Simultaneous determination of chromium(III) and chromium(VI) by ion chromatography with inductively coupled plasma mass spectrometry

Inoue, Yasuhiro; Sakai, T.; Kumagai, Hiroo

doi:10.1016/0021-9673(95)00125-7

Cited by 90 publications

(50 citation statements)

References 27 publications

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“…The negative ionization mode [28 -30] was applied since the metal -EDTA complexes were negatively charged. In addition, ESI-MS was used to determine whether metal -EDTA complexes were stable in solution since kinetic stability without intercomplex exchange during chromatographic separation is a requirement for IC separation [31]. A 5 mM ammonium acetate (pH 7.0) eluent was used because of its compatibility with ESI.…”

Section: Confirmation Of Metal -Edta Complexes By Esi-msmentioning

confidence: 99%

Speciation of metal–EDTA complexes by flow injection analysis with electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry

Chen¹,

Sun

et al. 2008

J of Separation Science

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Original PaperSpeciation of metal-EDTA complexes by flow injection analysis with electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry Flow injection analysis (FIA) with ESI-MS and ion chromatography (IC) with inductively coupled plasma-MS (ICP-MS) and their MS spectral showed that these metal -EDTA complexes were present in solution. Based on the ESI-MS, ion chromatographic separation and ICP-MS detection of these complexes are possible because IC-ICP-MS requires stable metal -EDTA complex during the chromatographic separation. The separation of these metal -EDTA complexes was achieved on an anion-exchange column with a mobile phase containing 30 mM NH 4 (HPO 4 ) 2 at pH 7.5 within 7 min with ICP-MS providing element specific detection. The ICP-MS LODs for the metal -EDTA were in the range of 0.1 -0.5 lg/L with the exception of Fe (15 lg/L). The proposed method was a simple procedure for sample processing, using direct injection of sample without removal of sample matrix and was successfully applied to the determination of metal -EDTA complexes in real samples. IntroductionEDTA is a chelating agent which has the potential to perturb the natural speciation of metals, to influence metal bioavailability [1], and to remobilize metals from sediments and aquifers [2]. Chelating agents occur in natural waters predominantly as metal complexes. There are many studies emphasizing the importance of chelation on metal bioavailability, plant uptake, toxicity, transport, adsorption, distribution, and fate [3]. However, the identification and detection of these metal complexes in environmental sample is still a significant analytical challenge because of their structural similarities and presence at low concentrations in environmental matrices [4]. Separation of these complexes is therefore an important step in the development of an analytical method suitable for the detection of metal -EDTA complexes in environmental samples.CE and ion chromatography (IC) are the main separation methods used for the determination of metal -aminopolycarboxylic complexes. Using the CE approach, metal complexes with nitrilotriacetic acid (NTA), hydroxyethylethylenediaminetriacetic acid (HEDTA), EDTA, and diethylenetriaminepentaacetic acid (DTPA) were all successfully separated using either CZE [5 -7] or MEKC [8] with UV detection. LODs of 2 -500 lM were obtained using these CE methods, which are usually not sensitive enough for the analysis of trace levels of these complexes in environmental samples. As an alternative to CE, IC is often used to determine metal -EDTA complexes, based on the precolumn complexation of the chelating agents with metals. The separation of these complexes by ionpairing [9 -12] and ion-exchange chromatography [13 -15] has been accomplished with conductivity or UV/Visible detection, but these detectors are nonselective and it is therefore often impossible to identify all metal -EDTA complexes in complex matrices. To address these problems, the separation...

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Section: Confirmation Of Metal -Edta Complexes By Esi-msmentioning

confidence: 99%

Speciation of metal–EDTA complexes by flow injection analysis with electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry

Chen¹,

Sun

et al. 2008

J of Separation Science

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“…Therefore, the development of an analytical method for Cr(VI) at the trace level is a matter of great interest in analytical chemistry. 1,2 Many sensitive analytical methods have been reported based on spectroscopic instrumentation, such as atomic absorption spectroscopy and inductive coupled plasma mass spectrometry (ICP-MS), [3][4][5] but these methods require time-consuming sampling steps and highcost equipment. Electrochemical stripping analysis has always been recognized as being a powerful tool for measuring trace metals in environmental samples.…”

Section: Introductionmentioning

confidence: 99%

Anodic Stripping Voltammetry for the Determination of Trace Cr(VI) with Graphite/Styrene-Acrylonitrile Copolymer Composite Electrodes

et al. 2017

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Although the addition of complexing agents is not necessary for ASV determination, so far only a few studies have been reported, probably due to the poor sensitivity and precision. Nevertheless, the oxidative stripping peak of Cr(VI) located in a more positive potential region that has much less interference by some heavy 2017 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. A square-wave anodic stripping voltammetry (SWASV) for the determination of trace amounts of hexavalent chromium Cr(VI) at a graphite/styrene-acrylonitrile (Graphite-SAN) copolymer composite electrode is described. This method involves a preconcentration step whereby the trace Cr(VI) was cathodically reduced to Cr(III) on an electrode surface in an acetate buffer (pH 5), followed by an anodic stripping technique with a square-wave voltammetric mode. It has been shown that the analytical sensitivity is significantly improved at the Graphite-SAN copolymer composite electrode in comparison with the conventional glassy carbon electrode, due to the strong interaction between Cr(III) and the nitrile end group of the SAN copolymer. The SWASV response was characterized with respect to the pH, deposition potential, possible interferences, etc. Under the optimal conditions, the stripping peak height linearly increased with the concentration of Cr(VI) in a range from 0 to 150 ng mL -1 with a correlation coefficient of 0.997, and a detection limit of 4.2 ng mL -1was achieved based on signal-to-noise ratio of about 3. The Graphite-SAN composite electrode exhibited some interesting advantages, such as high mechanical rigid, easy surface renewable, higher sensitivity and better peak resolution in comparison with the results at conventional glassy carbon electrodes. They have been applied to the determination of Cr(VI) in real water samples with satisfactory recoveries.

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“…For the separation of Cr(VI) and Cr(III), mainly solvent extraction, 14 coprecipitation, 15 ion-exchange separation, 16 adsorption on iminodiacetic chelate resins 8,9 and on active alumina 5,10 and electrodeposition 17 are mainly used. Ion chromatography and high-performance liquid chromatography of Cr(VI) and Cr(III) are included in the following techniques: (1) separation of Cr(VI) by an anion-exchange resin and separation of Cr(III) by cation-exchange resins; (2) complexation of Cr(III) with EDTA is used, and this reaction causes formation of the [Cr(III)-EDTA] -anion species.…”

mentioning

confidence: 99%

Simultaneous Determinations of Cr(VI) and Cr(III) by Ion-Exclusion/Cation-Exchange Chromatography with an Unmodified Silica-Gel Column

et al. 2010

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Simultaneous determination of chromium(III) and chromium(VI) by ion chromatography with inductively coupled plasma mass spectrometry

Cited by 90 publications

References 27 publications

Speciation of metal–EDTA complexes by flow injection analysis with electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry

Speciation of metal–EDTA complexes by flow injection analysis with electrospray ionization mass spectrometry and ion chromatography with inductively coupled plasma mass spectrometry

Anodic Stripping Voltammetry for the Determination of Trace Cr(VI) with Graphite/Styrene-Acrylonitrile Copolymer Composite Electrodes

Simultaneous Determinations of Cr(VI) and Cr(III) by Ion-Exclusion/Cation-Exchange Chromatography with an Unmodified Silica-Gel Column

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