Determination of trace copper in food samples by flame atomic absorption spectrometry after solid phase extraction on modified soybean hull

Xiang, Guoqiang; Zhang, Yingming; Jiang, Xiuming; He, Lijun; Fan, Li; Zhao, Wenjie

doi:10.1016/j.jhazmat.2010.03.034

Cited by 58 publications

(15 citation statements)

References 30 publications

(30 reference statements)

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“…The pH of the medium plays a key role in the extraction procedure improving the ligand-metal complex reaction efficiency. 3 The influence of the pH on the recovery of copper was studied in the range 3 to 9 by passing 500 mL solutions of 20 lg Cu(II) through the modified membrane disk. The pH values of the solutions were adjusted with 50 mL of Hydrion t buffer.…”

Section: Resultsmentioning

confidence: 99%

Colorimetric Solid-Phase Extraction Method for Cu(II) Ion Determination Using 2-Hydroxybenzaldehyde Benzoylhydrazone as Sensing Reagent

et al. 2014

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A new sensor based on the use of 2-hydroxybenzaldehyde benzoylhydrazone as a colorimetric reagent immobilized onto styrenedivinylbenzene disks has been carried out for the determination of Cu(II) ions within several minutes. The sensor is designed on a rapid and easy two-step procedure: (1) the extraction of Cu(II) ions onto a disk loaded with the copper-selective colorimetric reagent and (2) the determination of the complexed analyte directly on the surface of the disk using diffuse reflectance measurements at 400 nm. The color of the disk changed from white to green in the presence of Cu(II) ions. The work herein details the optimization of the sensing system employing a fractional factorial design 3(3-1) considering three variables (pH, immobilization time, and amount of ligand immobilized onto the disk). The Pareto chart and response surfaces in a spherical domain indicated that the optimum conditions for the sensing of copper ions were pH = 7, with a ligand immobilization time of 10 min and 6.25 mg of reagent loaded onto the disk. Under the optimum conditions, the analytical parameters of the proposed method were determined. The calibration graph was linear over the range of 0 to 2.5 mg L(-1) of Cu(II) with a detection limit of 0.21 mg L(-1). The relative standard deviation for six measurements of 1 mg L(-1) of Cu(II) was found to be 4.87%. The interference from inorganic salts and other metals was found not to be of major concern when monitoring copper ions in water samples. The simplicity and rapidity of this technique make it convenient and amenable for on-site and routine analysis.

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Section: Resultsmentioning

confidence: 99%

Colorimetric Solid-Phase Extraction Method for Cu(II) Ion Determination Using 2-Hydroxybenzaldehyde Benzoylhydrazone as Sensing Reagent

et al. 2014

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“…Cu was attended in some important biological mechanisms such as carbohydrate and lipid metabolism. However, the excessive amount of Cu could cause to harmful effects on the blood and kidney (Xiang et al, 2010). Mn was another essential metal and played an important role in the growth of plants.…”

Section: Concentrations Of Metals In the Seedsmentioning

confidence: 99%

Chemical Composition of Seeds of Two Endemic Lathyrus L. Species from Turkey

Arslan

Trak²,

Yıldırım³

et al. 2018

JBLS

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Genus Lathyrus L. belonging to Fabaceae (Leguminosae) family consisted of 77 taxa at the species, subspecies, and variety level at Turkey and 25 of that were known as endemic. Lathyrus egirdiricus H.Genc & A.Sahin and Lathyrus tefennicus H. Genç & A. Şahin were endemic species and described at the date of 2008 and 2011, respectively. The seeds of Lathyrus tefennicus and Lathyrus egirdiricus were collected in Tefenni of Burdur province and Eğirdir of Isparta province in May of 2016 at Turkey. The concentration of Cd, Cr, Ni, Cu, Mn, Zn, Fe, Ca, Mg, Na and K in the Lathyrus tefennicus and Lathyrus egirdiricus seeds were determined by Atomic Absorption Spectrometry. A microwave oven was used for the sample digestion. The accuracy of proposed method was confirmed by the analysis of the certified reference material (EnviroMAT Contaminated Soil). All results were given at 95% of confidence level. The presence of different concentrations of elements in the seeds of both species strengthens the belief that this data can be used in plant taxonomy.

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“…These strategies not only improve analyte detectability, but also are relevant for removing matrix components that may induce inaccurate measurements [14]. Several biosorbents have been used as a substrate for dissolved Cu separation and preconcentration, such as banana peel [15,16], corn silk [17], olive pomace [18], food waste biomass [19], peat [20], pinion shell [21], soybean hull [22],among others. They have been considered reliable and environmental-friendly alternatives to the aforementioned commercially available synthetic sorbents [23].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of calcium alginate microparticles for copper preconcentration prior to F AAS measurements in fresh water

Colombo¹,

Porto²,

Carvalho³

et al. 2019

Br J Anal Chem

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Graphical AbstractCu preconcentration for F AAS -Calcium alginate microparticles were used for the preconcentration of copper for F AAS analysis of fresh waters A method for separation and preconcentration of Cu 2+ from fresh waters prior to flame atomic absorption spectrometry (FAAS) measurements, using calcium alginate (CA) microparticles, is proposed. Off-line analytes preconcentration was achieved using a flow-injection system incorporating a column containing CA (< 180 μm; 300 mg). The preconcentration procedure consisted of 50 mL sample or standard (at pH = 6) loading at 2.0 mL min -1 followed by analyte elution with 3 mL of HCl 1 mol L -1 . In these conditions, the enrichment factor was 17 times. The calibration curves were built ranging from 5 to 50 µg L -1 Cu 2+ . The procedure was applied for the analysis of fresh water sample spiked with 10 µg L -1 Cu 2+ , resulting in a recovery higher than 94%. Additionally, inter-column reproducibility (RSD < 3,5%; n = 5 columns) and the limit of detection of 0.8 µg L -1 were considered appropriate by taking into the maximum permitted Cu levels by the Brazilian National Environment Council (CONAMA) of 9 µg L -1 (fresh water, Class 1). The proposed approach using CA columns is a reliable and lower cost alternative for single-stage Cu preconcentration prior to F AAS measurements and can be recommended for the analysis of river fresh waters. CA column re-usability was confirmed up to 100 adsorption-desorption cycles.

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Determination of trace copper in food samples by flame atomic absorption spectrometry after solid phase extraction on modified soybean hull

Cited by 58 publications

References 30 publications

Colorimetric Solid-Phase Extraction Method for Cu(II) Ion Determination Using 2-Hydroxybenzaldehyde Benzoylhydrazone as Sensing Reagent

Colorimetric Solid-Phase Extraction Method for Cu(II) Ion Determination Using 2-Hydroxybenzaldehyde Benzoylhydrazone as Sensing Reagent

Chemical Composition of Seeds of Two Endemic Lathyrus L. Species from Turkey

Evaluation of calcium alginate microparticles for copper preconcentration prior to F AAS measurements in fresh water

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