University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Iodate

  • IUPAC Name: iodate
  • Molecular Formula: IO3-1
  • InChI: InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4)/p-1
  • InChI Key: ICIWUVCWSCSTAQ-UHFFFAOYSA-M

@ ChemSpider@ NIST@ PubChem

Citations 13

"The Application Of Strongly Reducing Agents In Flow Injection Analysis. 1. Chromium(II) And Vanadium(II)"
Anal. Chim. Acta 1983 Volume 145, Issue 1 Pages 197-201
R. C. Schotohrst, J. M. Reijn, H. Poppe and G. Den Boef

Abstract: Many reagenst cannot easily be applied in quantitative analysis, because of their instability under atmospheric conditions. When such reagents are prepared in a flowing stream, their applicability is very promising; for example, in flow injection analysis, a reagent need be stable only for 20-30 s. The application of chromium(II) and vanadium(II) in flow injection analysis is described. Nitrate and nitrile can be determined in the concentration range 5 x 10^-5-5 x 10^-3. Calibration graphs show good linearity.
Spectrophotometry

"The Application Of Strongly Reducing Agents In Flow Injection Analysis. 2. Chromium(II)"
Anal. Chim. Acta 1983 Volume 153, Issue 1 Pages 133-139
R. C. Schothorst and G. den Boef

Abstract: Methyl red, o-nitrophenol, IO3-, Fe(CN)63-, UO22+, V(IV) and V(V) can be determined at down to 0.1 mM levels with the Cr(II) - EDTA reagent described in Part I (Anal. Abstr., 1983, 45, 1A8) by measuring the absorbance at 600 nm of the Cr(III) - EDTA produced. Polarographic detection at -1.5 V at a static mercury-drop electrode of the Cr(III) - EDTA resulting from the reduction of NO3- and NO2- affords detection limits for these anions better by factors of 3 and 10, respectively, than with the aforementioned spectrophotometric method.
Spectrophotometry Electrode Polarography

"The Application Of Strongly Reducing Agents In Flow Injection Analysis. 3. Vanadium(II)"
Anal. Chim. Acta 1984 Volume 161, Issue 1 Pages 27-35
R. C. Schothorst, J. J. F. van Veen and G. den Boef

Abstract: This study parallels that of Part II (cf. Anal. Abstr., 1984, 46, 5A6), in which Cr(II) - EDTA was used as reducing agent. Vanadyl sulfate, NH4VO3, K3Fe(CN)6, KIO3, methyl red, uranyl acetate and 2-nitrophenol were determined with spectrophotometric detection at 350 nm, based on the decrease in absorption of the V(II) - EDTA complex. Limits of detection (analyte concentration. for which the absorbance change is 10 times the peak-to-peak noise) range from 0.17 mM to 49 µM. Nitrate, NO2- and NH2OH were determined in alkaline medium with amperometric detection; limits of detection ranged from 15 to 150 µM. Hydrazine was determined at pH 5.7 with amperometric detection (detection limit 95 µM). By using an NH3-detection device coupled to the reduction system, conversions of NO3-, NO2- and NH2OH into NH3 were 26, 54 and 47%, respectively.
Amperometry Spectrophotometry

"Spectrophotometric Determination Of Iodate, Iodide And Acids By Flow Injection Analysis"
Anal. Chim. Acta 1986 Volume 179, Issue 1 Pages 475-479
O. F. Kamson

Abstract: Iodine is liberated by the reaction of IO3- and I- in acidic solution and determined at 350 nm. The sample is injected into a carrier stream containing the other two species. For IO3- the response is rectilinear between 10 and 60 µM with a coefficient of variation at 40 µM of 3.0% (n = 4). For I- the rectilinear range is 2 to 8 mM and the coefficient of variation at 6 mM is 3.5% (n = 5). For H2SO4 the range is 0.4 to 0.8 mM with a coefficient of variation of 1% at 0.5 mM (n = 10). Both HNO3 and HCl can be determined by using a single graph from 0.3 to 5 mM.
Spectrophotometry

"The Application Of Strongly Reducing Agents In Flow Injection Analysis. 6. Molybdenum(III)"
Anal. Chim. Acta 1987 Volume 200, Issue 1 Pages 533-538
W. Th. Kok, D. T. Thuy, T. V. Nghi and G. Den Boef

