Effects of flow rate and pretreatment on the extraction of trace metals from estuarine and coastal seawater by Chelex-100

Paulson, Anthony J.

doi:10.1021/ac00292a044

Cited by 78 publications

(34 citation statements)

References 17 publications

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“…Among the commercially available chelation-exchange substrates, iminodiacetate-based resins, such as Chelex-100, Muromac-A1, and Dowex A-1, have become the best-characterized in terms of their applications (Ebdon et al, 1991). Although iminodiacetate-based resin separation can provide greater preconcentration than those of the other methods, its extraction efficiency is highly susceptible to the salt matrix of biological samples (Huang, Yang, & Shih, 1997); the leaching of metal impurities contained in Chelex-100 is a major contributor to the blank level (Paulson, 1988;Guéguen, Dominik, & Perret, 2001). In addition, the NH 4 OAc solution used for buffering and column conditioning is also a potential contamination source (Paulson, 1988).…”

Section: In Vivo Monitoring Of the Transfer Kineticsmentioning

confidence: 99%

“…Although iminodiacetate-based resin separation can provide greater preconcentration than those of the other methods, its extraction efficiency is highly susceptible to the salt matrix of biological samples (Huang, Yang, & Shih, 1997); the leaching of metal impurities contained in Chelex-100 is a major contributor to the blank level (Paulson, 1988;Guéguen, Dominik, & Perret, 2001). In addition, the NH 4 OAc solution used for buffering and column conditioning is also a potential contamination source (Paulson, 1988). Because of these drawbacks, until recently, there have been no reports that described the use of FI on-line solid-phase chelation (column with iminodiacetate resin) to separate trace elements from microsamples (e.g., microdialysis samples).…”

Section: In Vivo Monitoring Of the Transfer Kineticsmentioning

confidence: 99%

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In vivomonitoring of the transfer kinetics of trace elements in animal brains with hyphenated inductively coupled plasma mass spectrometry techniques

Su¹,

Sun²,

Tzeng³

et al. 2009

Mass Spectrom. Rev.

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The roles of metal ions to sustain normal function and to cause dysfunction of neurological systems have been confirmed by various studies. However, because of the lack of adequate analytical method to monitor the transfer kinetics of metal ions in the brain of a living animal, research on the physiopathological roles of metal ions in the CNS remains in its early stages and more analytical efforts are still needed. To explicitly model the possible links between metal ions and physiopathological alterations, it is essential to develop in vivo monitoring techniques that can bridge the gap between metalloneurochemistry and neurophysiopathology. Although inductively coupled plasma mass spectrometry (ICP-MS) is a very powerful technique for multiple trace element analyses, when dealing with chemically complex microdialysis samples, the detection capability is largely limited by instrumental sensitivity, selectivity, and contamination that arise from the experimental procedure. As a result, in recent years several high efficient and clean on-line sample pretreatment systems have been developed and combined with microdialysis and ICP-MS for the continuous and in vivo determination of the concentration-time profiles of metal ions in the extracellular space of rat brain. This article reviews the research relevant to the development of analytical techniques for the in vivo determination of dynamic variation in the concentration levels of metal ions in a living animal.

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Section: In Vivo Monitoring Of the Transfer Kineticsmentioning

confidence: 99%

Section: In Vivo Monitoring Of the Transfer Kineticsmentioning

confidence: 99%

In vivomonitoring of the transfer kinetics of trace elements in animal brains with hyphenated inductively coupled plasma mass spectrometry techniques

Su¹,

Sun²,

Tzeng³

et al. 2009

Mass Spectrom. Rev.

View full text Add to dashboard Cite

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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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“…The pH value, measured according to Butler et al (1985), Dickson (1993a,b), and Millero et al (1993), of each seawater sample was adjusted to 6.0 with CH 3 COONH 4 , as described by Mö ller et al (1992). The sample was loaded into an 8-cm long column filled with CHELEX-100, which had been previously cleaned and conditioned according to Paulson (1986). YREEs were eluted with 5 ml of HNO 3 3.5 M, yielding a 400-fold enrichment factor.…”

Section: Seawater Analysismentioning

confidence: 99%

“…YREEs were eluted with 5 ml of HNO 3 3.5 M, yielding a 400-fold enrichment factor. Details of the procedures are reported in Paulson (1986) and Mö ller et al (1992). Briefly, pH values in studied seawater samples were measured by a potentiometric method based on sequential measurements of the electromagnetic force of a cell, both in a buffer solution of defined pH and in the seawater sample, and referred to the total pH scale.…”

Section: Seawater Analysismentioning

confidence: 99%

Alteration effects of volcanic ash in seawater: Anomalous Y/Ho ratios in coastal waters of the Central Mediterranean sea

Censi

Sprovieri

Larocca

et al. 2007

Geochimica et Cosmochimica Acta

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This paper presents the results of a study based on data collected during the oceanographic cruise ANSIC 2001 carried out in the Ionian Sea during the explosive activity of Mount Etna in the summer of 2001. Anomalous low values of Y/Ho ratios in seawater suggest extensive scavenging processes on the surfaces of smectitic alteration products, with Y and Ho fractionation controlled by the differences in their electronic configurations and behaviour during solution/surface complexation equilibria. These processes can also be traced through the presence of significant tetrad effects recorded in the chondrite-normalised Rare Earth Elements and Yttrium (YREEs) patterns of suspended particulate matter. This suggests that the preferential Y scavenging from seawater is due to the formation of inner-sphere complexes with OH À groups on montmorillonite crystal surfaces. The preliminary results of kinetic experiments of YREE released from volcanic ash to coexisting seawater, and the related effects on Y/Ho ratios and Ce anomalies, are consistent with the fractionation of Light Rare Earth Elements (LREEs) with respect to Heavy Rare Earth Elements (HREEs) observed in dissolved phase. They suggest a behaviour of Y similar to that reported for LREEs, particularly for Ce and Pr.

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Effects of flow rate and pretreatment on the extraction of trace metals from estuarine and coastal seawater by Chelex-100

Cited by 78 publications

References 17 publications

In vivomonitoring of the transfer kinetics of trace elements in animal brains with hyphenated inductively coupled plasma mass spectrometry techniques

In vivomonitoring of the transfer kinetics of trace elements in animal brains with hyphenated inductively coupled plasma mass spectrometry techniques

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

Alteration effects of volcanic ash in seawater: Anomalous Y/Ho ratios in coastal waters of the Central Mediterranean sea

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