SOLUBILITIES AND SURFACE ACTIVITIES OF PHTHALATES INVESTIGATED BY SURFACE TENSION MEASUREMENTS

摘要

Aqueous solutions of DEP(di-ethyl), DnBP(di-n-butyl), DnH(6)P(di-hexyl),and DEHP(de-［2-ethyl-hexyl］)phthalates have been investigated by use of surface tension measurements at temperatures between 10 and 35 deg. C. A tensiometric approach allows for the determination of unimeric solubilities and ΔG°, which is the standard Gibbs free energy change, for the dissolution of phthalates in water. The unimeric solubility of the phthalates increase with decreasing temperatures. The ΔG°shows a linear increase with increasing phthalate alkyl chain length.