The lead con centration in the urine is disproportionately high, but not tinreasonably so, and it can be regarded as physiologically compatible with the two results obtained on the blood." ____ was removed from the lead area on April 24, 1947.

NUMBER: QUALITY: A014 First PIGMENT: 65* Carbonate White Lead 35# Leaded Zinc 15# Leaded Zinc Sulphate White Lead LB. 830 185 165 170 HELD IN GALLONS 14.6 3.9 3.5 3.1 VEHICLE: 35# Bleached Linseed Oil 349 Raw Linseed Oil 233.1 Turpentine 9 Mineral Spirits 38.4 Heat Bodied Linseed 32 Sodium Carbonate Solution 9.5 Drier 31.0 45 Gal. 30 1 1/4 5 3/4 4 1 1/8 4 1/2 CALCULATED YIELD 2052 MANUFACTURING LOSS 3# ACTUAL YIELD 116.7 Gal. 3.5 ~TIS72""3iT.

Res ea r c h l a b o r a t o r i es Di v i s i o n GEN ERA L M O T O RS CO RPO RA T IO N POST OFFICE BOX 188, NORTH END STATION D ET RO IT 2, M IC H IG A N July 7, 1949 Dr* R*| A* Kehoe Collets of Medicine Univeijsity of Cincinnati Eden Avenue Cincinnati 19, Ohio ~ Dear ^ob: Your opinion on a matter pertaining to lead intoxication would be very welcome* Questions regarding the effects of small changes in the composition of lead solder (between 2 and 1Q$ tin up to 1% arsenic or antimony and 90$ or more lead) have been raised by some of our executives* In your opinion could these small changes, especially the reduction of the tin content to less than 1Q$ be related to an increase in the absorption of solder dust into the human system possibly due t<j> greater solubility, scalier particle size, or other phenomena* Do you think that research into this phase of the subject would be warranted in seeking an explanation of an increase in either blood or urinary leads or symptoms of intoxication in persons engaged in soldejr application and solder removal.

Lead - lba.

TRADE NAME; KUHN' S ALL-PURPOSE SOFT CATEGORYs WHITE LEAD CARBONATE IN COLOR!

B&dal, Willard Storage Battery Company Lead Analyses Urine Analysis Number = itfA-7181 Volume = 100 ml.

I would he very much obliged if you would send me reprints of your most recent work on lead, especially with reference to lead in the "blood and urine.

Director, Kettering Labori-tery of Applied Physiology College of Medicine University of Cincinnati Cincinnati Ohio Dear Doctor Kehoe: This letter is to inquire whether any data has come to your attention on normal values for lead in blood and lead in urine in human infants and small children. .~ M. children*s hospital of this city has asked this Bureau to analyze samples in cases- of suspected and proven lead encephalitis.

No. 178,353, Filed December 6. 1957 We have Just received notice that the Examiner has changed the title of the above-mentioned application from "Method of Producing White Lead" to "Electrochemical Method of Producing White Lead".

, or borates generally are used in have not occurred does not mean that So much for the general picture ing fluxes some metals require fgg exposures to known toxic materials may be ignored Determination of the concentration of the toxic material in the air is im- portant in evaluating the exposure Tests of this type are indicative not only of the degree of contamination but also in some instances which operation is the major offender The apparatus used in collecting the contaminant and the method used in estimating the amount present in the atmosphere vary with the type of material Tests of this type are spec- ialized in nature and are beset with many pitfalls which can lead to erroneous conclusions if done by in- experienced personnel Permissible Limits In a discussion pertaining to toxic materials it is generally necessary to quote permissible concentrations or as it is sometimes expressed mum allowable concentrations missible limits or threshold limits These terms are used extensively by industrial hygienists to indicate con- centrations of a substance in the air which are considered compatible with good health The limit usually applies to exposures of eight hours duration for a prolonged period The limits are for the most part advisory standards or bench marks which are practical to meet In general these limits are derived from three types of evidence all of which have value and limitations I.

Tooele Miami Ra t It ns Lead - lbs. .

The increase in the 'White Lead Department is due to increasing the anticipated sales of white lead for this six months' period by 125 tons.

hite lead.

Tooele Miami Ra t It ns Lead - lbs. .

The amount of lead which may be corroded for white lead has been curtailed by an amendment to the lead conservation order, which has resulted in decreasing the lead required by the White Lead Department for this period by 746 tons.