Glycerol–silica gel: A new solid sorbent for preconcentration and determination of traces of cobalt(II) ion

Safavi, Afsaneh; Iranpoor, Nasser; Saghir, Narges; Momeni, Safieh

doi:10.1016/j.aca.2006.03.079

Cited by 60 publications

(18 citation statements)

References 33 publications

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“…Recently, some chelating agents have been modified on silica gel as solid phase extractors for the pre-concentration of some metal ions. Safavi et al [18] used glycerol modified silica gel to enrich Co(II) in aqueous solutions before determination. Soliman et al [19] and Khan et al [20] modified silica gel chemically by 2-thiophenecarboxaldehyde and 1,5-diphenylcarbazide, respectively, then they used these extractors for the pre-concentration of Hg(II) in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Preparation of xylenol orange functionalized silica gel as a selective solid phase extractor and its application for preconcentration—separation of mercury from waters

Fan

Wei

et al. 2007

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Preparation of xylenol orange functionalized silica gel as a selective solid phase extractor and its application for preconcentration—separation of mercury from waters

Fan

Wei

et al. 2007

Journal of Hazardous Materials

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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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“…Up to now, various SPE sorbents have been employed for the preconcentration and determination of cobalt both in batch and FI modes. Some of these sorbents include C-18 bonded silica, 9-12 activated carbon, [13][14][15][16] functionalized cellulose, 17,18 knotted reactor, [19][20][21][22] modified alumina, [23][24][25][26] silica gel modified with glycerol, 27 and C-60 fullerene. 12 Among these solid phase sorbents, a good alternative to achieve very versatile systems that can be applied to a wide range of samples is the use of polymeric solid supports functionalized with complexing reagents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and application of a functionalized polystyrene resin for on-line preconcentration and determination of cobalt(II) in water samples by flow injection/FAAS

Chamjangali

Sharif-Razavian

Bahramian

2010

J. Braz. Chem. Soc.

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Foi desenvolvido um método simples e sensível de espectrometria de absorção atômica em chama com injeção por fluxo para a pré-concentração em linha e determinação de níveis traço de cobalto(II). Uma mini-coluna empacotada com poliestireno clorometilado e funcionalizado com N,N-bis(naftilidenoimina)dietilenotriamina (PS-NAPdien) foi utilizada para o enriquecimento em sistema de fluxo de cobalto(II) a partir de amostras em pH 7.0. Todas as variáveis químicas e de fluxo foram otimizadas. Sob condições ótimas, o gráfico de calibração foi linear na faixa de concentração de 1.0-80.0 e 0.30-0.40 µg L -1 para a pré-concentração de volumes de soluções de 10.0 e 20.0 mL, respectivamente. Os valores de limites de detecção para a pré-concentração de amostras para volumes de 10.0 e 20.0 mL foram 0.75 e 0.25 µg L -1 , respectivamente. Um fator de enriquecimento de 110 para um volume de amostra de 10.0 mL foi obtido. Os desvios padrão relativos para 10 replicatas de cobalto(II) nos níveis de 10.0 e 60.0 µg L -1 foram 4.7 e 3.3%, respectivamente. A exatidão do método proposto foi demonstrada a partir da determinação de Co(II) em diferentes amostras de água usando experimentos de adição e recuperação.A simple and sensitive flow injection-flame atomic absorption spectrometric (FI-FAAS) method was developed for on-line preconcentration and determination of trace levels of cobalt(II). A mini-column packed with a chloromethylated polystyrene, functionalized with N,N-bis(naphthylideneimino)diethylenetriamine (PS-NAPdien) was used for on-line enrichment of cobalt (II) , respectively. An enrichment factor of 110 for a sample volume of 10.0 mL was obtained. The relative standard deviations for 10 replicate determinations of cobalt(II) at the 10.0 and 60.0 µg L -1 levels were 4.7 and 3.3%, respectively. The accuracy of the proposed method was demonstrated by determining Co(II) in different spiked water samples.Keywords: flame atomic absorption spectrometry, on-line preconcentration, flow injection, polystyrene, cobalt(II) IntroductionCobalt is an essential element for humans and animals because it is associated with the synthesis of vitamin B 12 . On the other hand, cobalt is also classified as an environmental toxin. It can harm the natural environment, even at low concentrations, through its inherent toxicity and its tendency to accumulate in the food chain. Therefore, it is clear that the determination of trace amounts of cobalt in biological and environmental samples plays an important role in the fields of environmental surveillance, food control, medicine and toxicology.Atomic spectrometric methods are extensively employed for the quantification of metal species.1 In particular, FAAS has been one of the most applied methods for the determination of inorganic elements in a variety of samples.2 However, its main problem is the low sensitivity for some elements at the µg L -1 level. To improve FAAS sensitivity and selectivity, preconcentration procedures are frequently required. Solid phase extraction (SPE) has found increasing appl...

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Glycerol–silica gel: A new solid sorbent for preconcentration and determination of traces of cobalt(II) ion

Cited by 60 publications

References 33 publications

Preparation of xylenol orange functionalized silica gel as a selective solid phase extractor and its application for preconcentration—separation of mercury from waters

Preparation of xylenol orange functionalized silica gel as a selective solid phase extractor and its application for preconcentration—separation of mercury from waters

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

Synthesis and application of a functionalized polystyrene resin for on-line preconcentration and determination of cobalt(II) in water samples by flow injection/FAAS

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