Document yrp8RE9XmGK30m3NxJMYbqejV

I N D U S T R I A L H Y G I E N E F O U N D A T I O N O F A M E R I C A , I N C. Mel l o n In s t it u t e, 4 4 0 0 Fif t h Av en u e Pit t s bu r g h , Pa . 15213 Se p t e m b e r 5, 1967 D r. Robert A. Keh oe 345 R e so r Aven ue Cin cin n ati, Ohio 45220 D ear Dr. Keh oe: At the Le ad Sym p osiu m apparen tly D r. Ron ald E. Lan e equ ilibrated 80 fig. of le a d p e r 100 m l. w ith 80 m g. p e r 100 g r a m s of w h ole b lood in applyin g th e th r esh o ld fo r safe occu p ation al ab sor p t io n in h is t ab le s. A .N ation al R e se a r c h Cou n cil R ep o r t , "St an d ar d V alu e s in Blood , " d ated Ju ly 1951 (Air F o r c e T ech n ical Rep or t No. 6039) giv e s v alu e s fo r blood lead in w eigh t/volu m e d er ived fr o m a gr av im e t r ic m eth od which a ssu m e s t h e sp e c i f i c g r a v i t y o f b lo o d t o b e 1. 056. I h av e r e c e i v e d t h e a t t a c h e d l e t t e r f r o m C o lo m b ia , Sou t h A m e r i c a ask in g if it w ould be p e r m issib le to t r a n sp o se w eigh t/volu m e to w eigh t/w eigh t. A s t h e C o lo m b ian r e gu lat io n a lr e a d y h as a 12. 5% sa fe t y m a r g in , i. e. , a t h r esh old of 70 m g. /100 gm . , it w ould ap p e ar th at a t r an sp o sit io n su ch a s is s u g g e s t e d w o u ld r a i s e t h e s a f e t y m a r g i n t o 18+%. T h i s c o u l d a d d a si g n i f i c a n t burden of w ork to the an alytical laboratory, u n n ecessar ily producin g an xiety fr o m the requ irem en t for repetition of an aly se s, and perh ap s lo ss of w ork and in co m e b y e m p lo y e e s. D o n lt y ou fe e l t h ey sh o u ld sw it ch to t h e w e igh t / w e igh t m eth od of reportin g? Best regard s. Sin cerely, C Robert T. P . d eTreville, M .D . M an agin g D irector d e T :sjc i ; AN A SSO C IA T IO N O F IN D U ST R IE S FO R T H E A D V A N CEM EN T O F H EA LT H FU L W O RKING CO N D ITIO N S