Cloud point extraction, preconcentration and simultaneous spectrophotometric determination of nickel and cobalt in water samples

Safavi, Afsaneh; Abdollahi, Hamid; Nezhad, Mohammad Reza Hormozi; Kamali, Reza

doi:10.1016/j.saa.2004.02.001

Cited by 154 publications

(88 citation statements)

References 14 publications

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“…Due to the studies on chicks and rats, nickel is apparently essential for proper liver function, or cobalt is at the core of a vitamin B12. On the other hand, some of nickel and cobalt compounds are carcinogenic (Manzoori et al 2000, Safavi et al 2004and 2006, Jianget al 2008. Arsenic is well known to be poisonous to organisms; however, the toxic effect of arsenic is highly dependent on its chemical forms in water or food.…”

Section: Introductionmentioning

confidence: 99%

The evaluation and determination of heavy metals pollution in edible vegetables, water and soil in the south of Tehran province by GIS

Shirkhanloo¹,

Mirzahosseini²,

Shirkhanloo³

et al. 2015

Archives of Environmental Protection

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Abstract:In this study, heavy metals pollutions in waters, soils and vegetables were investigated from farms, near oil refi nery in south of Tehran city, Iran (Shahre Ray). The most important heavy metals in Iranian oil are vanadium, cobalt, nickel, arsenic and mercury (V, Co, Ni, As, Hg). In this region, the concentration of heavy metals in soils, well waters and leafy edible vegetables were evaluated in ten different points of farms. Geographic information systems (GIS) were used to estimate the levels of heavy metals concentration at unmeasured locations. After sample preparation, concentrations of heavy metals in vegetables, soils and waters were determined by atomic absorption spectrometry (AAS). Five different leafy edible vegetables from farms, i.e., Persian leek, dill, parsley, spinach and radish were sampled in spring, summer and autumn 2012. In vegetables and well water samples, the concentrations of V, Ni and Co were above the permissible limit of heavy metals as compared to WHO guidelines and the concentrations of these metals in agricultural soils were found to be lower in accordance to soil references. The industrial waste waters had high concentration of heavy metals in this area. In consequence, the results of this study indicate that industrial waste water can cause pollution in well waters and edible vegetables. So, this region is not suitable for cultivation and growing vegetables.Unauthenticated Download Date | 5/13/18 2:45 AM

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Section: Introductionmentioning

confidence: 99%

The evaluation and determination of heavy metals pollution in edible vegetables, water and soil in the south of Tehran province by GIS

Shirkhanloo¹,

Mirzahosseini²,

Shirkhanloo³

et al. 2015

Archives of Environmental Protection

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“…To date, most of the studies conducted have shown that ionic strength has no appreciable effect on the extraction efficiency. 33 Therefore, to investigate the influence of ionic strength on extraction efficiency, various experiments were performed by adding different amounts of NaNO 3 (0-1 mol L -1…”

Section: Effect Of Ionic Strength and Centrifugation Timementioning

confidence: 99%

“…Several methods have been proposed for separation and preconcentration of trace amount of nickel including liquid-liquid extraction (LLE), [26][27][28] solid phase extraction (SPE), [29][30][31][32] cloud point extraction (CPE) [33][34][35][36] and liquid phase microextraction (LPME). [37][38][39] Preconcentration methods involving cloud point extraction have attracted considerable attention because the procedures are fast, simple and efficient, avoid the use of large quantities of toxic organic solvents and promote high enrichment factors.…”

Section: Introductionmentioning

confidence: 99%

Ligandless cloud point extraction for trace nickel determination in water samples by flame atomic absorption spectrometry

