Document G643JqmpXQDqwd4RRyDpxy2D7

cc: bcc Maroh 18, 1969 Professor Ounnar Widmark Institute of Analytical Chemistry University of Stockholm Roslagsvagen 90, Stockholm 59, Sweden ' Dear Professor Widmarki ," Perhaps you will recall that on the occasion of your visit to Monsanto In St. Louis in 1965, I had the pleasure of meeting you and participating in some of the discussions concerning analytical problems with the isomers of tricresyl phosphate. In February, 1967, you kindly sent our Mr. Oene Wilde the manuscript of e lecture Mr. Sorer. 'Jensen had presented describing analytical techniques tc identify interfering sub stances' in the widely used methods for determining chlorinated pesticide residues in wildlife and other specimens. In an article in the Journal of the A.O.A.C. (Vol. 50, Ho. 5, 1967), the first reference listed is "(l) Jensen and Widnark, Acta. Chem. Scand. in press". Our library has searched Acta. Chem. Scand., issues 1 to 10, 1967, and issues 1 to J, 1968 (our most recent copies) and has failed to find your article. Could you inform me if the article was published and. If so, provide me with a reprint? We have been asked recently for the details of your analytical techniques and, respecting your request that the copy of your lecture be considered confidential and for use only within Monsanto, we do not feel free to refer to the details contained therein* Perhaps you will also recall meeting our analytical chemist. Dr. Robert E. Keller at the time of your visit. Dr. Keller and his associates have been developing the capabllltle8 for determining polychlorinated biphenyls in the parts per billion range using the techniques described in your lecture. It is quite likely that one or more of us from St. Louis will visit Stockholm DSW 201083 STLCOPCB4052487 Professor Gunner Widmark 2- Karch 18, 1969 later this year and would certainly appreciate the opportunity of meeting with you and your associates for discussions cl the chlorinated hydrocarbon pesticide residue problem. Since your visit to St. Louis, X have had the pleasure of inviting Professor Lars Friberg and Magnus Piscator of the JCarolinska Instltutet to participate in the first Gordon Research Conference on Industrial Hygiene in 1966. If you should encounter either of these gentlemen, please extend my warm personal regards. Sincerely, Er W; c s Elmer P. Wheeler Manager, Environmental Health sw 201084 STLCOPCB4052488