Cloud point extraction preconcentration and spectrophotometric determination of copper in food and water samples using amino acid as the complexing agent

Liang, Pei; Yang, Juan

doi:10.1016/j.jfca.2009.01.015

Cited by 75 publications

(26 citation statements)

References 21 publications

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“…This coincides with the PZC values being 2.3. Similar results have been obtained for complexation of metal ions with functional groups of amino acids (Liang and Yang, 2010). In acidic media (pH < 2.3) the active sites of the sorbent such as carboxyl and amine groups are protonated and therefore, no complexation was observed.…”

Section: Effect Of Ph On Biosorptionsupporting

confidence: 84%

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

Pelit

Ertaş

Eroğlu

et al. 2011

Bioresource Technology

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a b s t r a c tAside from its excellent mechanical properties, spider silk (SS) would offer an active surface for heavy metal interaction due to its rich protein structure. The present study describes the potential use of natural (SS) as a sorbent of heavy metals from aqueous solutions. Single and multi-species biosorption experiments of heavy metals by natural SS were conducted using batch and column experiments. The biosorption kinetics, in general, was found to follow the second-order rate expression, and the experimental equilibrium biosorption data fitted reasonably well to Freundlich isotherm. From the Freundlich isotherm, the biosorption capacities of Cu(II) and Pb(II) ions onto SS were found as 0.20 and 0.007 mmol g -1 , respectively. The results showed a decrease in the extent of metal ion uptake with lowering the pH.

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Section: Effect Of Ph On Biosorptionsupporting

confidence: 84%

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

Pelit

Ertaş

Eroğlu

et al. 2011

Bioresource Technology

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“…According to the National Council for the Environmental in Brazil (CONAMA), the allowed levels of copper in natural waters are 9.0 μg L −1 (Class 1) and 13.0 μg L −1 (Class 3), in saline waters are 5.0 μg L −1 (Class 1), 7.8 μg L −1 (Class 2), and 1.0 mg L −1 for copper present for effluent discharge [3]. Some reports have presented the levels of copper around the world in uncontaminated water samples such as superficial coastal seawater samples less than 5.0 μg L −1 [4], river, mineral and tap waters ranging from 3.05 up to 5.67 μg L −1 [1] and lake water with 11.5 μg L −1 [5]. Copper amounts in milk at 12.2 μg L −1 [6]; natural food such as cassava leaves, lettuce leaves, water-cress leaves, wheat flour, manioc flour, soy-bean flour and oat flour ranging from 1.14 up to 4.57 μg g −1 [7]; canned fish, black tea, green tea and tomato sauce ranging from 0.68 up to 4.92 μg g −1 have been reported [8].…”

Section: Introductionmentioning

confidence: 99%

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

et al. 2012

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We describe the analytical performance of a hybrid material composed of SiO 2 , Al 2 O 3 and TiO 2 . It was prepared by a sol-gel process and can act as an adsorbent in the continuous-flow enrichment of copper. A minicolumn was packed with the material, copper ions are adsorbed at pH 9.13, then eluted with 1.0 mol L −1 nitric acid, and determined by FAAS. The material was characterized by infrared spectroscopy, scanning electron and energy dispersive spectroscopy, energy dispersive X-ray fluorescence analysis, powder Xray diffraction, and specific surface area analysis. No significant interference was observed for most ions in up to copper/ interferent ratios of 1:100 and of 1:500 in case of Ca(II), Ba (II), and Mg(II). The breakthrough capacity is 1.4 mg g −1 under dynamic conditions. The limits of detection and of quantification are 0.50 and 1.4 μg L −1 , respectively, and the calibration plot is linear in the range from 5.0 to 245.0 μg L −1 (r00.999). The relative standard deviation is 3.20 (for n07 and at a Cu(II) concentration of 10 μg L −1 ). The method was applied to the determination of trace copper ions in water, vegetable and alcohol fuel samples.

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“…9,10 Therefore, a suitable sample pretreatment step is a required step prior to the analysis. Several techniques including solid phase extraction, 11,12 liquid-liquid extraction, [13][14][15][16] cloud point extraction, [17][18][19] and co-precipitation 20,21 have been employed to solve this issue. Most of these techniques suffer from limitations that limit their application.…”

Section: Introductionmentioning

confidence: 99%

Determination of Traces of Ni, Cu, and Zn in Wastewater and Alloy Samples by Flame-AAS after Ionic Liquid-Based Dispersive Liquid Phase Microextraction

Zare-Shahabadi

Asaadi

Abbasitabar

et al. 2016

J. Braz. Chem. Soc.

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A procedure has been developed for simultaneous separation/preconcentration of copper, nickel, and zinc based on in situ ionic liquid-based dispersive liquid-liquid microextraction method as a prior step to their determination by flame atomic absorption spectrometry. The analytes reacted with sodium diethyl dithiocarbamate at pH 7 to form hydrophobic chelates, which were separated and preconcentrated in the ionic liquid phase. The method is fast, simple, accurate, and environmentally friendly. The parameters affecting the extraction efficiency of the proposed method such as the pH of sample solution, centrifugation time, type and volume of the dispersive solvent, and the salt effect were studied. Enrichment factors of 61.8, 61.2, and 40.0 and detection limits of 0.79, 0.93, and 0.71 µg L -1 were obtained for copper, nickel, and zinc, respectively. The relative standard deviations based on six replicate measurements were between 1.0 and 2.7%. The method was successfully applied to the extraction and determination of these metals in wastewater and alloy samples.Keywords: dispersive liquid-liquid microextraction, nickel, zinc, copper, ionic liquid, sodium diethyl dithiocarbamate IntroductionIn the priority list of Agency for Toxic Substances and Disease Registry (ATSDR), Ni is at rank 57, Zn at 75, and Cu at 118.1 Nickel is essential for many biological activities such as activation of some enzymes and enhancement of insulin activity. 2 Copper plays important roles in metabolism, including antioxidant effects, energy generation and incorporation of Fe into hemoglobin.3 Zinc also has an important role in various biological systems, such as gene expression, protein-protein interaction, and neurotransmission. 4 Although nickel, copper, and zinc come into the category of essential trace elements, when they are taken at high levels, they can also produce toxic effects. 5-8Thus, determination and monitoring of these toxic metals in industrial effluent, biological samples and food stuff are of prime concern.The trace elements level in samples to be analyzed are sometimes lower than the detection limit of analytical instruments such as flame atomic absorption spectroscopy (FAAS), inductively coupled plasma optical emission spectrometry (ICP OES) and graphite furnace-atomic absorption spectrometry (GF-AAS).9,10 Therefore, a suitable sample pretreatment step is a required step prior to the analysis. Several techniques including solid phase extraction, 11,12 liquid-liquid extraction, [13][14][15][16] cloud point extraction, 17-19 and co-precipitation 20,21 have been employed to solve this issue. Most of these techniques suffer from limitations that limit their application. Some examples of these limitations include significant chemical additives, solvent losses, large secondary wastes, unsatisfactory enrichment factors, complex equipment, and high time consumption.Dispersive liquid-liquid microextraction (DLLME) overcomes some of the drawbacks of old sample preparation techniques. [22][23][24] It is simple, fast, and does n...

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Cloud point extraction preconcentration and spectrophotometric determination of copper in food and water samples using amino acid as the complexing agent

Cited by 75 publications

References 21 publications

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

Biosorption of Cu(II) and Pb(II) ions from aqueous solution by natural spider silk

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

Determination of Traces of Ni, Cu, and Zn in Wastewater and Alloy Samples by Flame-AAS after Ionic Liquid-Based Dispersive Liquid Phase Microextraction

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