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Surface sediments samples were collected from 9 stations of the Cochin estuary during the monsoon, post-monsoon and pre-monsoon seasons and were analyzed for grain size, total organic carbon (OC), total nitrogen (TN) and stable isotopic ratios of carbon (δ 13 C) and nitrogen (δ 15 N) to identify major sources of organic matter in surface sediments. Sediment grain size is found to be...