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. . . .. <br /> i <br /> I J.• I <br /> f JOB HAZARD ANALYSIS <br /> GASOLINR 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 /> If flammability of gasoline is commonly ]mown. 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 /> ' i ies of oxygen are present, then the <br /> ppm) and sufficient quantit <br /> !,01 introduction of sufficient heat, spark or flame Hill result in an <br /> exp!r►Gion. F <br /> i <br /> .l <br /> I ! <br /> I , 1A 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 /> !! itis from relatively minor exposures include Benzene, Toluene, meta, <br /> ' para and ortho xylenes, Ethyl benzene, and Tetraethyl lead. <br /> iTypieal percentages (by weight) of these constituents in gasoline <br /> "I are: benzene - 0.12-3.50 , Toluene - 2.73-21 .80%, meta xylene - <br /> iand <br /> 1.77-3.87%, para xylene - 0.77-1.58%, ortho xylene - 0.68--3.6$6 , <br /> 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 /> `` - substances include: Exposure limit, also known as "Threshold <br /> Limit Value" (TLV) , Ceiling Limit, and the concentration level <br /> ll !i that is "Immediately Dangerous to Life and Health" (IDLH) . The <br /> ai ; t; S LI IT defines the maximum concentration of a substance to <br /> �i which ane can be exposed during an 8 hour period without suffering <br /> �� ! ! significant health effects. The CEILING LIMIT is the <br /> -I <br /> concentration level that cannot be exceeded at any time. A <br /> suitable a <br /> itable respirator and/or other suitable breathing apparatus and . <br /> !4 ' body protective equipment must be worn if concentration values <br /> the I LS SV represents is a <br /> Bilin limit. P <br /> reach or exceed the ceiling <br /> maximum concentration from which one could excape within 30 <br /> minutes of respirator failure without experiencing escape- <br /> health <br /> health damage. <br /> The notation <br /> impairment or irreversible9 <br /> f <br /> i. a ears in the IDLH column for all substances that NIOSH considers <br /> � PP <br /> to be potential human carcinogens. <br /> EXPOSURE TABLE <br /> 3 {. � SUB <br /> STAN TLV_TWA TL -sT TLV-CETLItIG IDLH <br /> Benzene .Ol ppm N/A N/A 3000 ppm (Ca) <br /> Toluene 100 ppm 150 ppm N/A 2000 ppm <br /> / 0'I <br /> 0 A 1 0}Xylene 7.00 ppm 150 ppm N ppm <br /> ! <br /> 1 r <br /> F <br />