It was fortified that mono-2-ethylhexyl 2-ethylhexyl phosphonate
HEH(EHP)
is monomeric in decanol by vapour pressure osmometry(VPO)method.Thetotal concentration of HEH(EHP)in the aqueous solution was determined bythe conductometric titration.The dissociation constant of HEH(EHP)in thewater-decanol system
the distribution constant and dissociation constant ofHEH(EHP)between the two phases were determined by two-phases titration.