Nutrient samples were collected from seven river stations and seven bay stations on September 4th. All bay stations were sampled at the surface and bottom. In the five days prior to sampling, there was trace precipitation recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN) and total dissolved nitrogen (TDN) were observed at Blackstone River @ Stateline (TN = 1,340 ppb, TDN = 1,560 ppb). The highest dissolved inorganic nitrogen (DIN) concentration was observed at Moshassuck River @ Footbridge at Mill St. (1,158 ppb). The lowest TN and TDN were observed at Blackstone River @ Slater Mill (TN = 951 ppb, TDN = 958 ppb), while the lowest DIN was observed at Pawtuxet River @ Broad St. (665 ppb).
Among the bay stations sampled, the highest surface total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) were observed at Pawtuxet Cove (TN = 963 ppb, TDN = 610 ppb, DIN = 368 ppb). The lowest surface TN and TDN were at Conimicut Point (TN = 456 ppb, TDN = 167 ppb, average of duplicates), while the lowest surface DIN concentrations were observed at Conimicut Point, Edgewood Yacht Club and Pomham Rocks (13 ppb, reflecting minimum detection limits).
The next scheduled sampling date is September 18, 2024.