Document 7Oo7b8YamBGoGjVKn4aYEXQqj

JNSrnUTG OF ANALYTICAL tJUEMlSTIlY ,mnvMSirr of stocxkouj j g i r lYl>tn 99 EtodJjolm SO, Sweden Stockholm, "December 29* ;.1966^. Hr* Pord Koncnnto Chemical Co 600 Iiindbergh Hoed Sit Lenin, Kiaaoturl 63177 * USA < last year I had the great pleasure of viciting you at the Monsanto Co ' In St*ouie to dinouco analytical problems of the phenolic composition of SOP* We were later kindly supported with samples by Ur* J.S . Thomas and lir, A.J1, uelner. Our analytical investigations are almost finished eoid v/e v/ill send you a reprint of the report v/hen they will be availablo This letter is to Inform you that we recently have identified moot of the unknown CC-peaks at residue analysis of pesticides in biological samples# By the aid of combined GO and mass spectrometry *Xr* Jensen of l this Institute has found the unknowns to .be polychlorinated biphenyls which among otb.cr companies * arc manufactured" by Honorato9 trade name Aroclor Added to this letter you will find a preprint of the synopsis of our publication which will appear in Acta Chom* Scand* (Sumner 1967)* Two gas chromatograms aro alco added to chow that the chlorinated biphenyls are enriched In ecological scries* - In the eemplo of the sea eagle were foundt Polychlorinated biphenyls 60 ppm; ordinary chlorinated pcoticidQo 60 ppn end mercury" (.1) 40 ppm* * At present wo have no knowledge of the biological significance of the presence of these compounds in living organisms* V/e have' started a collaboration with the Bept. of Toxicology at the Carolin Institute but wo should Vrory much appreciate to work with your toxlcologisto over this problem* Vq will bo glad to give you any further lnformationo of tho results obtained* In this laboratory* Sincerely X ours 'y/wx* 4ttie& 77ia fc / Gunnar Widuark NEV 031064 r i 780602