Speciation and preconcentration of vanadium(v) and vanadium(iv) in water samples by flow injection-inductively coupled plasma optical emission spectrometry and ultrasonic nebulization

Wuilloud, Rodolfo G.; Wuilloud, Jorgelina C. A. de; Olsina, Roberto A.; Martínez, Luis D.

doi:10.1039/b009705p

Cited by 52 publications

(39 citation statements)

References 30 publications

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“…For this purpose chelating resins 11-14 and several modified polymers [15][16][17] have usually been applied. Determination of vanadium at trace levels is important for monitoring pollution as well as for understanding its geochemical and biological effects.…”

Section: Introductionmentioning

confidence: 99%

“…13 Moreover, the whole preconcentration step was very slow (2 and 4 h for a batch and column procedure, respectively). Wuilloud et al 15 reported a sensitivity enhancement of 225 in determination of vanadium by ICP-OES after its preconcentration on an Amberlite XAD-7 resin as a vanadium-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol complex. However, the enrichment factor that resulted from the application of microcolumn was only 15.…”

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confidence: 99%

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Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Pyrzyńska

Wierzbicki

2005

ANAL. SCI.

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IntroductionFor the purpose of separation of metal ions, either for purification or preconcentration, various kinds of chelating resins have been developed. This has been the subject of numerous papers and reviews related to synthesis, characterization and metal ion uptake studies. [1][2][3][4] The insertion of suitable specific functional groups into solid matrices makes them capable of reacting with metal species under certain favorable conditions to form metal complexes. One of the most used supports is silica gel due to its good mechanical, thermal and chemical stability as well as excellent swelling resistance in different solvents. 4,5 Synthesis and application of silica gel phases loaded with various organic reagents for preconcentration of metal ions have been reviewed by Jal et al. 4 Additionally, several new reagents like dimethylglyoxime, 6 4-aminoantipyrene, 7 5-formyl-3-(1′-carboxyphenylazo) salicylic acid, 8 2-aminothiazol 9 and dendrimer-like polyamidoamine 10 have been recently reported for the chemical modification of silica surface.Unfortunately, the modified silica phases have not been studied for selective extraction and enrichment of vanadium. For this purpose chelating resins 11-14 and several modified polymers [15][16][17] have usually been applied. Determination of vanadium at trace levels is important for monitoring pollution as well as for understanding its geochemical and biological effects. However, when the level of this metal in real samples is very low, a preconcentration/separation step is necessary to improve the precision and accuracy.18 Moreover, the procedures based on sorption principles are very useful for separation of vanadium species as V(IV) and V(V), two main forms present in natural waters, which have different nutritional and toxic properties.In the present study, modified silica gel was used for the solid phase extraction of vanadium. Tetrakis(4-carboxyphenyl)-porphyrin (TCPP) was chosen as a complexing reagent as it forms stable complexes with vanadium. Vanadyl porphyrins occur for example in fossil fuels. 19 The silica surface was modified by physical adsorption and by direct chemical immobilization through formation of an amide bond. The resulting chelating sorbents have been studied for separation and preconcentration of vanadium species. Experimental Reagents and apparatusThe chemicals used were of analytical grade, and all solutions were prepared with deionized water obtained from a Milli-Q system (Millipore).A commercial atomic absorption standard solution (Merck) containing 1000 mg L -1 of V(IV) (VOSO4 in 0.5 mol L -1 H2SO4) was used. Vanadium(V) solutions were prepared by dissolving V2O5 in 1% (v/v) HNO3.5,10,15,20-Tetrakis(4-carboxyphenyl)porphyrin (TCPP) from Fluka was used without further purification.A Perkin Elmer Model AAnalyst 300 atomic absorption spectrometer equipped with a deuterium background correction system utilized the vanadium 318.5 nm line. HGA-800 furnace and pyrolytically coated graphite tubes were employed. The instrumental settings...

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Pyrzyńska

Wierzbicki

2005

ANAL. SCI.

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“…After the species have been separated by any of these techniques, they are quantified by UV [14,17], chemiluminescence [27], ICP [28], or ICPMS [14].…”

Section: Introductionmentioning

confidence: 99%

Determination of Vanadium (IV) and (V) in Southern Nevada Groundwater by Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry~!2009-12-24~!2010-02-10~!2010-05-11~!

