Abstract
We have determined the isotopic composition and concentration of Os, a platinum group metal, in estuarine sediments from New Haven Harbor and adjacent Long Island Sound. Anthropogenic Os is present in recent sediments and is isotopically distinct from natural Os. Preindustrial sediment from the Long Island Sound FOAM core has ∼40 pg of Os/g and 187 Os/ 186 Os=8.8. Surface sediments from the same site and from New Haven Harbor have 64-774 pg of Os/g and 187 Os/ 186 Os=1.8-5.0. The 187 Os/ 186 Os ratio is inversely correlated with Os concentration (ng of Os/g of dry sediment), suggesting simple mixing between more radiogenic natural Os and less radiogenic anthropogenic Os
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