Document YrdGrevBaO02bjQJGxZYw7QqO

11.A. Lidgett - unbon Fh Qu^>^e'/ 20th November, 1969 RAL/meb t<. Kichard, lit. Innis h.U. Keller 1/ " R.A. Baxter, tlunban U.A. Vodden, " K. 3C0TT-TUCHrai - Applied Sciences Group, St. Louis We ara at praaant attempting to axtond tbo uaa of copillary columns to tha ldantiflcotlon of p.e.b.'a present at loa lovela in samples of natural origin. Till a ia liting done alongside the work on tlie axoraination of poaaiblo biodegradation of 1212. '.Va feel Unit thero la a need for colunna capable of high raaolution in p.e.b, analyala aapaoially alien axtracta containing p.c.b.'a of unknown eoiapoaltion ara preaont. Tliia naad waa, I think evident in tha ehromatograM ahown to do by tha Laboratory of the Government Chemist where the Aroclor could lwva been tluit poatulatod (1260) or a partly dogrnded Aroclor of lower chlorine content. I ahould be grateful if you would lat mo know if you have dona any work on capillary oolumna and, if ao, any comoente on the feaalbility of their uaa at low p.e.b. levolo would bo wolcome (our evidence at preaoi.t la that below approximately 5` ng decomposition during pas chromatography may precludo uaa). MONS 097113