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Terrestrial plants, hydrocarbons

Data on the concentration of hydrocarbons from gasoline contamination in media other than air, water, and soil are very limited. This is due, at least in part, to the difficulty in tracing the source of hydrocarbon contamination in other environmental media such as food, fish and shellfish, and terrestrial plants and animals. Samples of bivalve mollusks collected 2 days following an accidental spill of gasoline into Block Island Sound, Rhode Island, contained low levels of gasoline compounds (Dimock et al. 1980). However, there were no adequate control samples by which to confirm background levels of these compounds in the shellfish, so it is not certain that the contamination resulted from the spill. [Pg.110]

Hydrocarbons found in the environment are of diverse structure and are widely distributed in the biosphere, predominantly as surface waxes of leaves, plant oils, cuticles of insects, and the lipids of microorganisms. Straight-chain HC, or alkanes, with carbon number maxima in the range of C17 to C21 are typically produced by aquatic algae. Conversely terrestrial plants typically produce alkanes with C25 to C33 maxima. Plants also synthesize aromatic HC such as carotenoids, lignin, aUcenoids, terpenes, and flavenoids. Polycyclic... [Pg.1617]

Aliphatic hydrocarbons, a diverse suite of compounds, are an important lipid fraction which is either natural (i. e., from photosynthesis by marine biota inhabiting the surface waters or by terrestrial vascular plants) or anthropogenic (i. e., of petroleum origin from land runoff, and/or industrial inputs). Aliphatic hydrocarbons have been studied and characterized from various environmental multimedia [1,53-56,99-109]. [Pg.7]

Organic matter can provide important clues for paleoenvironmental assessments (Table 5) (de Leeuw etal., 1995). Because some biomarkers point to specific taxa, they can also act as indicators of specific habitats. Paleoenvironmental conditions that are often readily inferred from the presence and distribution patterns of biomarkers are marine (e.g., (66d)), terrestrial (e.g., (61)), and deltaic environments where plant and algal hydrocarbons are mixed or show stratigraphy-related flucmations in abundance. [Pg.3966]


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See also in sourсe #XX -- [ Pg.342 , Pg.346 , Pg.350 , Pg.351 ]




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