Atomic Absorption Determination of Cobalt after Preconcentration by 1-(2-Pyridylazo)-2-naphthol Immobilized on Surfactant-Coated Alumina

Manzoori, Jamshid L.; Sorouradin, Mohammad-Hussein; Shabani, Ali

doi:10.1006/mchj.1999.1793

Cited by 40 publications

(20 citation statements)

References 22 publications

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“…[8][9][10] A number of supports and chelating ligands have been widely used in the design of chelating resins for the preconcentration and separation of trace metal ions from various matrices. The most prominent among the supports used are Amberlite XAD resins, 11,12 silica gel, 13 activated carbon, 14 activated alumina, 15 sepiolite, 16 and related polymeric supports. 17,18 Some important and recently reported chelating matrices described using such supports are: silica gel modified with purpurogallin, 19 1-(2-pyridylazo)-2-naphthol, 20 3-aminopropyltriethoxysilane, 21 1,8-dihydroxyanthraquinone, 22 2-aminothiazole, 23 N-propylsalicylaldimine, 24 surfactant coated alumina modified with 1-(2-pyridylazo)-2-naphthol, 15 Amberlite XAD-2 modified with chromotropic acid, 25 alizarin red-S, 26 Nitroso R salt, 27 Amberlite XAD-4 modified with o-aminobenzoic acid, 28 N-hydroxyethylenediamine, 29 and Amberlite XAD-16 modified with 1-(2-thiazolylazo)-2-naphthol.…”

Section: Introductionmentioning

confidence: 99%

Preconcentration of trace elements by using 1-(2-Pyridylazo)-2-naphthol functionalized Amberlite XAD-1180 resin and their determination by FAAS

Tokalıoğlu

Büyükbas

Kartal

2006

J. Braz. Chem. Soc.

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Neste estudo foi sintetizada a resina Amberlite XAD funcionalizada por 1-(2-piridilazo)-2-naftol (PAN) e a resina resultante foi usada na pré-concentração dos íons Cr(III), Mn(II), Fe(III), Ni(II), Cu(II), Cd(II) e Pb(II) presentes em baixas concentrações em diferentes amostras. Para isso, o copolímero foi nitrado, reduzido à correspondente amina, convertido ao sal diazonato com nitrito e em reação com PAN produziu a resina complexante XAD-1180-PAN. Para o método descrito, parâmetros analíticos para recuperação dos elementos traço foram avaliados tais como, pH, volume da amostra, quantidade de resina, vazão de retenção e remoção, volume e tipo de eluente. Os metais retidos na resina XAD-1180-PAN foram eluídos com HNO 3 2 mol L -1 . A influência dos íons presentes na matriz, ou seja, Na(I), K(I), Ca(II) e Mg(II), sobre a recuperação dos elementos traço também foi avaliada, quando presentes isoladamente ou em conjunto. A repetibilidade do método foi avaliada nas condições experimentais ótimas estabelecidas. Os valores de recuperação, para todos os elementos, exceto o Cr(III), foram ≥92% e os desvios padrão relativos ≤8.5%. In this study, Amberlite XAD-1180 resin functionalized by 1-(2-pyridylazo)-2-naphthol (PAN) was synthesized and the resulting resin was used for preconcentration of Cr(III), Mn(II), Fe(III), Ni(II), Cu(II), Cd(II) and Pb(II) elements present at trace levels in different matrices. For this purpose, the copolymer was nitrated, reduced to the corresponding amine, converted to the diazonium salt with nitrite and reacted with PAN to produce the XAD-1180-PAN chelating resin. For the described method, the effect of some analytical parameters, such as pH, sample volume, resin amount, flow rates of uptake and stripping, volume and type of eluent, on the recovery of the trace elements was investigated. The metals retained on the XAD-1180-PAN resin were eluted by 2 mol L -1 HNO 3 . The influence of matrix ions, i.e., Na(I), K(I), Ca(II) and Mg(II), on the recovery of trace elements was also examined by using the developed method when they occurred both individually and together. The repeatability of the method at the optimum conditions determined experimentally was investigated. The recovery values for all the elements, except for Cr(III), were found to be ≥92% and the relative standard deviation was ≤8.5%. The 3s/b detection limits for Cr(III), Mn(II), Fe(III), Ni(II), Cu(II), Cd(II) and Pb(II) were found to be 4.1, 0.13, 2.7, 1.2, 0.19, 0.06 and 0.13 μg L -1 , respectively. The developed method was utilized for preconcentration and determination of Mn(II), Fe(III), Ni(II), Cu(II), Cd(II) and Pb(II) in tap water, rain water, and stream water, and of Ni(II), Cd(II) and Pb(II) in a certified reference material (RM 8704 Buffalo river sediment) by flame atomic absorption spectrometry (FAAS).

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Section: Introductionmentioning

confidence: 99%

Preconcentration of trace elements by using 1-(2-Pyridylazo)-2-naphthol functionalized Amberlite XAD-1180 resin and their determination by FAAS

Tokalıoğlu

Büyükbas

Kartal

2006

J. Braz. Chem. Soc.

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“…Urine analysis is often used for monitoring environmental and occupational exposure to trace elements because urine is the most readily available biological fluid, and most trace elements are mainly extracted via urine. 2 Several analytical techniques, such as atomic absorption spectrometry (AAS), [4][5][6][7] inductively coupled plasma-atomic emission spectrometry (ICP-AES) 8 and inductively coupled plasma-mass spectrometry (ICP-MS) 9 are available for the determination of trace metals with sufficient sensitivity for most applications. However, the determination of trace metal ions in urine samples is difficult due to various factors, particularly their low concentrations and matrix effects.…”

Section: Introductionmentioning

confidence: 99%

Sensitive and Simple Cloud-point Preconcentration Atomic Absorption Spectrometry: Application to the Determination of Cobalt in Urine Samples

Manzoori

Karim‐Nezhad

2003

ANAL. SCI.

