Document oDovq1xy2NqJvJDgGNEyGEOo7

KJ National Agri cul u i ral C hemicals Association it:: r.titinc^iw list HriLlrMM iliCT. U.w. W A SH IN G TO N . b . C t 2COOS Tdephone: J6-I5C5 A rt* Cod* 202 February B, 1968 Dr. W. R. Richard Monsanto Chemical Company Organic Division St. Louis, Missouri Dear Dr. Richard: Dr. Jack Early i n d i c a t e d that in Monsanto y o u w e r e the individual most knowledgeable about polychlorinated biphenyls (PCS) and their p o s s i b l e occurrence as residues in b i o l o g i c a l materials. Oar interest in the matter here at NACA 5s solely as an Sntfr Faring f a c t o r in t h gas chromatograph analysis of chlorinated hydrocarbons. We are aware cf the publications on this subject by Jensen end Widmark of the Institute of Analytical Chemistry in Stockholm, and of Holmes, S i m o n s , and Tatton in London. I have conferred with Stickel, Reichel, and Stan Hall who were present at the OECD meeting in Scotland last September where the subject was discussed. We learned that spiked samples of chlorinated hydrocarbon pesticides and PCB's are being prepared in the OECD and aliquots shared with residue laboratories in 14 member nations to evaluate the respective skills in identifying the unknowns. If you can add to our information on where similar residue analyses of PCB in biological samples is being conducted it will be much appreciated. I admit to being perplexed on how it is possible for PCB residues to be present as frequently as* the European data suggests. Maybo a brochure on'all of the uses of PCB's would be helpful. 'v e //rijlCC^Sincerely yours. Do^ / \ nn ald ^ A. P Sn pAeM nMcA eMr f Consul tant / D A S : sun NEV 03109 780630