Laserfiche WebLink
<br /> <br />,_.....~_'"'->.,'----~.-_-">-.. -.- <br /> <br /> <br />':: <br /> <br /> <br />2221. <br /> <br />Division: Air Pollution Control Division <br />James M. Lents. Director <br /> <br />F. LEAD (Pb) EXpOSURE <br /> <br />Mobile sources are the largest contributors of airborne lead in Colorado. 'l'be main emitting group are pre-:-catalyst equipped automobiles that <br />burn leaded gasoline. <br /> <br />The chief stationary source of lead in Colorado is the processing of concrete. Lead emitted by statl00ary sources also may be in the fora of <br />both coarse and fine particulate matter. A small fraction of lead e_tesioDs may be .in the vapor phase. primarily ea1ssions fro. gasoline <br />production or transfer at service stations. <br /> <br />The most important sources of lead exposure in hwnans and other animals are ingestion of foods and beverages I inhalation of airborne lead. and <br />the eating of non-food substances. Undesirable effects of lead are seen only in humans and animals; plants and 1rian1mate objects are not knOWD <br />to be injured by existing exposure levels. Clinical lead poisoning Is accompanied by symptoms of intestinal cramps. peripheral nerve <br />paraly.sis. anemia. loss of muscle tone. and severe fatigue. Individuals witb clinical cases of lead poiaoning usually have blood levels above <br />80 ugllOO ml. Subtle effects of lead exposure~ as 1ndicated by tbe appearance of excess delta-aalno1evu1iaic acid 1n the ur1ne. appears at <br />blood levels between 40 and 60 ug/lOO g. Average lead levels in the blood usually are around 20 uS/100 g. General health 'effects are shown in <br />Table II-5. <br /> <br />TABLE Il-5 <br /> <br />ESTIMATED HEALTH EFFECTS LEVELS FDR LEAD EXPOSURE <br /> <br />EFFECTS <br /> <br />EXpOSURE DURATION <br /> <br />Alad inhibition erythrocyte protoporphyrin <br />elevation. <br /> <br />10-30 Hicrograas Lead per <br />diciliter of blood (less than <br />1.5 m1crogram per cubic meter <br />of air exposure over 3 months <br />estt.ated. ) <br /> <br />Increased urinary ala excretion. anemia. <br />coproporthyrin elevation. <br /> <br />40-50 IBicrograms lead per <br />deciliter of blood (greater <br />than 1.5 micrograms per <br />cubic meter of air) <br /> <br />-24- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />.. <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />.. <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br />., <br /> <br />- <br /> <br />- <br /> <br />... <br />