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Speciation Analysis of Mn(II)/Mn(VII) in Tea Samples Using Flame Atomic Absorption Spectrometry After Room Temperature Ionic Liquid-Based Dispersive Liquid–Liquid Microextraction

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Abstract

A simple and rapid method based on dispersive liquid–liquid microextraction with room temperature ionic liquid 1,3-dibutylimidazolium hexafluorophosophate ([BBIM][PF6]) coupled to flame atomic absorption spectrometry was developed for the speciation of Mn(II)/Mn(VII) in tea samples. The main factors affecting dispersive liquid–liquid microextraction were investigated in detail. Mn(II) and total manganese [Mn(II)+Mn(VII)] were quantitatively extracted after adjusting aqueous sample solution to pH 10.0 and 7.0, respectively. Mn(VII) was calculated by subtraction of Mn(II) from total manganese. Under the optimized conditions, the limits of detection (3σ) for Mn(II) and Mn(VII) were 0.26 and 1.86 ng/mL, and their relative standard deviations were 2.6 and 4.8 % (n = 7, c = 25.00 ng/mL). The proposed method was validated by the determination of Mn(II) and Mn(VII) in the certified reference material [GBW(E)08513] of tea sample and different local tea samples with satisfactory results.

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Acknowledgments

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (20875082 and 2115500), the Foundation of the Excellence Science and Technology Invention Team in Yangzhou University, and the Graduate Innovation Project Foundation of Jiangsu province (CXLX12-0908).

Conflict of Interest

Authors have a financial relationship with the organizations that sponsored the research, and the organizations are listed as follows: Prof. Xiashi Zhu has received research grants from the National Natural Foundation of China, Yangzhou University and the Education Department of Jiangsu Province. Shengping Wen has received research grants from the National Natural Foundation of China and the Education Department of Jiangsu Province(CXLX12-0908).

Ethical Standards—Animal Rights and Informed Consent

The research proposed in this article does not contain any studies with human or animals subjects for the following reasons: (1) the materials used in this work are common chemical reagents without any animals and human involved; (2) the real samples studied in our work are local tea samples, which are often consumed drinking in Chinese daily life, and these tea samples can be easily bought and obtained from local markets. Therefore, there are no ethical issues with human or animal subjects in our studies.

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Authors and Affiliations

  1. College of Chemistry & chemical Engineering, Yangzhou University, Yangzhou, 225002, People’s Republic of China

    Shengping Wen & Xiashi Zhu

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  1. Shengping Wen
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  2. Xiashi Zhu
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Correspondence to Xiashi Zhu.

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Wen, S., Zhu, X. Speciation Analysis of Mn(II)/Mn(VII) in Tea Samples Using Flame Atomic Absorption Spectrometry After Room Temperature Ionic Liquid-Based Dispersive Liquid–Liquid Microextraction. Food Anal. Methods 7, 291–297 (2014). https://doi.org/10.1007/s12161-013-9626-4

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  • DOI: https://doi.org/10.1007/s12161-013-9626-4

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