. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ESTUARINE & FRESHWATER BIOGEOCHEMISTRY Reference: «;»/. Bull. 203: 255-256. (October 2002) 255 Dissolved Iron Cycling in the Subterranean Estuary of a Coastal Bay: Waquoit Bay, Massachusetts Jeremy M. Testa1, Matthew A. Charette, Edward R. Sholkovit:., Matt C. Allen, Adam Rago, and Craig W. Herbold (Department of Marine Chemistry- and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, 02543) Iron oxides have a strong affinity for dissolved phosphates and certain trace metals 11). Charette and
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ESTUARINE & FRESHWATER BIOGEOCHEMISTRY Reference: «;»/. Bull. 203: 255-256. (October 2002) 255 Dissolved Iron Cycling in the Subterranean Estuary of a Coastal Bay: Waquoit Bay, Massachusetts Jeremy M. Testa1, Matthew A. Charette, Edward R. Sholkovit:., Matt C. Allen, Adam Rago, and Craig W. Herbold (Department of Marine Chemistry- and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, 02543) Iron oxides have a strong affinity for dissolved phosphates and certain trace metals 11). Charette and Sholkovitz (2) observed iron oxide-coated sands in sediment cores extracted from the intertidal zone of Waquoit Bay. Massachusetts, and determined that the iron oxides were intercepting phosphates entering the bay in ground- water. They subsequently hypothesized the formation of an "iron curtain," following the oxidation of dissolved ferrous iron to various iron oxides when iron-rich groundwater mixes with intrud- ing saltwater in the subterranean estuary (3). Although the iron oxide-rich sands proved the formation of iron precipitates, more information was needed about the aqueous phase of iron and the conditions surrounding its oxidation. In this study, we have mapped the distribution and concentration of dissolved iron in the subterranean estuary of Waquoit Bay. Water samples were collected from two transects on the north shore of Waquoit Bay. A map of Waquoit Bay is included in Charette et al. (4). One transect spanned 178 m and was orientated parallel to the beach; the second transect, which we examine in this paper, was placed perpendicular to the beach. This 17-m transect extended from the berm of the beach to the intertidal zone. Water samples were collected at intervals to depths of up to 8 m using retract-a-tip, well-point piezometers and a peristaltic pump. At each depth, water was pumped from the ground and immedi- ately filtered to remove particul
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