25--THE DETERMINATION OF PENTACHLOROPHENYL LAURATE IN TEXTILE AND PAPER MATERIALS.

Methods for the quantitative determination of pentachlorophenyl laurate (L.P.C.P.) in textile materials, described in British Standard 2087 and elsewhere, are reviewed, and it is demonstrated that a closer control of the quantities of added reagents is necessary. A modification in this respect to the existing British Standard method is proposed. A further modification is proposed whereby the existing 2-hr boiling with 4N aqueous sodium hydroxide is replaced by boiling for 30 min with an ethylene glycol solution of sodium hydroxide. This modification gives good recovery of L.P.C.P. for materials containing components such as wax or elastomers, for which low recovery had previously been obtained, and, in addition, considerably shortens the time of the determination. [ABSTRACT FROM AUTHOR]