Document aZXag0oX4voZxnD6oKq0MYXb

TO: George Williams - Blane TGG: JCL: ERT: M!H* mo- RF XF: --------------------- - Interoffice Communication FROM: DATE: SUBJ: T. G. Grumbles March 13, 1991 SKIN ABSORPTION HAZARDS FOR COOPER AND LEAD SOLUTIONS VISHA Attached is Dave Penney's assessment of the potential hazard of the copper and lead levels we are experiencing in the ribbon trays since the recycle project was implemented. The bottom line is that there is insignificant exposure based on his analysis. This analysis was based on levels of 350 pg/1 of copper and 1000 pg/1 of lead. He also assumed 10 hand and arm immersions per day. This may be low based on normal operator routines but this analysis was "worst case" in terms of absorption potential. Let me know if you have questions on the attached. c---- T. G. Grumbles dlj Attachment VVV 000006101 FROM: U i STA R8.D TO:U1STA MFG HOUSTON MAR 12, 1991 1:12PM B855 To: T. Grumbles From: D. Penney Date: March 12, 1991 Subject: Skin Absorption hazards for copper and lead solutions I do not anticipate any adverse consequences for Blane polymer workers exposed to ribbon tray solutions containing 350 ug/1 copper and 1000 ug/1 lead. The anticipated exposure to lead and copper is approximately 1.2% and 0.23%, respectively, of the estimated acceptable occupational levels of absorption of these materials. Further details of this assessment are given below. ABSORPTION ESTIMATES Assuming, both arms and hands are exposed at 10 sessions per day, no protection is worn, the skin is not washed off, a dailyabsorption of approximately 0.004 mg lead and 0.0014 mg copper is estimated {see attached). ACCEPTABLE OCCUPATIONAL DERMAL ABSORPTION LEVELS The estimated acceptable occupational dermal absorption levels of lead and copper, based on permissible inhalation exposure levels, are 0.03 and 0.6 mg per day, respeetively(see attached). This amounts to a daily lead and copper absorption which is 1.2% and 0.23% percent, respectively, of the estimated daily acceptable occupational absorption of these metals. Obviously, any unnecessary exposure to heavy metals should be avoided. Hearing gloves and washing after exposures provides an additional safety factor and is recommended. CC: J, Kirkpatrick J, Roheim VVV 000006102 FROM'. U l STA R&D TO:01 STA hFG HOUSTON MAR 12. 1931 1-12PM 855 2 EXPOSURE CALCULATIONS FOR RIBBON TRAY SOLUTIONS Exposure Factors; Lead concentration- 1000 ug/1 Copper concentration 350 ug/1 Dermal absorption, lead and copper- 1%(estimated) Inhalation absorption, lead and copper 10%(Patty's Industrial Hygiene) area exposed 1620 cm (hands and half of arms combined) Thickness of solution remaining on exposed areas 0.5mm # exposures sessions per day=IQ Lead, OSHA PEL 0,05 mg/M Copper, ACGIH TLV 1 mg/M Volume of solution remaining on arms and hands: 1620cm (skin surface area) X 0.25mm(solution thickness) X 1 cm = 10 mm 41cm = 41ml, Estimated absorption levels: Lead, 41ml X lOOOua lead X lmo X 11#X 10 exposures/day X L lOOOug 1000ml O.OKdermal absorption fraction) 0.0041mg/day, which is 1.2% of the total lead absorption allowed for occupational exposure derived from the OSHA PEL for lead(see below). Copper, 41ml X 350uq copper X Ima X XJLX 10 exposures/day X L lOOOug 1000ml 0.0l(dermal absorption factor) = 0.0014mg/day, which is 0.23% of the total copper absorption allowed for occupational exposure derived from the ACGIH TLV for copper(see below). VVV 000006103 FROM*UISTA R&D TO:U1STA MFC HOUSTON MAR 12i 1991 113PM 855 P.0^ 3 Acceptable daily occupational dermal absorption levels based on acceptable occupational inhalation exposure levels; Lead, 0.05mg/M (OSHA PEL) X 8/24(length of work exposure) X 20M/day (breathing rate) X 0.1(inha 1 ation absorption fraction) = 0,033mg/day Copper, lmg/M (ACGIH TLV) X 8/24( length of work exposure) X 20M /day (treating rate) x 0.l(inhalation absorption fraction)* 0.6mg/day vvv 00000610**