Determination of cobalt, copper and nickel in food samples after pre-concentration on a new pyrocatechol-functionalized polyurethane foam sorbent

Lemos, Valfredo Azevedo; Passos, Adenilde Souza dos; Novaes, Geisiane dos Santos; Santana, Débora de Andrade; Carvalho, Anaildes Lago de; Silva, Douglas Gonçalves da

doi:10.1016/j.reactfunctpolym.2007.03.011

Cited by 35 publications

(16 citation statements)

References 26 publications

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“…Copper is known to both vital and toxic for many biological systems and may enter the food materials from soil through mineralization by crops, food processing or environmental contamination (Lemos et al 2007). Copper level of investigated salt samples (Table 1) is found by the presented method in the range of 0.17-0.47 μg g −1 .…”

Section: Resultsmentioning

confidence: 92%

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Heavy metal contents of refined and unrefined table salts from Turkey, Egypt and Greece

Soylak

Peker

Türkoğlu

2007

Environ Monit Assess

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Trace metal contents of 28 of refined and unrefined table salt samples from Turkey, Egypt and Greece have been determined by flame atomic absorption spectrometry after coprecipitation by dysprosium(III) hydroxide. Copper, nickel, cobalt, manganese, lead and cadmium levels were found in the range of 0.17-0.47, 0.16-1.57, 0.22-0.48, 0.26-4.68, 0.50-1.64 and 0.14-0.30 microg g(-1), respectively. The results found in the presented work were compared with literature values.

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Section: Resultsmentioning

confidence: 92%

“…Trace elements including metals are significant in nutrition, either for their essential nature or toxicity Dursun et al 2005;Lemos et al 2007;Cunha 2006;Unak et al 2007). Trace metals such as copper, iron, and zinc, among others, while considered essential for normal body functions, are toxic at high concentrations.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal contents of refined and unrefined table salts from Turkey, Egypt and Greece

Soylak

Peker

Türkoğlu

2007

Environ Monit Assess

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“…Deleuze et al (2000) reported the preparation of polymer-supported transesterification and epoxidation catalysts by immobilizing Ti(OiPr) and TiCl 4 on N-(3,4-dihydroxybenzyl)maleimide resin through the catechol units. The catechol-attached polyurethane foam is used as a sorbent in determining heavy-metal ions in food samples (Lemos et al 2007). The PAAm and THB-PAAm adsorbents were made by cross-linking their corresponding soluble polymers by applying the oxidative decarboxylation conditions of Minisci as shown in Schemes 2 and 3.…”

Section: Metallic Adsorption-desorption Studymentioning

confidence: 99%

Polyacrylamide-Based Sorbents for the Removal of Hazardous Metals

Moulay

Bensacia

Garin

et al. 2013

Adsorption Science & Technology

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ABSTRACT:Polyacrylamide was synthesized and chemically modified (PAAm) with 1,2,4,5-tetrahydroxybenzene (THB) or benzene-1,2,4,5-tetrol by applying the reaction conditions of Minisci. A degree of modification as high as 42% was obtained under the following conditions: temperature of 70-80 °C, reaction time of 3 hours and [2,5-dihydroxy-1,4-benzoquinone]-to-[AAm] ratio of 2.5. The synthesized PAAm and its modified form (THB-PAAm) were characterized by UV-Vis, Fourier transform infrared spectroscopy, 13 C nuclear magnetic resonance, differential scanning calorimetry and thermogravimetric analysis. A severe degradation of the modified PAAm was observed, as confirmed by its relatively low molecular weight. Yet, the glass-transition temperature of THB-PAAm was found to be drastically lower than that of pristine PAAm, 63.1 versus 161.19 °C. A study of copper(II) adsorption by the cross-linked PAAm and THB-PAAm resins was undertaken by varying the following parameters: pH, time, temperature, ionic strength, sorbent mass and initial copper(II) concentration. Adsorption of Pb(II) and Cd(II) by the resins and their corresponding desorption extents were estimated. A new way of crosslinking polyacrylamide and its modified form through an oxidative decarboxylation process is applied.

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“…Las variaciones en el contenido también dependen de la naturaleza física del suelo y la capacidad de absorción de cada especie vegetal (Amin, Hussain, Alamzeb, & Begum, 2013;Lemos et al, 2007;Li et al, 2012). Cerca de 29.3% de las muestras de vegetales y fruta recolectados de algunas marismas recuperadas como tierras de cultivo en China supera el nivel máximo permitido de Ni en los alimentos debido al gran crecimiento económico que potencia industrias muy contaminantes como la electrónica, metalúrgica y minera, próximas a los cultivos (Li et al, 2012).…”

Section: Productos Vegetalesunclassified

Níquel en alimentos y factores influyentes en sus niveles, ingesta, biodisponibilidad y toxicidad: una revisión

Arias

Valverde-Som

Rodríguez

et al. 2014

CyTA - Journal of Food

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Determination of cobalt, copper and nickel in food samples after pre-concentration on a new pyrocatechol-functionalized polyurethane foam sorbent

Cited by 35 publications

References 26 publications

Heavy metal contents of refined and unrefined table salts from Turkey, Egypt and Greece

Heavy metal contents of refined and unrefined table salts from Turkey, Egypt and Greece

Polyacrylamide-Based Sorbents for the Removal of Hazardous Metals

Níquel en alimentos y factores influyentes en sus niveles, ingesta, biodisponibilidad y toxicidad: una revisión

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