Iodometry

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iodometry

[‚ī·ə′däm·ə·trē]
(analytical chemistry)
An application of iodine chemistry to oxidation-reduction titrations for the quantitative analysis in certain chemical compounds, in which iodine is used as a reductant and the iodine freed in the associated reaction is titrated, usually in neutral or slightly acid mediums with a standard solution of a reductant such as sodium thiosulfate or sodium arsenite; examples of chemicals analyzed are copper(III), gold(VI), arsenic(V), antimony(V), chlorine, and bromine.

Iodometry

 

a method used in the titrimetric analysis of substances exhibiting oxidizing or reducing properties based on the reversible reaction I2 + 2e ⇆ 2I. The I2/2I system, with a normal potential equal to +0.5345 V (25°C), is used for the determination of reducing agents with a potential lower than +0.5345 V (for example, stannous salts, hydrogen sulfide) and oxidizing agents with a potential greater than +0.5345 V (for example, peroxides, chromic and permanganic acids, cupric salts, and ferric salts). Solutions of iodine and sodium thiosulfate are used as standard solutions during titration, and starch serves as the indicator.

REFERENCE

Kreshkov, A. P. Osnovy analiticheskoi khimii, 3rd ed., part 2. Moscow, 1971.
References in periodicals archive ?
Other difficult found in the iodometric assay is susceptible to interference by molecular oxygen as well as the reaction of liberated iodine with other components in the systems [61].
Modification of iodometric determination of total and reactive sulfide in environmental samples.
Sulfide content in the zinc acetate trapping solution was determined by iodometric titration using a 1% starch indicator.
Treated uniforms in storage were monitored periodically for available chlorine by iodometric titration.
Ozone concentration was measured using an iodometric method (Stephens, 1984) and results were expressed as mg/L or ppm [O.
Analyses of hydrogen sulfide were made on samples from 0, 20, and 30 m depths using the iodometric procedure b described in Clesceri et al.
iodometric titration, resulting in a so-called iodine number, or expressed as C = C double bonds per 1,000 C-atoms;
An iodometric determination of the concentration of Copper(II) and Iron(III) in a technological solution, required a high degree of accuracy in several volumetric techniques.
Once a week influent and effluent samples were taken from the filters and effluents of the CW for evaluating the pH; BOD, by the iodometric method; COD, by the open reflux method; and total solids (TS) and total suspended solids (TSS), by the gravimetric method (APHA; AWWA; WEF, 2005).
Antibiotic resistance was determined by agar disc diffusion method using Mueller-Hinton agar according to Clinical and Laboratory Standards Institute recommendations and the production of b- lactamase was detected with the iodometric slide test.