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A new approach for developing a cloud-point extraction-flame atomic absorption spectrometric method has been described and used for the determination of cobalt. In this approach, water was removed from the final diluted surfactant rich phase obtained in cloud-point extraction procedure. The results indicated that removing water from this phase increased the enhancement factor by 4-fold. 1-(2-Pyridylazo)-2-naphthol (PAN) and octylphenoxypolyethoxyethanol (Triton X-114) were used as a hydrophobic ligand and a nonionic surfactant, respectively. The chemical variables affecting the preconcentration step were optimized. The effect of the water concentration in the final diluted methanolic surfactant solution on the analytical signal was investigated. The results showed that the analytical signal decreased by 30% and 52% in 15% and 25% water concentrations in methanol, respectively. An enhancement factor of 115 was obtained for cobalt extracted from only 10 ml of a sample. The detection limit obtained under the optimal condition was 0.38 µg l -1 . The proposed procedure was applied to the determination of cobalt in urine samples.

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“…It is a component of vitamin B 12 (cyanocobalamin), which is involved in the production of the blood red cells and the prevention of pernicious anemia. 1,2 Cobalt toxicity is quite low compared to many other metals.…”

Section: Introductionmentioning

confidence: 99%

“…20, No. 5, 2009 for the separation and preconcentration of cobalt, including liquid-liquid extraction, 9,10 solid phase extraction, 11,12 coprecipitation, 13 and flotation. 14 In recent years, cloud point extraction (CPE) has become one of the most popular methods used in the separation and enrichment of metal ions.…”

Section: Introductionmentioning

confidence: 99%

Flame atomic absorption spectrometric determination of trace amounts of cobalt after cloud point extraction as 2-[(2-Mercaptophenylimino)methyl]phenol complex

Baghban¹,

Shabani²,

Dadfarnia³

et al. 2009

J. Braz. Chem. Soc.

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Um procedimento de extração no ponto nuvem (CPE) foi desenvolvido para a separação e pré-concentração de baixas concentrações de cobalto previamente à determinação por espectrometria de absorção atômica em chama (FAAS). O procedimento é baseado na formação do complexo de Co(II) com 2-[(2-mercaptofenilimino)metil]fenol (MPMP), seguido pela extração em fase rica em surfactante Triton X-114. Alguns parâmetros importantes que afetam a complexação e extração, tais como pH, concentrações do agente quelante e do surfactante, temperatura e tempo de equilíbrio, foram otimizados. Sob condições ótimas, a pré-concentração de um volume de 25 mL da amostra resultou em um limite de detecção de 0,21 µg L -1 , um fator de enriquecimento de 97 e um desvio padrão relativo de 1,2% (n = 8, 60 µg L -1 ) para a determinação de Co(II) por FI-FAAS. O método foi aplicado com sucesso para amostras de água, vitamina B 12 e ampolas de complexo B. A exatidão do método foi comprovada por experimentos de adição-recuperação, análise independente por espectrometria de absorção atômica com forno de grafite e determinação de Co em material de referência certificado.A cloud point extraction (CPE) procedure was developed for the separation and preconcentration of trace amounts of cobalt prior to its determination by flame atomic absorption spectrometry (FAAS). The procedure is based on the formation of Co(II) complex with 2-[(2-mercaptophenylimino) methyl]phenol (MPMP) followed by its extraction into a Triton X-114 surfactant-rich phase. Some important parameters affecting both complexation and extraction, such as pH, concentrations of chelating agent and surfactant, temperature, and time of equilibration, were optimized. Under optimum conditions, the preconcentration of a volume of 25 mL of sample resulted in a limit of detection of 0.21 µg L -1, an enhancement factor of 97, and a relative standard deviation of 1.2 % (n = 8, 60 µg L -1 ) for the determination of Co(II) by FI-FAAS. This procedure was successfully applied to water, vitamin B 12 and B-complex samples. The accuracy was assessed employing addition-recovery experiments, independent analysis by graphite furnace atomic absorption spectrometry and by using a certified reference material.

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Atomic Absorption Determination of Cobalt after Preconcentration by 1-(2-Pyridylazo)-2-naphthol Immobilized on Surfactant-Coated Alumina

Cited by 40 publications

References 22 publications

Preconcentration of trace elements by using 1-(2-Pyridylazo)-2-naphthol functionalized Amberlite XAD-1180 resin and their determination by FAAS

Preconcentration of trace elements by using 1-(2-Pyridylazo)-2-naphthol functionalized Amberlite XAD-1180 resin and their determination by FAAS

Sensitive and Simple Cloud-point Preconcentration Atomic Absorption Spectrometry: Application to the Determination of Cobalt in Urine Samples

Flame atomic absorption spectrometric determination of trace amounts of cobalt after cloud point extraction as 2-[(2-Mercaptophenylimino)methyl]phenol complex

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