Document 8VM1OYGY8kkg0O0goMar5z0vK

tiER STAATLICHE GEWE RBE ARZ T fr den Aufsichtsbezirk Westfalen Hl. je m ` ^stehende s Aktenzeichen angeben) D er Staatliche Gewerbearzt, 463 Bochum. Marienplatz 2 n Bochum . den 7.12.1 Q70 Fernruf 60575 - 79 Postscheckkonto Dortmund 32799 Herrn Professor ' . B.A. Kenne Pep., of Occupational Medicine Hhiversity of 0inc Inaft i /USA. j Conc: Limit values for lead workers; Amsterdam-conference 1968 Lear Mr. Kehoe! We were much astonished at the recommendations made on the Amsterdam-conference in 1968, since at the same time well known specialists had published quite different limit values for leadworkers. Such limit, values were in the "Statement" (Brit. Med. J. 1968, 4, 501): ALA 20 mg/Liter CP , 500 yug/Liter On the Amsterdam-conference those values were reduced to ' the half without detectable motivation: ALA 10 mg/ Liter CP 300 yUg/Liter whereupon the public lead neurosis has been started in 1970 in Germany. The Amsterdam limit values for ALA and CP are scarcely more than upper normal limits for industrial workers without known lead exposition: r - Normals M + 2s M + 3s mg ALA/l 6,5 8 . yug CP/l 200 250 In this point the proposals of Amsterdam seem tojbe a. nonsense in occupational medicine, for two reasons: 1) All work with lead connected with some exposition in the manner of nowadays should be stopned, 2) lead up to 70 yug/100 ml blood was said to be acceptable in Amsterdam. But with lead levels within 50 - 70 yug/loo v ery often occure Ala ~ and CP-concentrations up to 20 mg/l and 800 yug/l respectively. That means, the Amsterdam relation between 70 yug Pb/100 ml blood and 10 mg ALA/l urine is not correct. (A reprint is added to see the relation ALA-CP). ' I would be grateful, if you would stand up for the reasonable " Statement ", you have signed, which contains limit values proved since many ^ears. The Statement agrees fairly well with the old german values, but the new ones lead to a complete confusion. Yours sincerely /f t -C Pi. i V. l^e f A i d i^ei V(ijMhi o