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
- 321 Downloads
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.
KeywordsSpeciation analysis 2-(Propylamino-ethyl)dithiocarbamate Metal-organic framework Water and tea samples Scanning electron microscopy Transition electron microscopy Vibrating sample magnetometry Nanosorbent Reference material
Compliance with ethical standards
The author declare that he has no competing interests.
- 4.Rocío-Bautista P, Martínez-Benito C, Pino V, Pasán J, Ayala JH, Ruiz-Pérez C, Afonso AM (2015) The metal-organic framework HKUST-1 as efficient sorbent in a vortex-assisted dispersive micro solid-phase extraction of parabens from environmental waters, cosmetic creams, and human urine. Talanta 139:13–20CrossRefGoogle Scholar
- 9.Taghizadeh M, Asgharinezhad AA, Pooladi M, Barzin M, Abbaszadeh A, Tadjarodi A (2013) A novel magnetic metal organic framework nanocomposite for extraction and preconcentration of heavy metal ions, and its optimization via experimental design methodology. Microchim Acta 180:1073–1084CrossRefGoogle Scholar
- 12.Bagheri H, Afkhami A, Saber-Tehrani M, Khoshsafar H (2012) Preparation and characterization of magnetic nanocomposite of Schiff base/silica/magnetite as a preconcentration phase for the trace determination of heavy metal ions in water, food and biological samples using atomic absorption spectrometry. Talanta 97:87–95CrossRefGoogle Scholar
- 25.Sadeghi S, Moghaddam AZ (2012) Preconcentration and speciation of trace amounts of chromium in saline samples using temperature-controlled microextraction based on ionic liquid as extraction solvent and determination by electrothermal atomic absorption spectrometry. Talanta 99:758–766CrossRefGoogle Scholar
- 26.Sadeghi S, Moghaddam AZ (2016) Multiple response optimization of sequential speciation of chromium in water samples by in situ solvent formation dispersive liquid–liquid microextraction prior to electrothermal atomic absorption spectrometry determination. J Iran Chem Soc 13:117–130CrossRefGoogle Scholar
- 30.Habila MA, ALOthman, ZA, El-Toni, AM, Labis, JP, Li, X, Zhang, F, Soylak, M (2016) Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type Fe3O4@SiO2@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS. Microchim Acta 1–8Google Scholar