Abstract: A stream of Mo(VI) solution was fed at 0.75 mL min-1 through a Jones reductor column (15 cm x 4 mm) of amalgamated Zn particles, prepared by stirring Zn with HgCl2 in 0.5 M H2SO4. The Mo(III) produced online was merged with a carrier stream (0.75 mL min-1) containing the injected sample, and the mixture was fed through a single-bead-string reactor packed with 0.6-mm glass beads before spectrophotometric detection. The decrease in the Mo(III) absorbance at 360 nm was measured. A sample throughput of 3 min-1 was achieved for IO3-, U(VI), V(V) and NO2-. The detection limits were ~0.1 mM. The amperometric detection, at a potential of -0.15 V, of NO2- is also described. The Mo(III) was a more selective reducing agent than U(III).
Amperometry Glass beads Jones reductor Reduction column Single bead string reactor

"Flow Injection Procedures For Determination Of Iodide And Iodate - Iodide With Spectrofluorimetric And Spectrophotometric Detection, Respectively"
Anal. Chim. Acta 1991 Volume 248, Issue 1 Pages 219-224
M. Yaqoob and M. Masoom, A. Townshend

Abstract: For the determination of iodide, sample solution was mixed with 5 mM Ce2SO4 and 0.01 M arsenious acid (0.8 mL min-1) in a mixing coil. The I- catalyzed reduction of Ce(IV) to fluorescent Ce(III) by As(III) was monitored at 350 nm (excitation at 260 nm). The calibration graph was rectilinear from 10 to 30 µM of I- and the detection limit was 0.5 µM. Azide ions interfered. For the determination of IO3-, the sample was injected into 0.3% p-aminophenol solution - 0.5 M acetate buffer (1:1; 0.43 mL min-1) and fed to a 300 cm mixing coil. The resulting indamine dye was detected at 540 nm. The calibration graph was rectilinear from 0.5 to 1.3 nM IO3- and the detection limit was 5 µM. The sampling rate was 25 hr-1 and the coefficient of variation was 1.5% for 0.5 mM IO3- (n = 10). A similar method was used to determine I-, which was oxidized to IO3- by 2.0 M H2O2 in the presence of 0.05% p-aminophenol (4:1). The detection limit was 50 µM of IO3- and the coefficient of variation was 0.8%; sample throughput was 30 h-1.
Fluorescence Spectrophotometry Catalysis Interferences

"Iodimetric Determination Of Iodate, Bromate, Hypochlorite, Ascorbic Acid And Thiourea Using Flow Injection Amperometry"
Analyst 1989 Volume 114, Issue 5 Pages 583-586
Mohamed A. Abdalla and Hassan M. Al-Swaidan

Abstract: Iodate, bromate and hypochlorite were determined as iodine by flow injection amperometry at a platinum or glassy carbon electrode by injecting them into an eluent 0.20 M in hydrochloric acid and 0.024 M in potassium iodide or an eluent 2 M in sulphuric acid and 0.12 M in potassium iodide. The rectilinearity range is from 10^-3 to 10^-7M. Organic compounds that can be oxidized or iodinated by iodine were determined on-line by injecting them in acidic solution into an iodate-iodide eluent and observing the decrease in the iodine signal. The determination was also performed by injecting a pre-reacted solution of iodine and the organic compound and monitoring the excess of iodine.
Amperometry

"Microchemical Determination Of Iodate And Iodide In Sea-waters By Flow Injection Analysis"
Microchim. Acta 1993 Volume 110, Issue 1-3 Pages 71-77
Koichi Oguma, Kazuyuki Kitada and Rokuro Kuroda

Abstract: Filtered seawater samples were diluted to a salinity of 1.2%. The total inorganic iodine (i.e. IO3- and I-) was determined by injecting the diluted samples (128 µL) into a carrier stream of aqueous 2% NaCl. The sample stream was merged with a flow of 50 mM ammonium ferric sulfate solution in 4.6 M HNO3. The stream then merged with a stream of 2.4 mM KSCN - 1.5 mM NaNO2 before passing through a reaction column at 50°C. The absorbance of the column effluent was monitored at 460 nm. Determination of IO3- was effected by passing the sample carrier stream through a Bio-Rad AG1-X4 anion-exchange resin column (10 cm x 0.5 mm) to remove I- before repeating the above procedure. Recoveries were >97% and the coefficient of variation was 1.3%. The method was applied to seawater samples with a total iodine content ranging from 0.75 to 150 ng mL-1. Results are presented.
Sea Spectrophotometry Resin Biorad

"Determination Of Iodate By Flow Injection Analysis With 5-Br-PADAP [2-(5-bromo-2-pyridylazo)-5-diethylamino-o-phenol] And Thiocyanate"
Microchim. Acta 1991 Volume 103, Issue 5-6 Pages 279-283
Xingguo Chen, Xinwei Zhao, Zongyan Kou and Zhide Hu

