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JOB HAZARD ,ANALYSTS <br /> GASOLINE RANGE HYDROCARBONS <br /> The main compound of interest is petroleum range hydrocarbons <br /> Gasoline and its constituents pose health hazards in two major <br /> classifications . Explosivity and toxicity. The extreme <br /> flammability of gasoline is commonly known The lower explosion <br /> limit (LEL) of gasoline vapor is 1 .3 percent in air If the <br /> concentration of gasoline vapor in air exceeds 1. .3 percent (13 , 000 <br /> ppm) and sufficient quantities of oxygen are present, then the <br /> introduction of sufficient heat, spark or flame will result in an <br /> explosion. <br /> A lesser known health hazard resulting from exposure to gasoline <br /> is toxicity. Several common constituents of gsoline have been <br /> linked to various health problems . The constituents of gasoline <br /> that have been shown to cause serious health problems resulting <br /> from relatively minor exposures include Benzene, Toluene, meta, <br /> para and ortho xylenes, Ethyl benzene, and Tetraethyl lead. <br /> Typical percentages (by weight) of these constituents in gasoline <br /> are . Benzene - 0 . 12-3 50%, Toluene - 2 . 73-21 . 80%, meta xylene - <br /> 1. 77-3 87%, para xylene - 0 . 77-1. 58%, ortho xylene - 0 68-3 . 686%, <br /> and Ethyl benzene - 0 36-2 . 86%. typical percentage of Tetraethyl <br /> lead is not available <br /> Units used to describe occupational exposures to hazardous <br /> �� <br /> substances include- Exposure limit, also known as Threshold <br /> Limit Value" (TLV) , Ceiling Limit, and the concentration level <br /> that is "Immediately Dangerous to Life and Health" (IDLH) The <br /> EXPOSURE LIMIT defines the maximum concentration of a substance to <br /> which one can be exposed during an 8 hour period without suffering <br /> significant health effects. The CEILING LIMIT is the <br /> concentration level that cannot be exceeded at any time . A <br /> suitable respirator and/or other suitable breathing apparatus and <br /> body protective equipment must be worn if concentration values <br /> reach or exceed the ceiling limit . the IDLH LEVEL represents a <br /> maximum concentration from which one could excape within 30 <br /> minutes of respirator failure without experiencing escape- <br /> impairment or irreversible health damage . - -The notation "Ca" <br /> appears in the IDLH column for all substances that NIOSH considers <br /> to be potential human carcinogens . <br /> M <br /> ti <br />