Automated determination of vanadium(IV) and (V) in natural waters based on chelating resin separation and catalytic detection with Bindschedler’s green leuco base

Okamura, Kei; Sugiyama, Masahito; Obata, Hajime; Maruo, Masahiro; Nakayama, Eiichiro; Karatani, Hajime

doi:10.1016/s0003-2670(01)01190-4

Cited by 39 publications

(43 citation statements)

References 35 publications

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“…However, a healthier comment would be that a possible oxidation of V(IV) to V(V) at pH's higher than 3.0 is taking place, and is thus leading the sorbent to exhibit sorption only towards V(V). This finding is also in accordance with the results of the previous studies which report the oxidation of V(IV) to V(V) near neutral pHs [29,30]. It was also reported by Nukatsuka et al [29] that especially in seawater containing organic matter, there is the possibility of reduction of V(V) to V(IV) at pH 2.0 which dictates the immediate processing of samples if acidic pHs are to be used for speciation.…”

Section: Effect Of Phsupporting

confidence: 92%

“…This finding is also in accordance with the results of the previous studies which report the oxidation of V(IV) to V(V) near neutral pHs [29,30]. It was also reported by Nukatsuka et al [29] that especially in seawater containing organic matter, there is the possibility of reduction of V(V) to V(IV) at pH 2.0 which dictates the immediate processing of samples if acidic pHs are to be used for speciation. In a study by Ekinci and Köklü [37], a similar sorbent functionality was used for several metal ions including vanadium but no speciation results were given; and the sorbent used displayed maximum retention towards vanadium at pHs greater than 8.0.…”

Section: Effect Of Phsupporting

confidence: 92%

“…In acidified (pH 2.0) artificial seawater V(IV) → V(V) oxidation rate was slow. These results were reported to be in line with those obtained by Okamura et al [29]. In a recent study by Xiong et al [30], vanadium speciation was realized by means of a microcolumn packed with cetyltrimethylammonium bromide-modified alkyl silica.…”

Section: Introductionsupporting

confidence: 89%

“…This could be reflecting a strong interaction between the silica surface and the functional groups. Based on 29 Si and 13 C NMR data of 3-APTES modified silica, it was reported that a covalent bond forms between silylating agent (3-APTES) and silanol groups which are dispersed onto the silica surface [47]. The functional groups of 3-APTES modified silica were also identified using FTIR (figure not shown).…”

Section: Characterization Of the Sorbentmentioning

confidence: 99%

“…Still, a shaking time of 30 min was used to guarantee the quantitative sorption keeping in mind that this is a rather short period of time for V(V)→V(IV) reduction for which a half life of about 3 h was reported [29]. Although the relatively fast kinetics of the sorption recalled the use of the functionalized sorbent in micro/mini columns for SPE, the small diameter of the particles precluded this possibility due to the back-pressure created during the operation.…”

Section: Effect Of Sorbent Amount and Shaking Timementioning

confidence: 99%

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Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Erdem

Shahwan

Çağır

et al. 2011

Chemical Engineering Journal

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a b s t r a c tA solid phase extraction sorbent, aminopropyl triethoxysilane-functionalized silica was prepared and used for vanadium speciation prior to inductively coupled plasma mass spectrometric determination. The necessary sorption parameters such as sorption pH, reaction temperature, sorbent amount and sample volume were optimized. The sorption for V(V) and V(IV) under the optimized conditions was 98% (±1) and was lower than 10%, respectively. The sorption process was investigated both from a kinetic perspective and also in terms of Freundlich, Dubinin-Radushkevich and Langmuir isotherm models to characterize the uptake of vanadate ion by the functionalized silica. Desorption from the sorbent was realized with 0.5 mol L −1 thiourea prepared in 0.2 mol L −1 HCl. Among the possible interfering species tested, Te(IV), Se(IV), Se(VI) and Fe(III) showed interference effects with V(V) signal. The validity of the method was first checked via spike recovery experiments with four different types of water; namely ultra pure, bottled drinking, tap, and sea water for different concentrations of V(V). The percent recovery values changed between 87 and 108 for all water types. The accuracy of the proposed methodology was also checked by analyzing a standard reference material (NIST, SRM 1643e) and a good agreement was found between the determined and the certified value. The proposed methodology has also been shown to be applicable for the separate sorption of V(V) in the absence/presence of V(IV) and for the sorption of both V(IV) and V(V) in waters. The amount of V(IV) can then be determined from the difference.

