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A Simple Approach for the Selective and Sensitive Colorimetric Detection of Anionic Surfactants in Water


  • We thank the Ministerio de Ciencia y Tecnología (projects MAT2003-08568-C03 and CTQ2006-15456-C04-01/BQU) and Generalitat Valenciana (project GV06/101) for support. C.C. thanks the Universidad Politécnica de Valencia for a doctoral fellowship. F.S. also thanks the Ministerio de Educación y Ciencia for a Ramón y Cajal contract.


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Good color sense: A sensing material (S1) containing imidazolium-anchored binding groups is used with a suitable dye (methylene blue) in a simple two-step protocol for the colorimetric detection of anionic surfactants in water (see picture). A detection limit of 1 ppm can be achieved, and the method is free from the use of hazardous solvents.

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