An environmentally friendly multicommutated alternative to the reference method for anionic surfactant determination in water |
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Authors: | Ródenas-Torralba Eva Reis Boaventura F Morales-Rubio Angel de la Guardia Miguel |
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Institution: | a Centro de Energia Nuclear na Agricultura, Universidade de Sao Paulo, AvenidaCentenario 303, Piracicaba 13400-970, SP, Brazil b Department of Analytical Chemistry, Faculty of Chemistry, University of Valencia, Research Building, 50 Dr. Moliner St., 46100 Burjassot, Valencia, Spain |
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Abstract: | It has been developed a fully mechanized procedure for the spectrophotometric determination of anionic surfactants in water expressed in terms of SDS concentration. The reference method, based on the reaction of SDS with methylene blue (MB) followed by extraction in chloroform, was mechanized in order to reduce the consumption of organic solvents. The system was based on the multicommutation approach and provided a 35 times reduction of the waste production without sacrificing the figures of merit of the method in terms of sensitivity and repeatability, for a dynamic linear range from 0.2 to 1.7 mg l−1. Results obtained for washing water samples were comparable with those obtained using the reference method and no significant differences, at 95% confidence level, were observed. Other useful characteristics are a solvent consumption of 0.7 ml per determination, a sampling throughput of 40 determinations per hour, a relative standard deviation of 5.9% (n = 10) for a sample containing 2 × 10−6 mol l−1 (576 μg l−1) surfactant and a limit of detection of 6.1 × 10−9 mol l−1 (1.7 μg l−1). |
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Keywords: | Multicommutation Flow Spectrophotometry Surfactant Washing water |
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