Determination of inorganic selenium species in water and garlic samples with on-line ionic liquid dispersive microextraction and electrothermal atomic absorption spectrometry

Martinis, Estefanía Mabel; Escudero, Leticia Belén; Bertón, Paula; Monasterio, Romina Paula; Filippini, María; Wuilloud, Rodolfo G.

doi:10.1016/j.talanta.2011.07.065

Cited by 85 publications

(41 citation statements)

References 32 publications

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“…electrothermal atomic absorption spectrometry, 15,16 electrothermal vaporization-inductively coupled plasma-mass spectrometry, 14,19 total-reflection X-ray fluorescence spectrometry 17 or energy-dispersive X-ray fluorescence (EDXRF) spectrometry.…”

Section: Spementioning

confidence: 99%

“…16 Therefore, Se(IV) species can be separated and determined without the interference of Se(VI). In this way, Se(IV) is determined directly and total inorganic Se concentration is evaluated after reduction of Se(VI) to Se(IV) with e.g.…”

Section: Spementioning

confidence: 99%

“…hydrochloric acid. 9,12,[14][15][16]19 The determination of trace and ultratrace amounts of Se using SPE with or without chelating agent requires using a suitable solid sorbent: non-polar (C-18) sorbent, 10,11,20 26 In this paper, the preconcentration of Se using multiwalled carbon nanotubes (MWCNTs) as solid sorbent and APDC as chelating agent is proposed. Although MWCNTs are commonly used for the preconcentration of metal ions, they have not been yet applied in preconcentration of Se.…”

Section: Spementioning

confidence: 99%

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Determination of selenium by X-ray fluorescence spectrometry using dispersive solid-phase microextraction with multiwalled carbon nanotubes as solid sorbent

Skorek

Turek

Zawisza

et al. 2012

J. Anal. At. Spectrom.

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A dispersive solid-phase microextraction (DSPME) with multiwalled carbon nanotubes (MWCNTs) as solid sorbent and ammonium pyrrolidinedithiocarbamate (APDC) as chelating agent was developed for determination of selenium. In the proposed procedure, the Se(IV)-APDC complex is adsorbed on MWCNTs dispersed in aqueous samples. After the adsorption process, the aqueous samples are filtered and MWCNTs with selenium chelate are collected onto a filter. The loaded filters are directly measured using X-ray fluorescence (XRF) spectrometry. In order to obtain high recovery of the Se ions on MWCNTs, the proposed procedure was optimized for various analytical parameters such as pH, amounts of MWCNTs and APDC, sample volume and time of the sorption process. Under optimized conditions Se ions can be determined with very good recovery (97 AE 3%), precision (RSD ¼ 3.2%) and detection limits (from 0.06 to 0.2 ng mL À1 , depending on counting time and XRF equipment). The effect of common coexisting ions was also investigated. Se(IV) can be determined in the presence of heavy metal ions and alkali metals. The chemical interferences observed for high concentrations of Cu(II), Fe(III), and Zn(II) can be completely eliminated using precipitation with NaOH. The proposed method was applied for the determination of Se in mineral water and biological samples (Lobster Hepatopancreas). The proposed method can also be applied for selenium speciation. The concentration of selenate can be obtained as the difference between the concentration of selenite after and before prereduction of selenate to selenite.

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Section: Spementioning

confidence: 99%

Section: Spementioning

confidence: 99%

Section: Spementioning

confidence: 99%

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Determination of selenium by X-ray fluorescence spectrometry using dispersive solid-phase microextraction with multiwalled carbon nanotubes as solid sorbent

Skorek

Turek

Zawisza

et al. 2012

J. Anal. At. Spectrom.

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“…Selenite, selenate and total selenium were analyzed by an online Ionic liquid dispersive microextraction technique (ILDME) ( Table 1) connected to electrothermal atomic absorption spectroscopy (ET-AAS) [23]. The parameters that affect preconcentration and separation were carefully studied.…”

Section: Selenium Lpme Coupled With Atomic Absorption Spectroscopy (Aas)mentioning

confidence: 99%

Recent Microextraction Techniques for Determination and Chemical Speciation of Selenium

et al. 2017

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Abstract:Research designed to improve extraction has led to the development of microextraction techniques (ME), which involve simple, low cost, and effective preconcentration of analytes in various matrices. This review is concerned with the principles and theoretical background of ME, as well as the development of applications for selenium analysis during the period from 2008 to 2016. Among all ME, dispersive liquid-liquid microextraction was found to be most favorable for selenium. On the other hand, atomic absorption spectrometry was the most frequently used instrumentation. Selenium ME have rarely been coupled to spectrophotometry and X-ray spectrophotometry methods, and there is no published application of ME with electrochemical techniques. We strongly support the idea of using a double preconcentration process, which consists of microextraction prior to preconcentration, followed by selenium determination using cathodic stripping voltammetry (ME-CSV). More attention should focus on the development of accurate, precise, and green methods for selenium analysis.

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“…As a sample preparation method, OS-DLLME and IL-DLLME have been applied to the analysis of chlorophenols [9] and inorganic selenium species [10] in water samples, aromatic amines in environmental samples [11], herbicides [12] and pyrethroid pesticides [13] in food samples, clozapine and chlorpromazine [14] in urine samples, and rhodium [15] and mercury [16] in water samples. In addition, DLLME has recently been applied to the analysis of active compounds in Chinese medicine [17], and some related works have been done in our laboratory [18,19].…”

Section: Introductionmentioning

confidence: 99%

Dispersive Liquid–Liquid Microextraction Coupled with High-Performance Liquid Chromatography for Determination of Coumarin Compounds in Radix Angelicae Dahuricae

Zhang

et al. 2012

Chromatographia

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In this paper, two methods, organic solvent dispersive liquid-liquid microextraction (OS-DLLME) and ionic liquid dispersive liquid-liquid microextraction (IL-DLLME), coupled with high-performance liquid chromatography have been critically compared and introduced for the analysis of the eight coumarin compounds (psoralen, isopsoralen, bergapten, isobergapten, oxypeucedanin, imperatorin, osthole, and isoimperatorin) in Radix Angelicae Dahuricae samples. Experimental conditions have been investigated for both OS-DLLME and IL-DLLME. Under optimal conditions, the detection limits of the eight coumarin compounds obtained by OS-DLLME and IL-DLLME ranged between 0.002-0.026 ng mL -1 and 0.013-0.66 ng mL -1 , respectively. The relative standard deviations (RSDs, n = 9) were lower than 8.7 and 8.4% with enrichment factors in the range of 145-380 and 130-230 folds for OS-DLLME and IL-DLLME, respectively. The results showed that there were no significant deviations between the two DLLME methods for the determination of the eight coumarin compounds. Both methods were simple, fast, efficient, and inexpensive. However, compared with IL-DLLME, the OS-DLLME technique exhibited a higher extraction capacity for the eight target analytes.

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Determination of inorganic selenium species in water and garlic samples with on-line ionic liquid dispersive microextraction and electrothermal atomic absorption spectrometry

Cited by 85 publications

References 32 publications

Determination of selenium by X-ray fluorescence spectrometry using dispersive solid-phase microextraction with multiwalled carbon nanotubes as solid sorbent

Determination of selenium by X-ray fluorescence spectrometry using dispersive solid-phase microextraction with multiwalled carbon nanotubes as solid sorbent

Recent Microextraction Techniques for Determination and Chemical Speciation of Selenium

Dispersive Liquid–Liquid Microextraction Coupled with High-Performance Liquid Chromatography for Determination of Coumarin Compounds in Radix Angelicae Dahuricae

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