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JTOMflTr E C;ASGLI2iE 65-11 <br />,1 <br /> TABLE 65-2 - Gonzimued <br /> GASOL11TE A D01 —5'a <br />' ;'IIL-I-25017/QPL-25017- <br /> Carboxvlic acids <br /> r - Phosunoric acids <br />' Sulfoxtic acids <br /> 4 eferences 1409,2325,2326.2327,2328 , 1847 <br /> Compounds addressed in other chapters of IRP Toxicology Guide <br /> cAs cited in 2328 <br /> 65 2 ENVIRONMENTAL FATE AND =OSURE PATHWAYS <br /> In this chapcer. the discussions of the environmental behavior of <br /> gasoline will be limited to a discussion of its ma}or components: the <br /> environmental behavior of the trace elements and the many diverse <br /> additives will nor specifically be addressed :iany of the hydrocarbons <br /> characteristics of gasoline have been addressed previously in the more <br /> ' extensive environmental fate section of the JP-4 chapter since chase <br /> hydrocarbons are common to both petroleum fuels. The general <br /> discussions of aliphatic and aromatic hydrocarbons and their behavior <br /> in soil/ground-water systems will not be repeated here; the reader is <br /> referred to the relevant sections of Chapter 64 <br /> Transmort and transformation of individual gasoline constituents <br /> .+ill depend on the physicochemical (and biological.) properties of the <br />' constituents. Some constituents will dissolve more quickly ( in the ` <br /> percolating ground waters) . be sorbed less strongly on the soils (thus <br /> being transported more rapidlv) , and may be more or less susceucible to <br /> degradation by chemical or biological acclon. Thus, as shown in Figure <br /> 65-1. the relative concentrations of the constituents of the fuel will <br /> vary' with time and distance )rots the site of contamination. This <br /> effete is called "weathering. " (This term is also used to describe the <br />' changes CO oil following spills into surface waters where film <br /> spreading and breakup, and differential volatilization, dissolution and <br /> degradation are all involved.) <br /> 65.2.1 Transport in Soil/Ground-water Systems <br /> 65 2.1.1 Equilibrium Partitioning Model <br /> In general. soil/ground-vacer transport pathways for low <br /> concentrations of pollutants in soil can be assessed by using an <br /> equilibrium partitioning model. For the purposes of assessing the <br /> environmental cransporr- of automotive gasoline, a group of specific <br /> 6/87 <br /> R- <br /> L <br />