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Hydrocarbons were measured in sediments from seven box cores. Sampling stations ranged over the St. Lawrence Estuary and Gulf (5 to 34 per mile square), to 550m water depth and included (1) a shallow, urbanized basin, (2) a fjord, (3) an estuarine upwelling zone, and (4) the open basin in the Gulf. Concentrations of n-alkanes declined exponentially with distance from the St. Lawrence River. A series of branched alkanes (C20 and C25) showed different spatial distribution, reflecting their possible origins. Individual regions could be distinguished on the basis of their hydrocarbon pattern using principal component analysis. Sediment samples were also …
