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Dissolved organic iodine in marine waters: role in the estuarine geochemistry of iodine

Journal of Environmental Monitoring Vol - 3 Issue - 1

Journal of Environmental Monitoring Vol -2

Dissolved organic iodine in marine waters: role in the estuarine geochemistry of iodine

Content Provider	Royal Society of Chemistry (RSC)
Author	Cheng, Xian-Hao Wong, George T. F.
Copyright Year	2001
Abstract	Non-volatile dissolved organic iodine (DOI) can be a major, or even the dominant, species of dissolved I in coastal, inshore and estuarine waters. It can be converted to IO3− in the presence of an oxidizing agent and to I− by reacting it with a reducing agent. Depending on the exact experimental conditions, the yields of these reactions may not be quantitative. In previous analytical schemes for the determination of IO3−, I− and DOI in marine waters, if oxidation or reduction steps are involved and the concentrations of one or more species are estimated by difference, the presence of DOI can lead to an overestimation of the concentrations of the inorganic species determined by difference and an underestimation of the concentration of DOI. In two cruises covering the James River to the southern Chesapeake Bay and from the southern Chesapeake Bay to the Atlantic, above a salinity (S) of 2, the contribution of DOI to total I increased with decreasing salinity and reached a maximum of 80%. DOI, I− and IO3− were successively the dominant form of dissolved I at 0.1 < S < 15 in the James River estuary, 15 < S < 30 in the Southern Chesapeake Bay and S > 30 in the Atlantic Ocean at the Bay mouth, respectively. Total I behaved conservatively (i.e., no evidence of consumption or production) during estuarine mixing during both cruises. In the southern Chesapeake Bay, total inorganic I was also approximately conservative. The primary process affecting the speciation of dissolved I was the conversion of IO3− to I−. In the James River estuary, there were indications of the conversion of both IO3− and I− to DOI. The concentrations of total I, IO3−, I− and DOI in James River water were 0.121, undetectable, 0.068 and 0.053 µM, respectively. These concentrations of total I and I− are significantly higher while that of IO3− is noticeably lower than those used presently for estimating global riverine input of these I species to the oceans. The riverine flux of DOI to the oceans is presently unknown.
Starting Page	257
Ending Page	263
Page Count	7
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	3
Issue Number	2
Journal	Journal of Environmental Monitoring
DOI	10.1039/b007229j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	James River Chesapeake Bay Atlantic Southern Chesapeake Bay Atlantic Ocean Bay Iodine Estuary Redox Reducing agent Salinity Speciation Treatment as prevention
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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