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Redox Titration: Iodimetry and Iodometry01:23

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Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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Short-Term Iodine Dynamics in Soil Solution.

Olivier S Humphrey1,2, Scott D Young2, Neil M J Crout2

  • 1Inorganic Geochemistry, Centre for Environmental Geochemistry , British Geological Survey , Keyworth, Nottingham NG12 5GG , U.K.

Environmental Science & Technology
|January 11, 2020
PubMed
Summary
This summary is machine-generated.

Radioiodine (I) rapidly leaves soil solution, with short half-lives for both iodide and iodate forms. This rapid loss challenges phytofortification strategies by limiting nutrient availability to crops.

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Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Radiochemistry

Background:

  • Assessing iodine (I) reactions in soil is crucial for understanding radioiodine exposure and soil-to-crop transfer.
  • Limited methods have hindered the assessment of short-term iodine dynamics between soil solution and solid phases.

Purpose of the Study:

  • To investigate short-term (≤40 h) in situ fixation and speciation changes of radioiodine in soil solution.
  • To evaluate the dynamic interactions of iodine species in soil using microdialysis.

Main Methods:

  • Utilized microdialysis to passively extract soil solution spiked with radioiodine (129I- and 129IO3-).
  • Monitored in situ fixation and speciation changes over short time periods (≤40 h).

Main Results:

  • Observed greater instantaneous adsorption of 129IO3- compared to 129I- across all soils.
  • Complete reduction of 129IO3- to 129I- occurred within 5 hours.
  • Detected soluble organically bound iodine (org-129I) in low (0.5-5 kDa) and later in higher (12-18 kDa) molecular weight ranges.

Conclusions:

  • Radioiodine loss from soil solution is extremely rapid, with average half-lives of 4.06 h for 129I- and 10.03 h for 129IO3-.
  • The short window of iodine availability in soil solution poses significant challenges for phytofortification strategies in soil-based agriculture.