Abstract
Fluorescent xanthenc dyes having carboxyl or hydroxyl group in their molecular structures were found to he dissociatively adsorbed on chrysotilc as carhoxylatc or phenolate. The dyes were preferentially adsorbed on chrysotilc more than on kaolinite because of the anionic adsorption. Fluorescence excitation and infrared spectra showed that deprotonated umbelliferone (7-hydroxycoumarin) was adsorbed on magnesium of chrysotile. Strong fluorescence intensities of these dyes adsorbed on chrysotile are expected to he utilized for a selective detection method of chrysotile asbestos.
