SOLVENT POLARITY INDICATORS - EXTRACTION OF SOME COUMARIN INDICATOR DYES

Study of the extraction of ten different coumarins (unsubstituted, 6-m ethyl-, 7-methyl-, 4-hydroxy-, 7-hydroxy-, 7-hydroxy-4-methyl-, 7-meth oxy-, 7-amino-4-methyl-, 7-diethyl-amino-4-methyl-, and 3-carboxy-) wi th nine organic solvents shows that the percentage extraction is gener ally high. Cyclohexanone and heptane were found to be, respectively, t he most and least effective extracting solvents for the compounds unde r study. The results are discussed in terms of the effect of different solvent polarity parameters on the extraction process.