Document 3e9bn6Bn0GLKONdaDKwe5JZqO

(' U.A. Lidjolt - Kuabon 24th December, 1969 r.C.P, ,\H\hVilS lLUl/uDlt E.S. TUCTia - St. JjQuis t r" tl. \. liaxtor, tuiubon : I'.,.,. holler, bt, uoule'i 11.A. Yuiulan, uuUmiu V.K. Uiclmrii, St. Louis Thanh you for your memo on the use of b.C.O.T, colunns for p.c.b. analysis. The clirorwto. rams will be very useful to us In tlio biodc'Tiirtutiou study slues we are now concerned with identifying specific isomers in 1.'.'42 to determine which are the most easily degradod. four il.C.O.T. cliromotogrons give the highest resolution for 11142 that I buvo soon Tor low levels, and we ehull shortly be trying to duplicate' the;... Our iiiLtial results on a well used 50' silicone gum LL30 S.C.O.T. were not successful - this may hnrvc been due to age or contamination, but wo have now built on oil gloss ays too (p.L.O.T, columns} and will try again, I bnvo notlood tlmt tliare is little evidence for 11142 In cltroraotopriuus obtained in the U.lv. on extracts from wildlife residues otc,, possibly because it is degraded and most people are quoting the p.c.b.*s found as 1254 and occasionally 126(1. Do you rind a similar situation in tlio li.S.? 11.A. LlDtt.JTT ' HONS 099179 MONSFOXOOQ99147 WATER PCB-SD0000055010