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New approach for detection of chromate ion by preconcentration with mixed metal hydroxide coupled with fluorescence sensing of copper nanoclusters

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Abstract

The authors describe a two-step strategy for in-situ dispersive solid phase extraction (is-dSPE) of Cr(VI) ion (chromate) prior to its determination by using copper nanoclusters capped with 4,6-diamino-2-mercaptopyrimidine (DAMP-CuNCs) as a fluorescent probe. By emulating the formation of layered double hydroxides and taking advantage of their compositions, the extraction of chromate is accomplished by rapidly dispersing a suspension of mixed hydroxides of Mg2+ and Al3+ into the sample solution. After enrichment, chromate is directly quantified through selective quenching of the fluorescence of DAMP-CuNCs. This results from an inner filter effect caused by chromate only, while other anions have no effect. Under optimized conditions, the method has a linear response in the 1–7 μM chromate concentration range, and the lower limit of detection is 0.31 μM. The is-dSPE has improved detection sensitivity and has provided a highly selective response. It was successfully applied to the determination of chromate in (spiked) water samples, and the results agreed well with data obtained by ICP-OES.

Schematic of a two-step strategy for is-dSPE of Cr(VI) ion prior to its determination by using DAMP-CuNCs.

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Acknowledgements

This research was financially supported by the Thailand Research Fund (RSA6080006), the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University, and the Center of Excellence for Innovation in Chemistry (PERCH-CIC), Office of the Higher Education Commission, Ministry of Education.

In remembrance of His Majesty King Bhumibol Adulyadej (1927-2016), for his life-time dedication to Thailand.

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Authors and Affiliations

  1. Materials Chemistry Research Center, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Kanokwan Khonkayan, Sira Sansuk, Supalax Srijaranai & Wittaya Ngeontae

  2. Research Center for Environmental and Hazardous Substance Management, Khon Kaen University, Khon Kaen, 40002, Thailand

    Wittaya Ngeontae

  3. Center of Excellence for Environmental and Hazardous Waste Management (EHWM), Bangkok, 10330, Thailand

    Wittaya Ngeontae

  4. Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand

    Thawatchai Tuntulani

  5. Synchrotron Light Research Institute, Nakhon Ratchasima, 30000, Thailand

    Chatree Saiyasombat & Wutthikrai Busayaporn

Authors
  1. Kanokwan Khonkayan
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  2. Sira Sansuk
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  3. Supalax Srijaranai
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  4. Thawatchai Tuntulani
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  5. Chatree Saiyasombat
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  6. Wutthikrai Busayaporn
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  7. Wittaya Ngeontae
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Correspondence to Wittaya Ngeontae.

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Khonkayan, K., Sansuk, S., Srijaranai, S. et al. New approach for detection of chromate ion by preconcentration with mixed metal hydroxide coupled with fluorescence sensing of copper nanoclusters. Microchim Acta 184, 2965–2974 (2017). https://doi.org/10.1007/s00604-017-2320-2

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  • DOI: https://doi.org/10.1007/s00604-017-2320-2

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