Determination of total iodine and iodate in sea water and in various evaporites

Schnepfe, Marian M.

doi:10.1016/s0003-2670(00)86856-7

Cited by 31 publications

(3 citation statements)

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“…The production of I 2 through the redox chemical reaction between IO 3 – and NO 2 – in frozen solution may make a significant contribution to the global iodine budget because both IO 3 – and NO 2 – are ubiquitous. The concentrations of NO 2 – and IO 3 – vary significantly depending on region, season, and type of environmental media (e.g., NO 2 – : dozens of nM ∼ a few μM in snow on the Arctic region, , hundreds of nM ∼ a few μM in seawater, , and a few μM ∼ hundreds of μM in surface water , and IO 3 – : dozens of nM ∼ hundreds of nM in sea ice on the Arctic region, hundreds of nM in seawater, − and dozens of nM ∼ hundreds of nM in surface water , ). Although the concentrations of IO 3 – and NO 2 – in this study are higher than environmentally relevant concentrations, the proposed mechanism can significantly affect the global production of I 2 because it operates in extensive cold regions, such as polar regions, permafrost, and midlatitudes during the winter season.…”

Section: Results and Discussionmentioning

confidence: 99%

Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution

Kim

et al. 2019

Environ. Sci. Technol.

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A new mechanism for the abiotic production of molecular iodine (I2) from iodate (IO3 –), which is the most abundant iodine species, in dark conditions was identified and investigated. The production of I2 in aqueous solution containing IO3 – and nitrite (NO2 –) at 25 °C was negligible. However, the redox chemical reaction between IO3 – and NO2 – rapidly proceeded in frozen solution at −20 °C, which resulted in the production of I2, I–, and NO3 –. The rapid redox chemical reaction between IO3 – and NO2 – in frozen solution is ascribed to the accumulation of IO3 –, NO2 –, and protons in the liquid regions between ice crystals during freezing (freeze concentration effect). This freeze concentration effect was verified by confocal Raman microscopy for the solute concentration and UV–visible absorption spectroscopy with cresol red (acid–base indicator) for the proton concentration. The freezing-induced production of I2 in the presence of IO3 – and NO2 – was observed under various conditions, which suggests this abiotic process for I2 production is not restricted to a specific region and occurs in many cold regions. NO2 –-induced activation of IO3 – to I2 in frozen solution may help explain why the measured values of iodine are larger than the modeled values in some polar areas.

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Section: Results and Discussionmentioning

confidence: 99%

Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution

Kim

et al. 2019

Environ. Sci. Technol.

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“…The results obtained by radiochemical neutron-activation analysis also show good agreement for bottles of mineral water from the same batch (Radenska, King's Spring; Roga~ka, Donat), when the second analysis was done a year after the first. The reason for [23][24][25]. Because of the practically constant value for iodine in sea-water, and the lack of standard reference materials for iodine in an aqueous matrix, water samples from the open sea can serve as a reference or "certified" material for validation of results for iodine in analysis of various water samples.…”

Section: Resultsmentioning

confidence: 99%

Iodine in mineral waters: A comparison of results from two analytical techniques

et al. 1991

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Abstract.A comparative study of the determination of iodine in mineral waters is presented. Iodine was first determined by a standard titrimetric method and the results obtained were compared with those obtained by the faster and more sensitive radiochemical neutron activation method. For a series of waters, the results obtained by the two techniques were in fair agreement for the higher concentration levels of iodine, but for very low iodine levels the titrimetric method was insufficiently sensitive. The RNAA procedure was checked by standard addition experiments, and shown to be also valid when iodine was present as iodate.Key words: iodine, mineral waters, titrimetry, radiochemical neutron activation analysis.Underground waters with a higher content of dissolved mineral substances or compounds (> 1 g/l) and gases (> 250 mg/1) and with natural biological purity are classified as mineral waters [1,2]. The utilization of mineral waters for drinking and medico-balneological purposes necessitates reliable quantitative data on their essential micro-constituents, including iodine.Correlations between endemic goitre and iodine deficiency date from the last century. Clinical research on this phenomenon in different parts of the world also shows a good correlation between goitre and the iodine content of drinking waters. The frequency of its incidence is higher in areas where the iodine content in drinking waters is less than 3 #g/l, and iodination of the water considerably reduces this effect /-3, 4]. In comparison with normal ground and surface waters, mineral waters are usually enriched with iodine, though this can depend on the geological structure of

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“…-44- Thompson, 1960a, 1960b;Matthews and Riley, 1970;Wong and Brewer, 1974;Truesdale and Spencer, 1974), photometry (Reith, 1930;Dubravcic, 1955;Sugawara et al, 1955;Voipio, 1961;Kappanna et al, 1962;Tsunogai, 1971a;Schnepfe, 1972;Truesdale and Spencer, 1974) and polarography Branica, 1968, 1969;Herring and Liss, 1973). The titrimetric methods involve the titration of liberated iodine using the starch-iodine or the triiodide ion color as the end point indicator.…”

Section: Iodine In the Atmospherementioning

confidence: 99%

Dissolved inorganic and particulate iodine in the oceans

Wong¹

1976

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Determination of total iodine and iodate in sea water and in various evaporites

Cited by 31 publications

References 10 publications

Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution

Nitrite-Induced Activation of Iodate into Molecular Iodine in Frozen Solution

Iodine in mineral waters: A comparison of results from two analytical techniques

Dissolved inorganic and particulate iodine in the oceans

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