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Section: Effect Of Phsupporting

confidence: 92%

Section: Effect Of Phsupporting

confidence: 92%

Section: Introductionsupporting

confidence: 89%

Section: Characterization Of the Sorbentmentioning

confidence: 99%

Section: Effect Of Sorbent Amount and Shaking Timementioning

confidence: 99%

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Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Erdem

Shahwan

Çağır

et al. 2011

Chemical Engineering Journal

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Determination of subnanomolar concentrations of vanadium in environmental water samples using flow injection with luminol chemiluminescence detection

et al. 2010

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A flow injection chemiluminescence method is described for the determination of subnanomolar concentrations of vanadium in environmental water samples. The procedure is based on the oxidation of luminol in the presence of dissolved oxygen catalyzed by vanadium(IV). Vanadium(V) reduction and preconcentration of vanadium(IV) was carried out using in-line silver reductor and 8-hydroxyquinoline chelating columns at pH 3.15, respectively. The calibration graph for vanadium(IV) was linear in the concentration range of 0.025-10 µg/L with relative standard deviation in the range of 0.4-5.58%. The detection limit (3s blank) was 3.8 × 10(-3) µg/L without preconcentration; when the vanadium(IV) was preconcentrated with an 8-HQ column for 1 min (2.0 mL of sample loaded), the detection limit of 5.1 × 10(-4) µg/L was achieved. One analytical cycle can be completed in 2.0 min. The analysis of certified reference materials (CASS-4, NASS-5 and SLRS-4) by the proposed method showed good agreement with the certified values. The method was successfully applied to the determination of total dissolved vanadium in environmental water samples.

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Determination of trace levels of dissolved vanadium in seawater by use of synthetic complexing agents and inductively coupled plasma-atomic emission spectroscopy (ICP-AES)

Abbasse

Ouddane

Fischer

2002

Analytical and Bioanalytical Chemistry

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In the determination of traces of dissolved vanadium in complex matrices such as seawater, separation and enrichment from the matrix is of special importance. A wide variety of methods has been proposed for preconcentration, depending to the nature of samples and the methods to be used for measurement. Among these methods separation techniques based on sorption on to chelating resins seem convenient, rapid, and capable of achieving a high concentration factor. The methods proposed in this paper are based on the transformation of all dissolved vanadium species in seawater into organic complexes by use of synthetic complexing agents such as dithizone, luminol, or 8-hydroxyquinoline; the resulting vanadium-organic complexes were sorbed on to a C(18) column at a flow rate of 5 mL min(-1). The vanadium sorbed on the C(18) columns was then stripped by use of nitric acid (2 mol L(-1)) and analysed by inductively coupled plasma-atomic emission spectroscopy, ICP-AES. This method was optimised and use of other chelating resins, such as chelamine, chelex-100, and immobilised 8-hydroxyquinoline and was compared by passing seawater samples directly over the resins. The experimental conditions (pH, acid used for elution, and contact time between the liquid sample and the resin) were optimised. The results were compared for all the resins used and were indicative of excellent and coherent reproducibility.

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Automated determination of vanadium(IV) and (V) in natural waters based on chelating resin separation and catalytic detection with Bindschedler’s green leuco base

Cited by 39 publications

References 35 publications

Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Determination of subnanomolar concentrations of vanadium in environmental water samples using flow injection with luminol chemiluminescence detection

Determination of trace levels of dissolved vanadium in seawater by use of synthetic complexing agents and inductively coupled plasma-atomic emission spectroscopy (ICP-AES)

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