Liquid-phase microextraction as an attractive tool for multielement trace analysis in combination with X-ray fluorescence spectrometry: an example of simultaneous determination of Fe, Co, Zn, Ga, Se and Pb in water samples

Sitko, Rafał; Kocot, Karina; Zawisza, Beata; Feist, Barbara; Pytlakowska, Katarzyna

doi:10.1039/c1ja10143a

Cited by 33 publications

(7 citation statements)

References 37 publications

(37 reference statements)

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“…Therefore, pH 3 was selected for further experiments. This pH (3) was in agreement with those found for Fe extraction using APDC as the complexant agent …”

Section: Resultssupporting

confidence: 89%

Simple and Fast Method for Iron Determination in White and Red Wines Using Dispersive Liquid–Liquid Microextraction and Ultraviolet–Visible Spectrophotometry

Maciel

Soares

Mandlate

et al. 2014

J. Agric. Food Chem.

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This work reports the development of a method for Fe extraction in white and red wines using dispersive liquid-liquid microextraction (DLLME) and determination by ultraviolet-visible spectrophotometry. For optimization of the DLLME method, the following parameters were evaluated: type and volume of dispersive (1300 μL of acetonitrile) and extraction (80 μL of C(2)Cl(4)) solvents, pH (3.0), concentration of ammonium pyrrolidinedithiocarbamate (APDC, 500 μL of 1% m/v APDC solution), NaCl concentration (not added), and extraction time. The calibration curve was performed using the analyte addition method, and the limit of detection and relative standard deviation were 0.2 mg L(-1) and below 7%, respectively. The accuracy was evaluated by comparison of results obtained after Fe determination by graphite furnace atomic absorption spectrometry, with agreement ranging from 94 to 105%. The proposed method was applied for Fe determination in white and red wines with concentrations ranging from 1.3 to 4.7 mg L(-1).

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“…Therefore, pH 3 was selected for further experiments. This pH (3) was in agreement with those found for Fe extraction using APDC as the complexant agent …”

Section: Resultssupporting

confidence: 89%

Simple and Fast Method for Iron Determination in White and Red Wines Using Dispersive Liquid–Liquid Microextraction and Ultraviolet–Visible Spectrophotometry

Maciel

Soares

Mandlate

et al. 2014

J. Agric. Food Chem.

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“…In a previous work it has been pointed out that the diameter of the analyzed sample is a critical parameter in XRF analysis . It has to be ensured that the whole sample is irradiated and the resulting element characteristic radiation is acquired by the detector system.…”

Section: Results and Discussionmentioning

confidence: 99%

Polymer Inclusion Membrane as an Effective Sorbent To Facilitate Mercury Storage and Detection by X-ray Fluorescence in Natural Waters

et al. 2018

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A novel and simple method is presented for the preconcentration and determination of mercury (Hg) from natural waters through its extraction into a polymer inclusion membrane (PIM) containing the task-specific ionic liquid trioctylmethylammonium thiosalicylate (TOMATS) followed by Energy Dispersive X-ray fluorescence (EDXRF) analysis. The determination was made directly on the membrane without any treatment or elution step, and due to the characteristics of the PIM no matrix or thickness corrections were required in EDXRF analysis. Under the best extracting and EDXRF operating conditions, a Hg limit of detection of 0.2 μg Hg L was obtained. Moreover, no water matrix effect was observed when Hg was extracted from different types of water such as river, seawater, groundwater, and tap water, showing this extraction system as a global solution when dealing with natural waters. Interestingly, this Hg collected in the PIM has shown to be stable for at least 6 months without the use of any preservative. This fact is of prime importance taking into account the usual stability problems of Hg during sample storage.

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“…Nevertheless, for a better comparison, in both cases the same support size was considered. Moreover, in a previous publication it was demonstrated that if the dried residue is too large, only a small fraction of the analyte is excited and in consequence a low intensity of fluorescent radiation is observed [21].…”

Section: Sample Volume Deposited On the Sample Supportmentioning

confidence: 99%

A sustainable and simple energy dispersive X-ray fluorescence method for sulfur determination at trace levels in biodiesel samples via formation of biodiesel spots on a suitable solid support

Marguí

Resano

Queralt

2019

Spectrochimica Acta Part B: Atomic Spectroscopy

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The aim of the present work is the development of a simple, sensitive and sustainable EDXRF method for the determination of trace amounts of sulfur in biodiesel samples. In this method, the deposition of several microliters of sample onto an organic thin layer and the analysis of the resulting adsorbed biodiesel spot by benchtop EDXRF is proposed. A careful study was performed to select the volume and the best solid support to deposit biodiesel samples, including filters made of different materials (glass fiber, Nylon, cellulose, paper) and a commercial disposable absorbent pad (UltraCarry, Rigaku). A critical issue that limits the use of most of these solid supports was the relative high blank signals that hamper the determination of sulfur at trace levels. Finally, it was found that best strategy was the deposition of 50 µL of biodiesel on the UltraCarry sample retainer. Operating conditions for EDXRF measurements were also evaluated to obtain the best instrumental sensitivity for sulfur determination (Excitation: 20 kV, no primary filter, measurement time: 300s). Using the best analytical conditions the quantification limit of the method was 7 mg kg-1 of sulfur. This value is even better than the one reported in the ASTM D4294 method (LOQ: 16.0 mg kg-1) but using a sample amount 100 times smaller. The linearity was confirmed in the range of 10-100 mg kg-1 by analyzing a set of commercial biodiesel standards. Accuracy and precision of the results, evaluated by the analysis of samples prepared with the same matrix as the standards, with levels of 20, 40 and 75 mg kg-1 of sulfur, and processed as unknowns, proved acceptable (Recoveries: 94.3-110.6%, RSD: 10.8-13.6%, n=3) for the intended purpose. Overall, the performance of the method developed is promising and it could be used to determine trace amounts of sulfur in biodiesel samples in a simple, sustainable and cost-effective way. Furthermore, since the original sample is adsorbed onto a solid support, repeat confirmatory analyses on the same specimen, if needed, can be carried out.

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Liquid-phase microextraction as an attractive tool for multielement trace analysis in combination with X-ray fluorescence spectrometry: an example of simultaneous determination of Fe, Co, Zn, Ga, Se and Pb in water samples

Cited by 33 publications

References 37 publications

Simple and Fast Method for Iron Determination in White and Red Wines Using Dispersive Liquid–Liquid Microextraction and Ultraviolet–Visible Spectrophotometry

Simple and Fast Method for Iron Determination in White and Red Wines Using Dispersive Liquid–Liquid Microextraction and Ultraviolet–Visible Spectrophotometry

Polymer Inclusion Membrane as an Effective Sorbent To Facilitate Mercury Storage and Detection by X-ray Fluorescence in Natural Waters

A sustainable and simple energy dispersive X-ray fluorescence method for sulfur determination at trace levels in biodiesel samples via formation of biodiesel spots on a suitable solid support

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