Gamage¹,

Hodge²,

Cizdziel³

et al. 2010

TOCBMJ

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A rapid method is presented for measuring V(IV) and V(V) in groundwater, without preconcentration or complexing agents, using direct injection of the water samples (which were collected under an argon atmosphere) into an ion chromatograph-inductively coupled plasma mass spectrometer (ICPMS). The mobile phase is 1.5% v/v nitric acid, which minimizes the buildup of solids in the ultrasonic nebulizer, the torch, and on the entrance cones of the ICPMS -a problem with methods using organic complexing agents and inorganic salts. The result is much less instrument downtime for cleaning the affected parts. Limits of detection are 0.02 g L -1 for V(IV) and 0.06 g L -1 for V(V). The pentavalent form of vanadium represents 98% to 99% of the vanadium in these Southern Nevada groundwater samples and ranges from 3.7±0.1 g L -1 to 82.1±0.5 g L -1 . The remaining few percent is V(IV). Total vanadium was determined by ICPMS for a mass-balance comparison.

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“…10,11 Catalytic spectrophotometry 12-14 is a conventional method used for determination of vanadium with high sensitivity, but generally this kind of method can not distinguish the vanadium species. Recently, a solid phase extraction (SPE) and detection procedures for preconcentration and separation of trace analysis have been developed, using ionexchange resins, 15,16 chelating resins, 17,18 chelating functional group, 19 chelating agents, 20 and activated carbon, 21 coupled with fluorination assisted electrothermal vaporization (FETV)-ICP-OES, 15 FIA-ICP-OES, 16 ICP-AES, 19 electrothermal atomic absorption spectrometry (ETAAS) 22 and graphite furnace AAS. 18,21 However, many of these methods are expensive, timeconsuming, and reagent-consuming; they require skillful operators and must be performed in batchwise.…”

Section: Introductionmentioning

confidence: 99%

Flow Injection Analysis for Oxidation State Speciation of Vanadium(IV) and Vanadium(V) in Natural Water

2008

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A sensitive and simultaneous spectrophotometric flow injection method for the determination of vanadium(IV) and vanadium(V) is proposed. The method is based on the effect of ligands such as 2,4,6-tris(2-pyridyl)-1,3,5-triazine (TPTZ) and diphosphate on the conditional redox potential of iron(III)/iron(II) system. A four-channel flow system is assembled. In this flow system, diluted hydrochloric acid (1.0 × 10 -2 mol dm -3 ) as a carrier for standard/sample, acetate buffer (pH 5.5) as a carrier for diphosphate solution, an equimolar mixed solution of iron(III) and iron(II) and a TPTZ solution are delivered, so that the baseline absorbance can be established by forming a constant amount of iron(II)-TPTZ complex (λmax = 593 nm). Vanadium(IV) and/or vanadium(V) (400 μL) and diphosphate (200 μL) solutions are simultaneously introduced into the flow system; in this system the diphosphate solution passes through a delay coil. The potential of the iron(III)/iron(II) system increases in the presence of TPTZ, and therefore vanadium(IV) is easily oxidized by iron(III) to vanadium(V) to produce an iron(II)-TPTZ complex (a positive peak for vanadium(IV) appears). On the other hand, the potential of the redox system decreases in the presence of diphosphate, so that vanadium(V) can be easily reduced by iron(II) to vanadium(IV). In this case, the amount of iron(II) decreases according to the amount of vanadium(V). As a result, the produced iron(II)-TPTZ complex decreases (a negative peak for vanadium(V) appears). In this manner, two peaks for vanadium(IV) and vanadium(V) can be alternately obtained. The limits of detection (S/N = 3) are 1.98 × 10 -7 and 2.97 × 10 -7 mol dm -3 for vanadium(IV) and vanadium(V), respectivery. The method is applied to the simultaneous determination of vanadium(IV) and vanadium(V) in commercial bottled mineral water samples.

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Speciation and preconcentration of vanadium(v) and vanadium(iv) in water samples by flow injection-inductively coupled plasma optical emission spectrometry and ultrasonic nebulization

Cited by 52 publications

References 30 publications

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Determination of Vanadium (IV) and (V) in Southern Nevada Groundwater by Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry~!2009-12-24~!2010-02-10~!2010-05-11~!

Flow Injection Analysis for Oxidation State Speciation of Vanadium(IV) and Vanadium(V) in Natural Water

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