Study on the solid phase extraction and spectrophotometric determination of cobalt with 5-(2-benzothiazolylazo)-8-hydroxyquinolene

Amin, Alaa S.

doi:10.1016/j.arabjc.2010.12.008

Cited by 31 publications

(23 citation statements)

References 27 publications

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“…A comparison of the proposed procedure with other preconcentration systems which use various adsorbents for the determination of cobalt can be seen in (Table 6). Analytical features such as detection range, detection limits and precision are comparable to the methods presented in the literature [37,38,40,42,44,[46][47][48][49].…”

Section: Comparison With Other Methodsmentioning

confidence: 60%

Determination of Cobalt in Soils and Natural Waters Using Silica Gel Modified with Polyhexamethylene Guanidine and Nitroso-N-Salt

2018

AMSE

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Highly sensitive and simple method was developed for preconcentration and determination of trace amounts of cobalt in natural waters and soils using diffuse reflectance spectroscopy was developed. Method is based on the application of the new sorbent -silica gel sequentially modified with polyhexamethylene guanidine and 2-nitroso-1-naphthol-4-sulfonic acid sodium salt (nitroso-N-salt). Optimal conditions of solid-phase extraction of cobalt (II) such as stirring time, pH and volume of the solution, surface concentration of the reagent were determined. During sorption, intensively colored complex of cobalt (III) with nitroso-N-salt, that have a stripe in diffuse reflectance spectrum with maximum at 530 nm, was formed. Sorption-photometric method of cobalt determination directly in the sorbent phase by the color of its complex with nitroso-N-salt using diffuse reflectance spectroscopy was developed. The linearty of calibration curve depended on the surface concentration of nitroso-N-salt. For the surface concentration of nitroso-N-salt of 2.8 µmol g -1 the linearty was maintained in the concentration range of 0.05 -5.0 µg Co per 0.100 g of the sorbent, or 0.005 -0.50 µg mL -1 if the sorption was carried out from 10 mL of the solution. As the surface concentration of the reagent decreased, the range of linearty of the calibration curve narrowed. The detection limit was calculated as 0.01 μg per 0.100 g of the sorbent (or 1 ng mL -1 if the sorption was carried out from 10 mL of the solution) and didn't depend on the surface concentration of the reagent. Method was applied to the determination of cobalt in natural waters and soils. The accuracy of the results was confirmed by inductively coupled plasma optical emission spectroscopy and recovery test of spiked samples.In order to investigate desorption of the organic reagent SiO 2 -PHMG-NNS was treated with 0.001 -6.0 mol L -1 solutions of HCl, HNO 3 , or NaCl.

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Section: Comparison With Other Methodsmentioning

confidence: 60%

Determination of Cobalt in Soils and Natural Waters Using Silica Gel Modified with Polyhexamethylene Guanidine and Nitroso-N-Salt

2018

AMSE

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“…42) lter paper before analysis. 2,34 Vitamin B 12 samples. Five different brands of vitamin B 12 samples were purchased from pharmaceutical drug stores in Khon Kaen, Thailand.…”

Section: Sample Preparationmentioning

confidence: 99%

Vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction for sensitive spectrophotometric determination of cobalt

2018

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This study describes the development of vortex-assisted low density solvent and surfactant based dispersive liquid-liquid microextraction (VALS-DLLME) for Co(II) prior to its spectrophotometric detection. The method consisted of the complexation of Co(II) with pyrocatechol violet (PV) followed by the preconcentration of the Co(II)-PV complex using VALS-DLLME and then an absorption measurement at 600 nm. The optimum conditions for complex formation were a 1 : 3 mole ratio of Co(II) and PV at pH 7.5, while the conditions for VALS-DLLME were 300 mL 1-dodecanol as extraction solvent, and 300 mL acetonitrile as dispersive solvent under a vortex for 20 s with the addition of cationic surfactant (0.02 mmol L À1 CTAB). Under the optimum conditions, good linearity was in the range of 0.1-10 mg L À1 , the enrichment factor (EF) was 13.5 and the low limit of detection (LOD) was 0.04 mg L À1 . The method was applied to the analysis of Co(II) in water, green leaf vegetable and vitamin B 12 samples. The proposed method provided good recoveries in the range of 86-104%, which were comparable to those obtained from flame atomic absorption spectrophotometry. Results and discussionOptimization for the formation of Co(II)-PV complex Absorption spectra. The Co(II)-PV complex has blue color with the maximum absorption wavelength at 590 nm, while PV is yellow color with the maximum absorption wavelength at 7244 | RSC Adv., 2018, 8, 7243-7251 This journal is Fig. 1 (a) Absorption spectra of Co(II)-PV complex at different concentrations of Co(II) obtained from direct analysis (left) and with VALS-DLLME (right). Conditions of complexation: molar ratio (Co(II) : PV) of 1 : 3, phosphate buffer pH 7.5. Condition of VALS-DLLME: 300 mL 1-dodecanol, 0.02 mmol L À1 CTAB, 300 mL acetonitrile, 0.2 g Na 2 SO 4 , vortex at 3200 rpm for 40 s. (b) Effect of the PV concentration. Conditions: 1.00 mg L À1 Co(II) and phosphate buffer pH 7.5. (c) Effect of pH. Conditions: 1.00 mg L À1 Co(II) and 0.06 mmol L À1 PV in phosphate buffer.This journal is