Abdolmohammad‐Zadeh

Ebrahimzadeh

2011

J. Braz. Chem. Soc.

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Para a preconcentração de quantidades traço de níquel foi desenvolvida uma metodologia muito simples a partir da extração do ponto nuvem (CPE) e com a ausência de ligantes-quelantes como uma etapa prévia para a determinação de Ni por espectrometria de absorção atômica com chama (FAAS). O método é baseado na extração de Ni em pH 10 usando-se o surfactante iônico mono-p-nonilfenileter polietilenoglicol (PONPE 7.5) sem adição de nenhum agente quelante. As variáveis que afetam a eficiência da extração foram investigadas e otimizadas. O limite de deteção (LOD) e o limite de quantificação (LOQ) para a preconcentração de 50 mL de uma solução aquosa de Ni, respectivamente. Os desvios padrão relativos (RSD) para seis determinações em replicatas de soluções contendo 50 e 80 µg L -1 de Ni 2+ foram 2,67% e 1,97%, respectivamente. A curva analítica de calibração, com a preconcentração, mostrou-se linear no intervalo avaliado e com um coeficiente de correlação r = 0.9941. O método proposto foi validado com análise do material de referência certificado de água NIST SRM 1643e e o resultado encontra-se de acordo com o valor certificado. O método foi aplicado com sucesso à determinação de quantidades traço de íons Ni em amostras de água.A very simple and ligandless cloud point extraction (CPE) methodology has been developed for the preconcentration of trace amounts of nickel as a prior step to its determination by flame atomic absorption spectrometry (FAAS). The method is based on the extraction of nickel at pH 10 by using non-ionic surfactant polyethyleneglycol mono-p-nonylphenylether (PONPE 7.5) without adding any chelating agent. Several variables affecting the extraction efficiency were investigated and optimized. The limit of detection (LOD) and limit of quantification (LOQ) values of nickel for the preconcentration of 50 mL of aqueous solution were 0.5 µg L -1 and 1.6 µg L -1 , respectively. The relative standard deviation (RSD) for six replicate determinations at 50 and 80 µg L -1 of Ni were 2.67% and 1.97%, respectively. The calibration graph using the preconcentration system for nickel was linear with a correlation coefficient r = 0.9941. To validate the proposed method a standard reference material NIST SRM 1643e (trace elements in water) was analyzed and the result was in good agreement with the certified value. The proposed method was successfully applied to determination of trace amounts of nickel in water samples.

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“…However, the amount of used solvent is still in the order of several hundred micro liters per analysis. Also preconcentration of cobalt in some CPE methods has been reported (Bezerra et al, 2007;Chen & Teo, 2001;Donati et al, 2006;Ghaedi et al, 2008;Gil et al, 2008;Nascentes & Arruda, 2003;Safavi et al, 2004;Shemirani & Shokoufi, 2006;Shokoufi et al, 2007b). Despite many benefits from the use of CPE, in high content of salt, background is increased since the enrichment phase is composed of a little aqueous sample and in very high content of salt, the density of the sample becomes equal or even higher than that of micelles, therefore they can not be settled.…”

Section: Cobalt; the Occurrence Benefits And Applications Exposure mentioning

confidence: 99%

Cold-Induced Aggregation Microextraction: A Novel Sample Preparation Technique Based on Ionic Liquids for Preconcentration of Cobalt Prior to Its Determination by Fiber Optic-Linear Array Detection Spectrophotometry in Real Water Samples

Gharehbaghi¹,

Shemirani²,

Farahani³

et al. 2011

Ionic Liquids: Applications and Perspectives

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Cloud point extraction, preconcentration and simultaneous spectrophotometric determination of nickel and cobalt in water samples

Cited by 154 publications

References 14 publications

The evaluation and determination of heavy metals pollution in edible vegetables, water and soil in the south of Tehran province by GIS

The evaluation and determination of heavy metals pollution in edible vegetables, water and soil in the south of Tehran province by GIS

Ligandless cloud point extraction for trace nickel determination in water samples by flame atomic absorption spectrometry

Cold-Induced Aggregation Microextraction: A Novel Sample Preparation Technique Based on Ionic Liquids for Preconcentration of Cobalt Prior to Its Determination by Fiber Optic-Linear Array Detection Spectrophotometry in Real Water Samples

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