen
  • Published 2000 in Fresenius' journal of analytical chemistry


A flow injection(FI) spectrophotometric method for the determination of anionic surfactants was developed on the basis of the competition for the cationic surfactant cetyl pyridine (CP+) chloride between the acidic dye methyl orange (MO) and anionic surfactants. In a pH 5.0 medium the cation of cetyl pyridine (CP+) reacts with dissociated methyl orange (MO… (More)


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