Abstract
5β-Stanols, and in particular coprostanol, which is one of the principal sterols of human sewage, show promise as chemical tracers of faecal pollution in estuaries. In the present survey, coprostanol has been measured gas chromatographically in the waters and sediments of the Clyde Estuary. Thus, the bottom sediments contained 0.1–14 ppm of coprostanol (5β-cholestan-3β-ol) together with the corresponding 24-methyl- and 24-ethyl-5β-stanols, while in the seawater samples, the coprostanol concentrations closely paralled the faecal coliform counts. Overall, the amounts of coprostanol correlate well with the location and amounts of the known inputs of sewage from outfalls and dumping.
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