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Highly selective micro-sequential injection lab-on-valve (μSI-LOV) method for the determination of ultra-trace concentrations of nickel in saline matrices using detection by electrothermal atomic absorption spectrometry

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Abstract

A highly selective procedure is proposed for the determination of ultra-trace level concentrations of nickel in saline aqueous matrices exploiting a micro-sequential injection Lab-On-Valve (μSI-LOV) sample pretreatment protocol comprising bead injection separation/pre-concentration and detection by electrothermal atomic absorption spectrometry (ETAAS). Based on the dimethylglyoxime (DMG) reaction used for nickel analysis, the sample, as contained in a pH 9.0 buffer, is, after on-line merging with the chelating reagent, transported to a reaction coil attached to one of the external ports of the LOV to assure sufficient reaction time for the formation of Ni(DMG)2 chelate. The non-ionic coordination compound is then collected in a renewable micro-column packed with a reversed-phase copolymeric sorbent [namely, poly(divinylbenzene-co-N-vinylpyrrolidone)] containing a balanced ratio of hydrophilic and lipophilic monomers. Following elution by a 50-μL methanol plug in an air-segmented modality, the nickel is finally quantified by ETAAS. Under the optimized conditions and for a sample volume of 1.8 mL, a retention efficiency of 70 % and an enrichment factor of 25 were obtained. The proposed methodology showed a high tolerance to the commonly encountered alkaline earth matrix elements in environmental waters, that is, calcium and magnesium, and was successfully applied for the determination of nickel in an NIST standard reference material (NIST 1640-Trace elements in natural water), household tap water of high hardness and local seawater. Satisfying recoveries were achieved for all spiked environmental water samples with maximum deviations of 6 %. The experimental results for the standard reference material were not statistically different to the certified value at a significance level of 0.05.

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Acknowledgements

Xiangbao Long is grateful for a 3-year Ph.D. stipend granted to him by the Technical University of Denmark. Manuel Miró is indebted to the Spanish Ministry of Education and Science for financial support through the “Ramon y Cajal” research program.

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Authors and Affiliations

  1. Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, 2800, Kgs. Lyngby, Denmark

    Xiangbao Long, Rikard Jensen & Elo Harald Hansen

  2. Department of Chemistry, Faculty of Sciences, University of the Balearic Islands, Carretera de Valldemossa km. 7.5, 07122, Palma de Mallorca, Illes Balears, Spain

    Manuel Miró

Authors
  1. Xiangbao Long
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  2. Manuel Miró
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  3. Rikard Jensen
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  4. Elo Harald Hansen
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Correspondence to Manuel Miró or Elo Harald Hansen.

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Long, X., Miró, M., Jensen, R. et al. Highly selective micro-sequential injection lab-on-valve (μSI-LOV) method for the determination of ultra-trace concentrations of nickel in saline matrices using detection by electrothermal atomic absorption spectrometry. Anal Bioanal Chem 386, 739–748 (2006). https://doi.org/10.1007/s00216-006-0467-5

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  • DOI: https://doi.org/10.1007/s00216-006-0467-5

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