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“…36,40,42,44,45,51,53 Todos estes empecilhos, relacionados a procedimentos manuais, podem ser superados ao empregar sistemas de análise em fluxo. 41,43,51,52,58 Na literatura é visto diferentes metodologias para a determinação de cobalto, empregando espectrofotometria em conjunto com a análise em fluxo e em processos manuais.…”

Section: Métodos Analíticos Para Determinação De Cobaltounclassified

“…32,35,34,40,42,43,44 As principais fontes de exposição de cobalto aos seres humanos são por vias respiratória, dérmica ou por meio da dieta (água e alimentos contaminados). 32,34,38,45 A absorção do cobalto pelo trato gastrointestinal e pela via respiratória é proporcional à solubilidade dos compostos de cobalto em meio biológico. 34 As indústrias são a principal fonte de contaminação ao lançar cobalto no ambiente, por volta de 30% para as indústrias de cerâmica e de tintas.…”

Section: Introductionunclassified

“…34 As indústrias são a principal fonte de contaminação ao lançar cobalto no ambiente, por volta de 30% para as indústrias de cerâmica e de tintas. 38,45 As legislações de controle para os valores permitidos de cobalto em alimentos, águas e ar são elaboradas de acordo com cada país. Nos Estado Unidos, O cobalto apresenta duas zonas de exposição para a vida em que o excesso ou a falta deste elemento pode ocasionar prejuízos a saúde ou até mesmo a morte.…”

Section: Introductionunclassified

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Desenvolvimento de procedimentos analíticos limpos empregando multicomutação em sistemas de análises em fluxo para determinação fotométrica de cobalto e cádmio em águas

Gondim¹

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AGRADECIMENTOSAgradeço a Deus pela oportunidade de continuar a viver e conquistar este sonho. A vida é cheia de mistérios que só Ele é capaz de entender. Tenho fé e esperança que Ele me guiará pelos melhores caminhos nos momentos mais difíceis de minha vida. Minha conquista é dedicada a Ele.Agradeço a todos que participaram e colaboraram na realização deste trabalho. Este foi mais um sonho conquistado após muito suor, trabalho, dedicação e abnegação de momentos pessoais e familiares.Agradeço a minha família que sempre acreditou que eu era capaz e nunca me deixou fraquejar. A meus pais, irmãos e sobrinhos pelas palavras de incentivo e amor e por perdoarem minha ausência nos momentos de alegrias e tristezas. Minha família é meu porto seguro. A meu marido Marco pelo carinho e apoio, por estar sempre presente, pelo amor e dedicação ao nosso lar e a nossa família. Sem você este sonho nunca teria se tornado realidade. Você foi e é um companheiro maravilhoso.A minha amiga Lidiane Patricia (Lidi) por todo o carinho, ajuda e ouvidos durante esta tese.Ao meu mestre, Boaventura, por todos os ensinamentos, pela paciência e dedicação. O senhor foi fundamental em meu crescimento profissional.Aos professores Fábio Rocha, Francisco Krug, Elias Zagatto, Maria Fernanda pela disponibilidade do conhecimento.Ao Centro de Energia Nuclear na Agricultura (CENA) por ter me recebido de portas abertas e pela formação acadêmica.Ao Instituto de Química de São Carlos (IQSC) pela formação acadêmica, apoio estudantil e a CAPES pela concessão da bolsa.Aos funcionários do CENA e do IQSC pela disponibilidade e atenção durante minha permanência como aluna e execução deste trabalho.Aos técnicos Valdemir, Iolanda e Fátima pela colaboração no desenvolvimento deste trabalho.A técnica, amiga e um pouco mãe, Sheila Roberta, pelo apoio no desenvolvimento do trabalho, pelo carinho e por todos os puxões de orelha. Seu carinho é insubstituível.Aos companheiros e colegas de laboratório pela amizade, troca de experiências e conselhos acadêmicos.

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Study on the solid phase extraction and spectrophotometric determination of cobalt with 5-(2-benzothiazolylazo)-8-hydroxyquinolene

Cited by 31 publications

References 27 publications

Determination of Cobalt in Soils and Natural Waters Using Silica Gel Modified with Polyhexamethylene Guanidine and Nitroso-N-Salt

Determination of Cobalt in Soils and Natural Waters Using Silica Gel Modified with Polyhexamethylene Guanidine and Nitroso-N-Salt

Vortex-assisted low density solvent and surfactant based dispersive liquid–liquid microextraction for sensitive spectrophotometric determination of cobalt

Desenvolvimento de procedimentos analíticos limpos empregando multicomutação em sistemas de análises em fluxo para determinação fotométrica de cobalto e cádmio em águas

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