Extractable organic matter in urban stormwater runoff. 1. Transport dynamics and mass emission rates

Determination of long-chain alkylbenzenes in environmental samples by argentation thin-layer chromatography/high-resolution gas chromatography and gas chromatography/mass spectrometry

“…Even with high-resolution capillary GC analysis the assemblage of TAB isomers (Figure lb) canriot be completely resolved, and it is apparent that many of the peaks represent more than one compound. The exact composition of synthetic TAB mixtures probably varies slightly depending upon the conditions of alkylation; however, a comparison of our gas chromatographic results with those presented previously in the literature (2,13,18) shows a strong similarity among various products. (In our geochemical study (8), the TAB composition in waste-affected sediments off southern California matched almost perfectly with the mixture provided to us by Monsanto Chemical Co.).…”

“…It should be noted that the THC fraction represents only 20% of the total extractable lipids in this particular sample (13). Thus, the separation of the alkylbenzenes (which constitute about 0.4% of the total lipids) is underexaggerated in this illumination.…”

“…Wilson et al (7) used silica gel TLC to separate amino-PAH in selected coal liquefaction process materials. White and coworkers (13) used a hydrochloric acid precipitation procedure to selectively separate the nitrogen bases from a light coal oil and identified several alkylated anilines by using gas chromatography/mass spectrometry. Acid/base partition has been widely used as the initial step of subsequent multiple-step chromatographic procedures aimed at isolating the amino-PAH.…”

Organic pollutants in the coastal environment off San Diego, California. 2. Petrogenic and biogenic sources of aliphatic hydrocarbons

“…The relative rates of microbial degradation generally are in the order of n-alkanes Ͼ branched alkanes Ͼ cyclic alkanes Ͼ aromatics [27], consistent with their solubility trend. As shown in Figure 5, most of the sediment trap samples contained fairly low concentrations of the low molecular weight n-alkanes (ϽC 25 ), suggesting a substantial loss of these hydrocarbons due to evaporation and/or preferential degradation. The degradation mechanism is further corroborated by the high concentrations of pristane in the samples collected in June (Fig.…”

Pollutant Distribution: A Review of Hydrocarbons in Marine Sediments

“…Water depths in the basins of the Bight are of the order of 1 km, while the maximum depth of Narragansett Bay is approximately 50 m. The Southern California Bight also receives substantially more hydrocarbons associated with sewage effluent, perhaps 10 4 -10 s metric tons per year (Reed et al, 1977), compared with Narragansett Bay's 10 3 metric tons per year (Vleet & Quinn, 1977). In addition, the Bight receives ca 10 4 metric tons per year of hydrocarbons associated with storm runoff (Eganhouse & Kaplan, 1981), and an unknown (but probably small in comparison with sewage) quantity of hydrocarbons from natural oil-seeps and submarine outcrops of organic-rich tertiary shales (Reed era/., 1977). Venkatesan et al (1980) have obtained information about the spatial and temporal variation of hydrocarbons in the Southern California Bight by analyzing sediment cores age-dated by 210 Pb geochronology from the San Pedro Basin (an inshore basin adjacent to major anthropogenic hydrocarbon sources) and the San Nicholas Basin, which is an off-shore basin.…”