Abstract
The neurotoxic tricresyl phosphates (TCP) are odorless, colorless and stable compounds. The o-isomer of TCP is more toxic than the m- or p-isomers (1,2) and tri-ortho-cresyl phosphate (TOCP) is now a reference chemical for experimental organophosphorus induced delayed neurotoxicity (OPIDN), although it is not an organophosphorus pesticide (3). TCP mixtures (o, m- and p-isomers) are still used as plasticizers and flame-retardants in a variety of industrial and commercial preparations (primarily paints, lubricants, plastic, and hydraulic fluids).