Determination of sodium dodecylsulphate in aqueous solutions by amperometric methods
Abstract
Sodium salts of organosulfate ethers are the main representatives of anionic surfactants that are widely used in industry; sodium dodecyl sulfate belongs to these salts. This substance is mainly used in various branches of the chemical industry: pharmaceutical, chemical, cosmetic and some others. Due to its prevalence, it is important to have reliable express methods for identifying and monitoring its content in various environments. One of the methods can be implemented based on the amperometric method using sensors modified with polymers with a molecular imprint of sodium dodecyl sulfate. It is known that polyimides are of the greatest interest among selective materials, as a result of which these MIPs were developed based on a copolymer of 1,2,4,5-benzenetracarboxylic acid dianhydride and 4,4'-diaminodiphenyl oxide. In the course of the work, the metrological characteristics of the obtained sensors based on the analyzed surfactant were experimentally determined. The substance in aqueous solutions was determined using the calibration graph method. The range of determined concentrations of sodium dodecyl sulfate was 0.5-0.03 g/dm3 and the detection limit is 0.015 g/dm3. The development of the method for determining sodium dodecyl sulfate was carried out on model solutions prepared by the method of successive dilution. The correctness of the determination was verified by the "added - found" method. The experimentally obtained data indicate the ability of the amperometric sensor to determine the analyzed substance. The value of the relative standard deviation of the conducted comparative experiments of sodium dodecyl sulfate concentrations in the prepared model solutions and determined using the MIP sensor based on the sodium dodecyl sulfate imprint slightly exceeds 10%. The use of the proposed method provides a fast and simple way to assess the content of surfactant in aqueous solutions, which makes it promising for use in analytical chemistry and quality control of aqueous solutions.
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References
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