Investigation of A New Catalytic Reaction of Complex Formation of Cobalt (III) With Nitroso-R-Salt for the Determination of Microquantities of Phosphate-Ions

Mikhailova, L. I.; Pulyaeva, I. V.; Blank, A. B.

doi:10.1080/00032710008543177

Analytical Letters

2000

DOI: 10.1080/00032710008543177

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Investigation of A New Catalytic Reaction of Complex Formation of Cobalt (III) With Nitroso-R-Salt for the Determination of Microquantities of Phosphate-Ions

L. I. Mikhailova¹,

I. V. Pulyaeva²,

A. B. Blank³

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“…In this study, the authors reported the presence of bromine in some of the examined crystals (6). Mikhailova et al have reported the presence of phosphate-ion impurity in cesium iodide (7). Thus, there is not a single report in the literature on the determination of all the anionic impurities (i.e., F 2 , Cl 2 , Br 2 , NO 3 2 , PO 4…”

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Matrix Elimination Ion Chromatography Method for the Determination of Trace Levels of Anionic Impurities in High Purity Cesium Iodide

Ayushi

Kumar

Reddy

2011

Journal of Chromatographic Science

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In the present study an ion chromatographic method based on matrix elimination has been developed for the determination of anionic impurities in high purity cesium iodide crystals. The presence of impurities has a detrimental effect on the characteristics of detectors based on cesium iodide crystals. In particular, oxygen-containing anions inhibit the resolving power of scintillators and decrease the optical absorption. The quantitative determination of anions (fluoride, chloride, bromide, nitrate, phosphate, and sulphate) simultaneously in the high-purity cesium iodide crystals has not been carried out before. The large concentration of iodide poses a challenge in the determination of anions (especially phosphate and sulphate); hence, matrix elimination is accomplished by adopting a sample pretreatment technique. The method is validated for linearity, accuracy, and precision. The limit of detection for different anions is in the range of 0.3-3 µg/g, and the relative standard deviation is in the range of 4-6% for the overall method.

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confidence: 99%

Matrix Elimination Ion Chromatography Method for the Determination of Trace Levels of Anionic Impurities in High Purity Cesium Iodide

Ayushi

Kumar

Reddy

2011

Journal of Chromatographic Science

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“…The previously studied reactions of aluminum(III) with Xylenol Orange [3] (hereafter reaction (1)) and cobalt(III) with nitroso-R salt [4] (hereafter reaction (2)) were used for the selective determination C and P , respectively; masking of interfering anions was used. If masking agents are not used, the rate of reaction (1) depends not only on the concentration of carbonate ions, but also on the concentration of borate ions.…”

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Use of the mathematical apparatus of two-component spectrophotometry for the simultaneous catalymetric determination of two anions

2005

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Catalymetry belongs to nonspecific analytical methods; however, it can be used as a method for multicomponent analysis. It is expected that catalysts can be determined simultaneously based on the differences in the rates of catalytic reactions. This approach excludes separation, which makes an additional contribution to the error of the determination. Catalymetric multicomponent analysis based on the additive action of anions in complexation reactions is used rather rarely. The mathematical fundamentals of multicomponent kinetic analysis reported in the literature mostly deal with noncatalytic reactions [1]. There are only a few analytical applications of the method for the determination of metal catalysts in the presence of each other under the conditions when the sensitivity coefficients of the components are significantly (by 1-2 orders of magnitude) different [2].In this work, we demonstrate that the reproducible simultaneous catalymetric determination of two anions with similar sensitivity coefficients is possible with the use of the mathematical apparatus of two-component spectrophotometry. Taking into account the features of catalymetry, we developed an algorithm for two-component analysis and the processing of its results. The use of the optimality î test common in nonselective multicomponent spectrophotometry allows the selection of the conditions of the separate simultaneous determination of two anions with a permissible error.The previously studied reactions of aluminum(III) with Xylenol Orange [3] (hereafter reaction (1)) and cobalt(III) with nitroso-R salt [4] (hereafter reaction (2)) were used for the selective determination C and P , respectively; masking of interfering anions was used. If masking agents are not used, the rate of reaction (1) depends not only on the concentration of carbonate ions, but also on the concentration of borate ions. The rate of reaction (2) also depends on the con-O 3 2-O 4 3-centration of carbonate ions. This was the reason for examining the possibility of the simultaneous catalymetric determination of carbonate and borate ions by the reaction of aluminum(III) with Xylenol Orange and of carbonate and phosphate ions by the reaction of cobalt(III) with nitroso-R salt. In reaction (2), borate ions were masked with D -mannite.If the principle of the additivity of catalytic reaction rates is fulfilled, the equation relating the concentrations of the two anions with the analytical signal (total rate of the catalytic reaction v ) is as follows:(1)The known techniques for calculating concentrations in multicomponent systems are frequently based on the different versions of the least squares method [5,6].Calibration was performed by measuring the total rate of the catalytic reaction in the presence of the two anions at i different conditions under which the partial sensitivities ( k ) of ions are changed. Among the conditions of the reaction, the concentrations of the reagents, temperature, pH, etc., were varied. The values of k were determined with the use of calibration mixtur...

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Investigation of A New Catalytic Reaction of Complex Formation of Cobalt (III) With Nitroso-R-Salt for the Determination of Microquantities of Phosphate-Ions

Cited by 2 publications

References 1 publication

Matrix Elimination Ion Chromatography Method for the Determination of Trace Levels of Anionic Impurities in High Purity Cesium Iodide

Matrix Elimination Ion Chromatography Method for the Determination of Trace Levels of Anionic Impurities in High Purity Cesium Iodide

Use of the mathematical apparatus of two-component spectrophotometry for the simultaneous catalymetric determination of two anions

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