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Microchimica Acta

, Volume 184, Issue 5, pp 1509–1516 | Cite as

A nanoparticle sorbent composed of MIL-101(Fe) and dithiocarbamate-modified magnetite nanoparticles for speciation of Cr(III) and Cr(VI) prior to their determination by electrothermal AAS

Original Paper

Abstract

The article describes a magnetic metal-organic framework (MOF) of the type MIL-101(Fe)/2-(propylamino-ethyl) dithiocarbamate on the surface of magnetite nanoparticles. The MOF is shown to be a viable material for speciation analysis of Cr(III) and Cr(VI) because it shows selectivity for Cr(VI) at pH values around 2.0, while at pH values around 5 both Cr(III) and Cr(VI) species are sorbed. Hence, preoxidation or reduction treatments are not needed. After optimization of the extraction conditions, chromium was quantified by ET-AAS. Feature of the determination of Cr(VI) include (a) a 1.0 ng L−1 limit of detection, (b) a linear analytical range that extends from 3 to 300 ng L−1, and (c) a relative standard deviation of 6.4%. The respective values for total chromium are 1.5 ng L−1, 4 to 325 ng L−1 and 7.5%, respectively. The method was validated by analyzing two certified reference materials. It also was successfully employed to the rapid extraction and speciation of Cr(III) and Cr(VI) in (spiked) water samples and of total chromium in tea samples.

Graphical abstract

A novel magnetic metal-organic framework [a MIL-101(Fe)/2-(propylamino-ethyl) dithiocarbamate modified magnetite nanoparticle composite] was synthesized and utilized for speciation analysis of Cr(III) and Cr(VI) via determination by electrothermal atomic absorption spectrometry. (a) A schematic representation for synthesis of Fe3O4@PAEDTC NPs. (b) Schematic illustration of the synthesis of MIL-101(Fe)/Fe3O4@ PAEDTC nanocomposite.

Keywords

Speciation analysis 2-(Propylamino-ethyl)dithiocarbamate Metal-organic framework Water and tea samples Scanning electron microscopy Transition electron microscopy Vibrating sample magnetometry Nanosorbent Reference material 

Notes

Compliance with ethical standards

The author declare that he has no competing interests.

Supplementary material

604_2017_2155_MOESM1_ESM.docx (931 kb)
ESM 1 (DOCX 931 kb)

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Copyright information

© Springer-Verlag Wien 2017

Authors and Affiliations

  1. 1.Young Researchers and Elite Club, North Tehran BranchIslamic Azad UniversityTehranIran

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