Untitled

Lanthanide-Containing Liquid Crystals and Surfactants

“…Complexometric reagents other than xylenol orange have been investigated, too. [266][267][268] Micellar ultrafiltration has been used to determine the extraction yield of europium(III) by a series of micelle-solubilized extractants derived from 5-pyrazolone as a function of the pH. 269 The extractants were solubilized inside CTAB micelles.…”

Chemical chromaticity: potential of the method, application areas and future prospects

“…Studies of the properties of organic reagents are important for expanding the analytical capabilities of chromaticity. 34 In view of this, the optical and chromaticity characteristics of Arsenazo III in solution and in the adsorbed state on an AV-17 anion-exchange resin have been studied. The chromaticity functions (CF) of Arsenazo III, namely the chromaticity coordinates x, y, z in the XYZ system, lightness (L), chromaticity coordinates A, B in the CIELAB system, colour saturation (S ), yellowness (G ), hue (T ), as well as colour differences with respect to saturation (DS ), lightness (DL) and tint (DT ), were measured relative to a white colour standard with a diffuse reflection coefficient R equal to 0.98.…”

“…Sorption of two-and multicharged ions is hampered or impossible due to steric hindrance. Ivanov et al 34 suggested the use of molar CF coefficients (the ratio of the signal of a given CF to the concentration of the complexing agent expressed in mol litre 71 ) which increase in the series: R < G < B < L, X < S, A < W < DE < Z < Y. It was also found that the molar CF coefficients are 1.5 ± 2.5 orders higher than the molar absorption coefficients (e).…”