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gastrointestinal symptoms with a metallic taste in the mouth. Liquid alkyllead may penetrate the skin <br />without producing appreciable local injury. However, the decomposition products (i.e., mono-, di-, <br />and triethyllead compounds) in dust form may be inhaled and result in irritation of the upper <br />respiratory tract and possibly paroxysmal sneezing. This dust, when in contact with moist skin or <br />ocular membranes, may cause itching, burning, and transient redness. TEL itself is irritating to the <br />eyes. The absorption of a sufficient quantity of TEL whether briefly at a high rate, or for prolonged <br />periods at a lower rate, may give rise to a variety of symptoms which include mild anxiety, toxic <br />delirium with hallucinations, delusions, convulsions, and acute toxic psychosis. Physical signs are not <br />prominent; but bradychardia, hypotension, increased reflexes, tremor, and slight weight loss have <br />been reported. When the interval between the termination of exposure and the onset of symptoms is <br />short, an early fatal outcome may result.Exposure to TML may produce insomnia, bad dreams, <br />restlessness, anxiousness; hypotension; nausea; aneroxia, delirium, mania, convulsions; coma. The <br />points of attack for both TEL and TML are the central nervous system, cardiovascular system, <br />kidneys and eyes. The acceptable method for monitoring lead contamination in humans is hair or <br />blood analysis. The permissible level of lead in blood is 70 micrograms/milliliter. The airborne PEL is <br />0.1 mg/m3, and is determined by air monitoring and analysis by NIOSH Method 7300. Other <br />constituents of gasoline can include but are not limited to benzene, toluene and xylene. Exposure to <br />there compounds can cause nausea, dizziness, visual disturbances, narcosis and collapse. Chronic <br />effects include central nervous system disorders, respiratory tract irritation, tearing, lassitude and <br />immunological disorders. <br />The PEL/TLV (permissible exposure limit, threshold limit value), STEL (short term exposure limit) and IDLH <br />(immediately dangerous to life and health) values are listed below: <br />PEL/aLV <br />STEL <br />IDHL <br />Lead <br />0.1 mg/m3 <br />Tetraethyllead <br />0.075 mg/m3 <br />0.3 mg/m3 <br />40 mg/m3 <br />Tetramethyllead <br />0.07 mg/m3 <br />0.5 mg/m3 <br />40 mg/m3 <br />Benzene <br />10 ppm <br />25 ppm <br />2,000 ppm <br />Toluene <br />100 ppm <br />150 ppm <br />2,000 ppm <br />Ethylbenzene <br />100 ppm <br />125 ppm <br />2,000 ppm <br />Xylene <br />100 ppm <br />150 ppm <br />10,000 ppm <br />