Analytical possibilities of apparent content curves for ternary system
s are studied. The mathematical method proposed is applied to UV-Vis s
pectrophotometric and fluorimetric techniques. Samples containing fluo
resceine/eosine/acridine and methyl red/methyl orange/cresol red are r
esolved by fluorimetry and UV-spectroscopy, respectively. Results obta
ined are in agreement with the theoretical contents in both cases.