CATALYTIC KINETIC SPECTROPHOTOMETRIC DETERMINATION OF SODIUM DODECYL SULPHONATE

A novel catalytic kinetic spectrophotometric method for the determination of trace sodium dodecyl sulphonate (SDS) is proposed using the principle that trace SDS catalyses the oxidation fading reaction of rhodamine B by potassium periodate. Under the optimum reaction conditions, a good linear relationship is presented between the reaction rate and the mass concentration of SDS over the range of 0.30–1.0 μg/mL at its maximum absorption wavelength of 552 nm. The detection limit of the method was 0.152 μg/mL. The method has been successfully used to determine SDS in scour and water samples.