Abstract: Sample (100 µL) was merged with 0.01 M KSCN solution and 0.4 mM 5-Br-PADAP ethanolic solution in 1.2 M H2SO4 (both at 0.8 mL min-1). After reaction the red-violet triatomic ion associate formed was measured at 550 nm. Beer's law was obeyed from 2 to 20 µM-IO-3. The method was applied to the analysis of kelp. The detection limit was 0.6 µM and recovery was >97%. Sample throughput was 84 h-1; BrO3- and IO4- interfered.
Plant Spectrophotometry Interferences

"Ion Chromatography Of Inorganic Anions With Potentiometric Detection Using A Metallic Copper Electrode"
J. Chromatogr. A 1985 Volume 321, Issue 1 Pages 363-374
P. R. Haddad andP. W. Alexander, M. Trojanowicz

Abstract: The determination of inorganic anions by ion chromatography with potentiometric detection using a metallic copper indicator electrode is described. The electrode response to inorganic anions can result from consumption of cuprous and cupric ions in the diffusion layer at the electrode surface, from production of copper ions due to oxidation of metallic copper, or as a result of displacement of a copper-complexing ligand from the eluent by an eluted non-complexing inorganic anion. The first possibility is exemplified by the determination of cyanide, chloride, bromide, iodide and thiocyanate, whereas the second possibility is illustrated by the determination of iodate, bromate and chlorate. An example of the indirect detection method is the determination of nitrite, nitrate and sulphate, using sodium tartrate as eluent. Calibration data for all of the above detection methods are provided and are interpreted in terms of theoretical response equations. Detection limits are also presented and are shown to be strongly dependent on the chromatographic conditions used and on the electrode response mechanism applicable to each anion.
HPIC Electrode Electrode Potentiometry

"Selective Determination Of Iodide And Iodate In Brine Waters By Atmospheric Pressure Helium Microwave-induced Plasma Atomic-emission Spectrometry With Continuous-flow Generation Of Volatile Iodine"
Chem. Express 1991 Volume 6, Issue 1 Pages 5-8
Nakahara, T.;Yamada, S.;Wasa, T.

Abstract: A method is described for the determination of iodide and iodate in brine by atmospheric pressure helium microwave-induced plasma AES. The method is based on the continuous evolution of volatile iodine by oxidation of iodide with sodium nitrate. Differentiation of iodide and iodate is achieved by pre-reduction of iodate to iodide with ascorbic acid. The detection limit is 2.3 ng mL-1 of iodine. Recoveries of added iodine were 94.2 to 103. 5%.
Environmental Water Spectrophotometry Selectivity

"Detection Of Oxidizing Agents With Chemiluminescence Method Using Ruthenium Complex"
Chromatography 1998 Volume 19, Issue 4 Pages 340-341
Yokota, K.;Saito, K.;Murakami, S.;Muromatsu, A.;Yamazaki, S.

Abstract: A post-column reaction system for determination of oxidizing agents such as bromate and iodate was developed. It is based on the chemiluminescent reaction of tris(2,2'-bipyridine) ruthenium(III) with oxalic acid which is produced by oxidation of tartaric acid with oxidizing agents in a PTFE reaction coil under UV irradn. The relative standard deviation for bromate obtained by FIA was 4.8% (n = 7) at 125 pmol/20 µL. The detection limit for bromate obtained by FIA was 19.8 pmol at a signal-to-noise ratio of 3.
Chemiluminescence HPLC Post-column derivatization UV reactor Photochemistry

"Iodimetric Flow Injection Determination Of Traces Of Oxidants. 1. Determination Of Iodate And Active Chlorine"
Quim. Anal. 1987 Volume 6, Issue 1 Pages 60-67
Hernandez Mendez, J.;Alonso Mateos, A.;Almendral Parra, M.J.;Garcia De Maria, C.

Abstract: To determine IO3-, the sample solution (0.1 to 12 µg mL-1; 126 µL) is injected into a carrier stream (3.3 mL min-1) of water and this stream merges with one (3.0 mL min-1) of 0.04 M KI in 0.02 M H2SO4. The mixture passes through a knotted 40-cm reaction coil to a 30 µL flow cell, where the absorbance is measured at 350 nm. For active Cl, the solution (0.2 to 7 µg mL-1; 126 µL) is injected into a carrier solution (3.0 mL min-1) of pH 3.5 to 10.0, which merges with a stream (3.0 mL min-1) of 0.04 M KI. The determination is completed as before. The coefficient of variation for IO3- or active Cl (0.5 µg mL-1) was 2.5% (n = 10 in each instance). The method for Cl was applied to water samples.
Environmental Spectrophotometry Indirect Knotted reactor