Computer Science
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..967u&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 4, pp.967-978
Computer Science
3
Scientific paper
The total concentration of I is commonly higher in surface terrigenous sediments relative to more deeply buried material. Diagenetic release, loss of dissolved I during burial, and back-reaction of I with the solid phase under oxidizing conditions contribute to I enrichment near the sediment/water interface. In order to differentiate between scavenging of dissolved I by organic matter or metal oxides, the diagenetic behavior of I was examined in the Fe-poor carbonate sediments of Florida Bay, Florida. In this environment I is released by organic decomposition at I/C ratios similar to terrigenous environments (~0.5 mmole/mole), transported to the oxygenated sediment/water interface, and lost to the overlying water. The dissolved I flux from these deposits is roughly equivalent to the production rate within the deposit (~10 mole/m 2 /day at 28°C). No significant enrichment is observed in the solid phase. Dissolved iodine transport within the sediment column may also be controlled by non-steady-state lateral diffusion into burrows. These observations, together with laboratory experiments which demonstrate IO - 3 scavenging by Fe-oxyhydroxides at pH 8, imply that enrichment of I in terrigenous surface sediments results predominantly from the initial oxidation of I - to IO - 3 by microorganisms, followed by sorption on Fe oxides. Upon burial and reduction during anaerobic decomposition, this metal-associated I is released to solution, in a manner similar to phosphate.
Aller Robert C.
Ullman William J.
No associations
LandOfFree
The geochemistry of iodine in near-shore carbonate sediments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The geochemistry of iodine in near-shore carbonate sediments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The geochemistry of iodine in near-shore carbonate sediments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1289058