Document QMaJBaVXb3wyQpyyggXbNaBk7

i at er i al : B~D Va c u t a i n e r s So u r c e : St o c k a s s u p p l i e d b y Be c t o n - Di c k i n s o n Co mp a n y , Ru t h e r f o r d , Ne w J e r s e y Re q u i r e d : De t e r mi n a t i o n o f r a n g e o f l e a d c o n t a mi n a t i o n r e s u l t i n g f r o m t he us e of B- D t u b e s not ' u n d e r g o i n g s p e c i a l c l e a n i n g . Di s c u s s i o n : ' Of t h e l a s t s h i p me n t o f 2 5 0 , a t o t a l o f 1 3 5 we r e a n a l y z e d f o r l e a d b y t he u s u a l me t h o d . I n c l u d i n g r e s u l t s wh i c h we r e r e p o r t e d a t v a r i o u s t i me s p r e v i o u s t o t h i s r e p o r t , a t o t a l of 165 r e s u l t s we r e a v a i l a b l e f o r s t u d y . Th e r es ul t s hav e been ar r anged as a f r equenc y di s t r i but i on i n o r d e r t o i n d i c a t e mo r e c l e a r l y t he ma g n i t u d e s o f t h e l e a d c o n t a mi n a t i o n s a n d t he f r e q u e n c y o f t h e i r o c c u r r e n c e . I t i s obvi ous f r om t hi s s t udy t hat I t I s not saf e t o u s e t he t u b e s wh i c h a r e p r e p a r e d i n t he u s u a l c o mme r c i a l ma n n e r . Sp e c i a l c l e a n i n g t e c h n i q u e s wi l l h a v e ' t o b e e mp l o y e d I f c o n t a mi n a t i o n i s t o b e r e d u c e d t o a s a f e r a n g e . I f t h e c l e a n i n g i s c a r r i e d ou t wi t h c a r e f u l a t t e n t i o n t o t he e l i mi n a t i o n o f p o s s i b l e d u s t c o n t a mi n a t i o n a r i s i n g i n t he v a r i o u s p r o c e s s e s e mp l o y e d i n t he p l a n t , i t s h o u l d n o t b e d i f f i c u l t t o k e e p t he c o n t a mi n a t i o n c o n s i d e r a b l y b e l o w 0 . 5 mi c r o g r a m, as h a s b e e n d e mo n s t r a t e d b y r e s u l t s o b t a i n e d i n e a r l i e r s t u d i e s car r i ed on I n our l abor at or y. Re s u l t s Fr e q u e n c y Di s t r i b u t i o n o f L e a d Co n t a mi n a t i o n s Ki i c r ogr ams Pb No . Ni l 0 .1 0 .2 0. 3 0 .q 0 .6 0. 7 0 .8 0 .9 1. 0 1.2 1- 3 l.k 1- 5 1. 6 1. 7 1. 9 2.0 2.3 2.k 2.6 2. 9 281 i 3k y 33 1 0J 3 7 1 k 2 3 1 3 1 2 1 1 1 1 1 Ra n g e o f t o l e r a t e d c o n t a mi n a t i o n = 1 2 3 = rj\ \ .,b f s Co n t a mi n a t i o n not t ol er at ed _ = 1+.2. = 2 5 k % Tot al 16 5 165