Early this week, Vernon McKenzie of the Public Health Service was in Wilmington and stated that their plans for the collection of air samples for lead analysis was progressing according to schedule.

You have indicated your desire to evaluate a potentially hazardous exposure to lead and pr.

I think the difficulty about dismissing the use of the chelating agents in the care of adult workers too quickly is that there may often be no way of stopping the lead exposure for economic reasons.

.: A KNACKERY SURVEY OF LEAD POISONING INCIDENCE IN CATTLE IN NORTHERN IRELAND.

Early this week, Vernon McKenzie of the Public Health Service was in Wilmington and stated that their plans for the collection of air samples for lead analysis was progressing according to schedule.

The colorants are therefore free from lead pigments and are alkali resistant."

Common sense would suggest that the relationship between hemoglobin and blood lead should be curvilinear with a "no effect" level occurring in the low blood lead range and an increasing effect as the blood lead values rise.

This is certainly not the proper way to protect men against occupational exposure to lead.

38--Industrial Toxicology TABLE 38-A EXCRETORY AND BIOLOGIC THRESHOLD LIMITS Urinary TLV'9 should be used for Aniline Antimony Arsenic Arsine Benzene Boron trifluoride Calcium arsenate Chlonnated benzenes Cyanide Fluoride Hydrogen bromide Hydrogen cyanide Hydrogen fluoride Hydrogen selenide Lead arsenate Mercury Molybdenum Nickel Nickel carbonyl Nitrobenzene Nitrogen tnfluoride Parathion Selenium Selenium hexafluoride Stibine Suifuryi fluoride Tellunum Tellurium hexafluoride Thallium Uranium Zinc chloride Zinc oxide Blood TLVs are more applicable than excretory limits Cadmium dust Cadmium fume Lead Manganese Methyl bromide Blood and/or breath TLV's should be applicable Carbon monoxide Nitnc oxide Sulfur hexafluoride Breath analysis good for many Alcohols Aliphatic hydrocarbons Chlorohydrocarbons Ketones NOTE.

.< t Industrial Hygiene Digest January,1965 Fluoridc(s) effects on animals plant metabolism 45 43 Great Britain future of industrial medicine Gynecologic problems in aviation 18 20 Hearing loss, acoustic trauma fel Heat, effect of "dry" on circulation 73 71 Heat stress and heat disorders (bk. rev.) 14 Hernia, 5,903 cases of inguinal 23 Human engineering muscular exercise at great altitudes work tolerance: age and altitude Hyperbaric chamber, use of oxygen 68 69' 19 India, industrial pulmonary disease Industrial medicine future in Great Britain service in a catastrophe 63 18 102 Influenza comparative trial of vaccines P trial of oil-adjuvant vaccine 26 25 Insecticides blood test for aldrin and dieldrin mode of action of DDT survey of workers exposed to chlordane toxicity and metabolism of dieldrin of dieldrin in rats 56 58 57 54 55 Laser, treatment of tumors 37 Lead, porphyrins in lead workers 50 ISSI U------ u Lead poisoning distribution in rat in rabbit and man 49 51 Magnetic fields, effecton squirrel monkeys 75 'Manitoba, brucellosis in 35 Mercury, volatilization by bacteria 46 Mercury poisoning, from old airplane batteries 47 Nashville, sulfur dioxide inventory 83 New Jersey emission standards for solid particles in air pollution 98 Nitrogen oxides determination in air and exhaust gases 84 Noise, effect on body functions 74 Noise control and reduction forced-draft-fan in air conditioning system 87 86 Odor(s), control in cattle yards 92 Oxygen, use in hyperbaric chamber 19 Ozone measurement by chemiluminescent vertical distribution in atmosphere 79 80 Pectin retardation of avian atherosclerosis 29 Pesticidefs) esterase inhibitors Saskatchewan experience water pollution by organic 59 53 105 Pesticides and pest control 52 Phosgene, production of emphysema 44 Plastics toxicology and dermatology in production of (bk. rev.) 15 Pneumoconiosis, in India 63 Pneumonitis, in epizootic bovine abortion 27 Protective clothing ensemble for Titan II pressure suit cooling 89 88 Radioactive, waste disposal 77 St.

Whitson Jack Wilder Jack Wilder Looookk Ahead with Lead U>01181 N 3675 LEAD INDUSTRIES ASSOCIATION, Inc. 292 MADISON AVENUE NEW YORK.

Of special interest among the findings of this 16-country study is that the average lead levels in the blood of New Guinea aborigines, who lived away jfrom industrialization and motorization, were comparable with those of persons living in industrialized countries.

KJA:EU be: Carter White Lead (2) R.

LEAD ZINC RESEARCH ORGANIZATION, INC. . =92 VtAOiSOW AVENU5. .* .

June 15, 1964 x am of tue opinion that the exposure to lead which resulted in the illness of these men, as you have indicated, occurred within the tank.