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A colorimetric displacement assay system for F − and H 2 PO 4− anions based on a 2,6-dichlorophenol-indo-o-cresol sodium salt:calix[4]arene-p-sulfonate complex was studied in 1:1 DMSO:water solution. When calix[4]arene-p-sulfonate formed the complex with the blue 2,6-dichlorophenol-indo-o-cresol sodium salt dye, the absorption peak of the dye at 625 nm disappeared and...
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