Document KRZ2QDmmEzpgpjRBVOe2MvxbN

Vtonsarttoy 9 '* HAM ili ir n in i in *n I 10 / B.V.R* Hardy, London lZih January, 1967 Aroclor - bvhh/arv P.G Benignus, St Louis G,R* Buchanan, St Louie BS Cameron, Brussels Br. R. Barnet Kelly, St* Louis GR. Graham, Hew York R.A. Steenrod, St Louis B. Wood, Brussels J.A. Evans, London R.A* Baxter, Ruabon 'J M I : 6 1967. & On 2nd January 1967 Hr A Richardson of Shell Chemicals' Tunstall Laboratory, Sittingbourne, Kent talked with me over the telephone concerning the Swedish Press report relating to the identification of "Polychlorinated Biphenols" as trace contaminant in sea birds, fish etc, Richardson has been working for some years on the similar problem with insecticides such as BBT, which are known to have wide distribution in traoe quantities He had already found that the chlorine-oontaining residue contained substances more stable than BBT* and just as SSren Jensen reports he has obtained spectrographic evidence that these are very Bimilar if not identical with Aroclors. He has obtained samples of Aroolors 1242, 1294* 1262 and 9460 from us,* and would now like to have small samples of any chemically pure Aroclor constituents which we may be able to supply* Milligram quantities would suffice for his purpose Mr Richardson was quite sure that the compounds reported to be "polychlorinated biphenols" are really meant to be polychlorinated biphenyls and as support he has sent me a copy of the synopsis of a paper entitled "Pesticide Analysisi Presence of Polychlorinated Biphenyls at Residue Analysis of Biological Samples" by SOren Jensen and Gunner Vidmark (photocopy attached) *v, I discussed w i t h Richardson the soundness of Jenserfs claims, and was assured that his work and findings are sound Jensen is on the staff of the Institute of Analytical Chemistry, University of Stockholm A note on the staff and work of the Institute is attached. From this you will see that Jensen is wholly c o n o e m e d with the analysis of chlorinated pesticides and with the work of stations for routine analysis I would be glad if Br. Baxter and Br Buchanan would arrange to send me milligram samples of any pure Aroolor constituents that may be available at Ruabon and St louis respectively N. > NfcV 0 2 2 1 1 5 732170