Use of Chelex resin for determination of labile trace metal fractions in aqueous ligand media and comparison of the method with anodic stripping voltammetry

Figura, Paul.; McDuffie, Bruce

doi:10.1021/ac50037a036

Cited by 156 publications

(59 citation statements)

References 33 publications

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“…It has been used by several researchers for preconcentration of trace metals [41,42,43,44]. Although the resin can exist as the hydrogen form (H-chelex) or the sodium form, its use in these forms is not very convenient for separation of trace metals from natural waters, because sodium is a major element in seawater, and can lead to spectral interference when ICP-AES is used for detection, and the hydrogen form has a pK a2 of 8.5 [45], so the metal ions which form complexes with the chelating group must be taken up at pH<8.5 to displace H + .…”

Section: Preparation Of Chelex-100mentioning

confidence: 99%

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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Section: Preparation Of Chelex-100mentioning

confidence: 99%

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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“…Voltammetric procedures, particularly anodic stripping voltammetry (Batley and Florence, 1976;Figura and McDuffie, 1979), are commonly used for this type of separation. Ion exchange (Figura and McDuffie, 1979) and dialysis (Hart and Davies, 1977) are alternative procedures that may be used independently or in combination with each other to separate labile metal fractions.…”

Section: Partitioning Of Metals Among Different Phases General Characmentioning

confidence: 99%

Metal biogeochemistry in surface-water systems; a review of principles and concepts

Elder¹

1988

Circular

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“…The inorganic speciation of Cd in seawater has been studied by Branica et al [29], and Nelson and Mantoura [30] used pseudopolarograms to examine the complexation of Cu by the chloride ion. Figura and McDuffie [31,32] examined the complexation of Cu, Cd and Pb by NTA and EDTA, and Brown and Kowalski [33] studied the formation of Pb and Cd complexes with chloride and carbonate anions.…”

Section: Introductionmentioning

confidence: 99%

Determination of metal–organic complexation in natural waters by SWASV with pseudopolarograms

et al. 1995

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A novel electrochemical method is described for the examination of metal-organic complexation in natural waters. The technique is based upon the comparison of square wave anodic stripping voltammetry (SWASV) 'pseudopolarograms' (current vs. deposition potential plots) for natural samples with those obtained for metal complexation with selected 'model' binding ligands at constant ionic strength. For electrochemically active zinc species in seawater, the pseudopolarogram approach allowed the estimation of thermodynamic stability constants (KML) within a stability constant window of approximately 104-106 M-' up to >lot5 M-'. For a natural rainwater sample, the pseudopolarogram indicated only one zinc class, probably a mixture of 'free' and/or inorganically complexed species. In an application to a coastal seawater sample, three species were identified: (1) weakly complexed, lo KznL = 4.14 f 0.92~-'; (2) moderately complexed, logKznL = 7.77 f 0 . 6 2~-' ; (3) strongly complexed, logKznL = 11.45 & 0 . 9 5~-. Results are compared to those obtained using complexometric titration with SWASV at a thin mercury film-glassy carbon rotating disk (TMF-GCRD) electrode. The latter detected a single strong complexing ligand (or

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Use of Chelex resin for determination of labile trace metal fractions in aqueous ligand media and comparison of the method with anodic stripping voltammetry

Cited by 156 publications

References 33 publications

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

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

Metal biogeochemistry in surface-water systems; a review of principles and concepts

Determination of metal–organic complexation in natural waters by SWASV with pseudopolarograms

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