Other
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2449s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 12, pp.2449-2458
Other
1
Scientific paper
Total dissolved Ti in Chesapeake Bay and the Amazon River Estuary exists at nanomolar to subnanomolar concentrations. In both estuaries, dissolved Ti is removed at low salinities in the course of estuarine mixing, most likely by coagulation of colloidal metal, perhaps with stabilization of the aggregates by organic material or by adsorption onto other particles. Titanium concentrations in 0.2 m-filtered surface samples obtained on a summer survey of Chesapeake Bay range from 0.52-0.87 nM at 0.1 salinity, decreasing to 0.07-0.28 nM at higher salinities. The extent of removal is 65%. Variable but low levels in the middle estuary probably reflect inputs from tributaries to the bay. A comparison of Ti concentrations in oxic surface waters and suboxic and anoxic bottomwaters shows no consistent evidence for Ti release from dissolving Fe or Mn phases. On a summer survey of the Amazon River Estuary, Ti concentrations in 0.22 m-filtered surface waters decrease from 3.3-7.1 nM at salinities of 0.3-0.8 to 0.27-0.62 nM above a salinity of 5, for a removal of> 90%. Slight elevations in Ti concentrations at salinities greater than 34 may result from resuspension of sediments on the dynamic Amazon shelf. Using the Amazon River Estuary as an example, at least 90% of the global flux of dissolved Ti from rivers is removed to particles at low salinities. Considering this, the effective global flux of dissolved Ti from rivers to the oceans, here estimated at 2 × 10 7 mol y -1 , is 10-100 times lower than what has been previously estimated based on river inputs.
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