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The other BTEX compounds (toluene, ethylbenzene, and xylenes) may cause irritation to the <br /> eyes, nose and respiratory system, and dermatitis. Acute exposure can lead to central nervous <br /> system effects including headache, dizziness, confusion, and irritability. Exposure to toluene <br /> may also result in pupil dilatation, nervousness, and insomnia. Elevated concentrations of <br /> xylene isomers may lead to corneal damage, and gastrointestinal symptoms including abdominal <br /> pain, nausea and vomiting. Table 1 presents a summary of the chemical exposure limits and <br /> characteristics associated with the BTEX compounds. <br /> Exposure to petroleum hydrocarbons may also occur. Petroleum hydrocarbons refer to straight <br /> and branched alkanes and alkenes which present a fire hazard in circumstances, such as the <br /> presence of flame, excessive heat or strong oxidizers. An exposure limit for petroleum <br /> hydrocarbons has not been established due to the vaned chemical composition. Presently, there <br /> are no known chronic health hazards associated with petroleum hydrocarbons. <br /> Table 1 Chemical Exposure Limits and Characteristic <br /> OVA' <br /> Relative TLV3 Odor <br /> Response 8hr IDUP Flammable Threshold <br /> Chemical IPL % TWA Level Range % (ppm) Notes <br /> . Benzene 9.24 150 1 ppe Ca 1 3-7 9 468 C,F <br /> Toluene 882 110 50 ppm 21000 1.2-7.1 017-40 F <br /> ppm <br /> Ethylbewme 876 100 100 ppm 2,000 1 0-67 025-200 F <br /> ppm <br /> Xylene 856 111 100 ppm 1,000 10-70 005-200 F <br /> ppm <br /> I <br /> (1) Ionization potential in electron-volts (W). <br /> ' I <br /> (2) Century Organic Vapor Analyzer relative response to the compound in percent. <br /> , <br /> (3) Threshold Limit Value as the airborne 8-hour rime-weighted average (TWA) established <br /> by the Amencan Conference of Governmental Industrial Hygnemsts (ACGIIH), 1993- <br /> 1994. <br /> (4) Immediately Dangerous to Life and Health level as published in the National Institute for ` <br /> Occupational Safety and Health (NIOSH), Pocket Guide to Chemical Hazards, 1990 <br /> edition. Ca = Carcinogen <br /> ! i <br /> E I I <br /> i I ! <br /> C-Carcmogen• F-Flammable. <br /> I <br /> a�naiw+stia�oasaus�++ses�+s-�wrs � ,II,,� I <br /> I I <br />