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Titre du document / Document title

Speciation of iodide, iodine, and iodate in environmental matrixes by inductively coupled plasma atomic emission spectrometry using in situ chemical manipulation

Auteur(s) / Author(s)

ANDERSON K. A. (1) ; MARKOWSKI P. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) University of Idaho, Department of Food Science and Toxicology, Analytical Sciences Laboratory, Holm Research Center, Moscow, ID 83844-2201, ETATS-UNIS

Résumé / Abstract

Dissolved iodine, iodide, and iodate are determined in environmental matrixes by in situ chemical manipulation and inductively coupled plasma atomic emission spectrometry (ICPAES). The method uses equipment commonly available to most laboratories involved in environmental inorganic analysis. Total dissolved iodine, iodide, and iodate are determined by ICPAES using iodine vapor generation. Total iodine is determined directly by ICPAES after filtration. Total dissolved iodide (I-) is oxidized in situ to iodine by the addition of sodium nitrite in sulfuric acid in a simplified continuous flow manifold. Iodate is determined by prereduction at the instrument before analysis by the in situ oxidation ICPAES procedure. A standard nebulizer produces the gas-liquid separation of the total iodine, which is then quantified by ICPAES at 206.16 nm. The instrument detection limit for the iodine analysis was 0.04 μg/mL. Recoveries from seawater, saltwater, and freshwater standard reference materials ranged from 85 to 118% and averaged 98%. For samples containing both iodine and iodide, the total is determined with in situ oxidation, iodine is determined without the oxidizing reagents, and iodide is calculated from the difference. For samples containing all 3 species, pre-reduction is used and the iodine and iodide concentrations are subtracted for quantitation of iodate. The analysis is selective for these 3 species (I-, I2, and IO3-). A group of 20-30 samples may be analyzed and quantitated for all 3 individual, commonly occurring iodide species in less than 1 h. The procedure is considerably faster than any other reported techniques. This method is especially well-suited to the analysis of small environmental samples.

Revue / Journal Title

Journal of AOAC International    ISSN  1060-3271 

Source / Source

2000, vol. 83, no1, pp. 225-230 (20 ref.)

Langue / Language

Anglais

Editeur / Publisher

AOAC International, Gaithersburg, MD, ETATS-UNIS  (1992) (Revue)

Mots-clés anglais / English Keywords

Environmental control

;

Complex matrix

;

Experimental study

;

Emission spectrometry

;

Sample handling

;

Chemical modification

;

Iodides

;

Iodine

;

Iodates

;

Speciation

;

Water pollution

;

Chemical pollution

;

Inductive coupling plasma spectrometry

;

Chemical analysis

;

In situ

;

Mots-clés français / French Keywords

Contrôle milieu ambiant

;

Matrice complexe

;

Etude expérimentale

;

Spectrométrie émission

;

Manipulation échantillon

;

Modification chimique

;

Iodure

;

Iode

;

Iodate

;

Spéciation

;

Pollution eau

;

Pollution chimique

;

Spectrométrie ICP

;

Analyse chimique

;

In situ

;

Echantillon environement

;

Mots-clés espagnols / Spanish Keywords

Control medio ambiante

;

Matriz compleja

;

Estudio experimental

;

Espectrometría emisión

;

Manipulación muestra

;

Modificación química

;

Ioduro

;

Iodo

;

Iodato

;

Especiación

;

Contaminación agua

;

Polución química

;

Espectrometría ICP

;

Análisis químico

;

In situ

;

Localisation / Location

INIST-CNRS, Cote INIST : 3254, 35400008188436.0280

Nº notice refdoc (ud4) : 1263397



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