Document byBZ1xLnGZdJJnLOZD5mKVNY1

August 7th,. 1967 Director \ Industrial Hygiene Foundation Mellon Institute 4400 Fifth Avenue . Pittsburgh 13 Pennsylvania, U. S. A. Dear Sir: As students of the School of Pharmaceutical Chemis-- try, we are interested in getting some information about the determination of Dead in blood by the Pithizone method. We ma.de several analysis by this method in samples from foundry and battery workers. Our technique was that described in the book "Standard methods of Chemical Analysis" by N,Howell Fur man, Yol. IIB, Pgs. 214O-2142, 1963. The results of this me thod are given in mierograms of Lead per 100 milliliter of blood, but the values for normal and abnormal absorption are given in micrograms of Lead per 100 grams of blood. For this reason, we can not compare our results'with the standards - established by Occupational H e M t h Institutions The Occupa tional Health Division of the Colombian Ministry of Public Health ;gave us the following values: . . 0.000 - 0.039 Microgr of.Lead/ICO gr of Blood far normal non-occupational absorption. 0.040 - 0 .069 (idem units) for normal Occupational absorption. ." 0.070 -- 0.079 for dangerous occupational absorption. - 0.080 -- and higher for o ccupstional absorption com-- . patible with Deed intoxication. Our question is: flan our results by volume be compa red with.the above values by weight without a significant di fference? or Does your Institute have knowledge about the a- -1 bove-Table in Microgrems of Lead per 100 ml. of Blood? ` Your information can be sent to the following : address:. . .1 - ` :. Facultad deQumica'/Farmacutica Universidad de Antioquia i\ ' ... Medellin, Colombia. h /' ' . . , . , South Amrica ./ v i V : . . ' ' . ' ' . . ., We wish to thank :in advance, your attention to our letter. ' . < . - . . . , -" - . ' . Very truly yours,' ' gp . ' ' . Francisco Mejia ..