Document yrgpa8Jn6XqJgpJG9Qmvyjz4r

0. E. Kurt R, J. Plunkett H. W. Wheeler ETHYL CORPORATION - BAO?ON ROUGE, LOUISIANA MUFACTURI1TG DEPARTMENT ~ DEVELOPMENT SECTION OUTLINE OF DEVELOPMENT SECTION WORK SINCE THE COMMITTEE MEETING OF JUKE l?, 1947 For Discussion at Lead Contamination Advisory Committee Meeting Wilmington, Delaware September 18, 194?' ANALYTICAL ?4ETK0DS D? 46-5'TC, Determination of TEL in .Air - A Continuous Recorder The completed design of an Improved dithizons recorder for field use has been presented in DSM 47-35. The medium quarts spectrograph (basic component of the electronic spectrograph) has been received from Eauoeh and Lomb and construction of the electronic spectrograph for TEL lead detec tion is In progress at LSU. M 47-1TC Determination of Le;id in Urine Arrangements have been mads with the local Medical Department to collect urine samples for comparative analyses by the routine method and the visual comparator method. On a current trip, Mr. Snyder is stopping .at Kettering Laboratory to develop further plans. SURVEYS DP 46-pTC, Air Contamination In T5L Manufacturing buildings Measurement of flow rates and lead, eoneentx'ations in most TEL area exhaust streams has been completed. Work nears completion on the remaining, less Important, streams. In agreement with pre vious reports, the results to date show that the major contamination sources are the main exhausts and copper ducts from the manufacturing buildings and the exhausts from the furnace buildings. About 95$ of the lead discharged to the air comes from these sources. A -9 7 p -> -hire am IT47 Surv cy 1940 Survav k. .Fb/Cu 5kfc / (1,0 . rb/Day)" TLbTPVDSyr ``E'' furnace "E:: Copper Duct k;:' Building Main Exhaust 0.094 e up-- . 02 flender Main Exhaust , 02 : J -k'y . 015 Blender kilter Room Exhaust .005 'lank Car- Clean-Out House '.leIt Pet \} . 004 Basel House Hair Exhaust 0C4 :'E" bash House Filter Doom .001 Trheal for Area 17.0 8.6 8.4 4. 6 O 0.5 .2 * *. ,0 1 78. Oa 24.5? 48.1 24. ?b 13.5 7-8 2.0 2.1 409.b Assumes that each of other* four buildings wash cocoes and furnaces contributes the same contaiaination as :;lf;. vov""o of five buildings. actual bocal for cues, since duplicating unite were separately measured . fhs Ifl 7 survey indicates that less than half as much head is being exhausted to the air as in 1945. chile operating " "aj housekeeping kiTgrnverne iron are considered to be she principal contributors to this reduced centarnination figure. It must be roeegninec. that differencea in the analytical method used on the uv nay also contribute, The method used in 1547 is an Improve cons over that employed in 1945 and therefore she results are more dependable. PROTECTIVE EQCTIPMSHT SP pp6-b9TC..Impermeable Gloves Tests of Elastomer lOp-ccated gloves in the T.3L area continue favorable. Supplies of the gloves have been sent to Deepwater and Detroit for independent evaluation. Meanwhile, two outside companies (Midwest Rubber Company, Detroit, Michigan; Sdmont Manufacturing Company, Coshocton, Ohio) have submitted pre liminary samples of this type glove for* our evaluation prior to placing an order for test supplies. TEL-penetration tests on elastomer-coated gloves (with portions of fingers continuously submerged in liquid TEL) showed no penetration for 715 hours, A sample taken at 17 hours showed that detectable penetration had begun, and this was confirmed by a sample at 24 hours. The average penetration during the 24 hours was only six raicrograms per sq. cm, of exposure area per hour. These results are in agreement with previously reported KE 0012764 -3 bottle-test permeability data on elastomer films. The test con ditions are considered much more severe than conditions of actual use, and the results indicate that the elastomer-coated gloves provide ample protection against TEL contamination. Tests are in progress to select suitable materials for the fabrication of ventilated protective clothing. Tentative specifications for the clothing articles have been submitted to MSA and Hodgman Rubber Company, who will design and fabricate the clothing. DECONTAMINATION DP 46-1TC , Decontamination, of TEL-in-Air .Streams - Lab. Studies Laboratory ests on the adsorption of TEL by activated chare oal show that no detectable temperature rise occurs when passing TEL saturated air through the charcoal bed under normal conditions. However when the charcoal is partially saturated Lth TEL, auto_igs'nniition occurs if the inlet air stream is heated to approximately 100C . Tests to determine whether TEL is adsorbed as such or undergoes a reaction during contact with charcoal gave some evidence that reaction takes place. Exit air from the scrubber has an odor characteristic of hydrocarbons rather than of TEL. No TEL could be recovered from the charcoal by treatment with steam or vacuum. Analyses of the lead content of the charcoal showed that about twor-nxrcs ox tne weigrrc of material adsorbed was accounted for as metallic lead. In order to test the relative performance of various charcoals ive samoles from various sources were tested for TEL removal C c?.plC J- Gy 0m-1 d vxej . fa.ficu/ iencyj with results as tabulated. The results 3 how the first three charcoals lit ted are c omp arably satisfactory. Mean Micrograms Fb/cu.ft,, In Effluent from Charcoals Contacting TEL-Air Mixtures at ' <P Normal Breathing Rate fo Wt. Increase Due to TEL 5 Hours 20,000 Micrograms In Inlet. 120 Hours 80 Micrograms Pb/ cu.ft. in Inlet Columbia * GMA GMC* All-Service * Sample A** 40 46 18 15 7 4 4 7 200 470 2 5 2 3 17 A mixture of charcoal with other adsorbents. Experimental sample secured through Dr. Kehoe KB 00.12765 4- Air sainp3.es taken before and after the air filters (oiled. Fiberglass) in the Development Section Laboratory show that the air to the filters contains a maximum of 0.5 microgram of particulate lead per cubic foot and that the filters have a removal efficiency approximating 50$. The amount of particulate lead penetrating the similar filters* in the new laboratory will be much less because the building is further from the TEL area. Furthermore, there will be a reduction of atmospheric contamination at the source when the Pease-Anthony scrubber installation is complete. DP 46-2'TC , Removal of Lead Dust from Smelter Plue Gases The Pease-Anthony scrubber continues to operate with a high service factor and satisfactory performance. Following a series of tests on the unit and several contacts with hr. Anthony, an equipment design was prepared for the new units to be installed on the other furnaces. To provide more efficient dust removal, the new units will be different from the present one in four prin cipal respects: (1) the scrubber will oe smaller. C 2) the fan will be larger, (3) the size of the scrubber inlet will be fined, and ft) the entry of dilution air will be minimized by an automatic damper actuated by the furnace draft. This'project is now in the hands of the Engineering and Maintenance Section for preparation of detailed design and preparation of project papers. It is esti mated that the proposed new Pease-Anthony scrubbers will be Installed and operating within six to eight months. GViB/np 9-15-47 KE 0012760