Determination of cobalt in biological samples by line-source and high-resolution continuum source graphite furnace atomic absorption spectrometry using solid sampling or alkaline treatment

Ribeiro, Anderson Schwingel; Vieira, Mariana Antunes; Silva, Alessandra Furtado da; Borges, Daniel L. G.; Welz, Bernhard; Heitmann, Uwe; Curtius, Adilson José

doi:10.1016/j.sab.2005.01.002

Cited by 50 publications

(32 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this context, simple alternatives to avoid these potential problems include the direct analysis of solid samples or the use of slurry sampling, which significantly reduces the time required for sample preparation and the use of corrosive and hazardous reagents. 18,19 However, this kind of procedure is not used for routine analysis and is still a relatively new approach in areas in which the analyses are not carried out by analytical chemists. Regarding the slurry sampling, the methods involved are particularly attractive because they combine advantages of the direct sampling (ease to prepare, no requirement of aggressive chemical treatments, less susceptibility to contamination and reduction of analyte losses before analysis) with the liquid sampling facilities, allowing the use of aqueous standards for calibration curves.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

Silva¹,

Nunes²,

Oreste³

et al. 2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Foram avaliados dois métodos diferentes de preparo de amostras de carnes baseados na solubilização em meios alcalino ou ácido. O objetivo deste estudo foi determinar os teores de Na e K após solubilização com hidróxido de tetrametilamônio (TMAH) à temperatura ambiente, e com ácido fórmico e aquecimento em bloco de digestão a 50 ºC por cerca de 2 h. A solubilização alcalina se apresentou como uma metodologia simples e robusta e a melhor alternativa frente aos procedimentos de mineralização convencional, permitindo a solubilização completa das amostras usando pequenas quantidades de TMAH. O método foi validado empregando-se materiais de referência certificada assim como pela comparação com método de digestão convencional com ácido nítrico. Os limites de detecção obtidos foram de 0,8 e 2,0 mg g -1 para Na e K, respectivamente, e se mostraram adequados para o objetivo das análises.Two different sample preparation methods were evaluated for meat samples employing the solubilization in alkaline or acidic media. The aim of this study was to determine Na and K levels after sample solubilization with tetramethylammonium hydroxide (TMAH) at room temperature, and with formic acid and heating in a digester block at 50 ºC for ca. 2 h. The alkaline solubilization showed to be a simple and robust method and the better alternative in relation to the mineralization conventional procedures, allowing the complete solubilization of the samples even when small quantities of TMAH were used. The method was validated by using certified reference material as well as by comparing with samples digested with nitric acid. The limits of detection obtained were 0.8 and 2.0 μg g -1 for Na and K, respectively, and showed to be adequate for the analysis purposes.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

Silva¹,

Nunes²,

Oreste³

et al. 2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…The quantification of metal species in various matrices has been performed by different techniques, including flame atomic absorption spectrometry (FAAS) [4], graphite furnace atomic absorption spectrometry (GFAAS) [5] and inductively coupled plasma optical emission spectrometry (ICP-OES) [6], among others. However, these techniques do not have adequate sensitivity and selectiveity for some analyses.…”

Section: Introductionmentioning

confidence: 99%

Determination of Cobalt in Food, Environmental and Water Samples with Preconcentration by Dispersive Liquid-Liquid Microextraction

Ojeda¹,

Rojas

Pavón³

2012

AJAC

View full text Add to dashboard Cite

A new method for the determination of cobalt was developed by dispersive liquid-liquid microextraction preconcentration and flame atomic absorption spectrometry. In the proposed approach, 1,5-bis(di-2-pyridyl) methylene thiocarbohydrazide (DPTH) was used as a chelating agent, and chloroform and ethanol were selected as extraction and dispersive solvents. Some factors influencing the extraction efficiency of cobalt and its subsequent determination, including extraction and dispersive solvent type and volume, pH of sample solution, concentration of the chelating agent, and extraction time, were studied and optimized. Under the optimum conditions, a preconcentration factor of 8 was reached. The detection limit for cobalt was 12.4 ng·mL -1, and the relative standard deviation (RSD) was 3.42% (n = 7, c = 100 ng·mL -1 ). The method was successfully applied to the determination of cobalt in food, environmental and water samples.

show abstract

“…Since a review about alkaline solubilization was published by Nobrega et al 24 in 2006, many procedures for treating biological samples with TMAH were reported as an alternative to conventional digestion for the determination of metallic elements by atomic spectrometry methods. [24][25][26][27] This work describes the development of a fast and simple method for sample preparation of meat with TMAH for the determination of Ca, Cu, Fe and Mg by atomic absorption spectrometry. Calibration was carried out by using aqueous standards prepared in the presence of TMAH.…”

Section: Introductionmentioning

confidence: 99%

Determination of Ca, Cu, Fe and Mg in fresh and processed meat treated with tetramethylammonium hydroxide by atomic absorption spectrometry

Nunes¹,

Acunha²,

Oreste³

et al. 2011

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Um método simples para o tratamento de amostras de carne fresca e processada com hidróxido de tetrametilamônio (TMAH) é proposto para a determinação de Ca, Fe e Mg por espectrometria de absorção atômica com chama (FAAS) e Cu por espectrometria de absorção atômica com forno de grafite (GFAAS). A exatidão foi avaliada por comparação dos resultados usando outros dois procedimentos de preparo de amostra e por análise de materiais de referência certificados. Não houve diferença significativa entre os resultados obtidos, em um nível de confiança de 95%. Os limites de detecção para Ca, Cu, Fe e Mg foram 45,0, 0,2, 16,0 e 0,3 µg g -1 , respectivamente. A espectrometria de absorção atômica de alta resolução com fonte contínua em forno de grafite (HR-CS GFAAS) foi empregada para avaliar as interferências espectrais na determinação de Cu. Entretanto, nenhuma interferência foi encontrada. O método proposto é simples, rápido e confiável para análise de produtos cárneos e não requer o uso de equipamentos especiais nem de ácidos fortes no preparo das amostras.A simple method for treating fresh and processed meat with tetramethylammonium hydroxide (TMAH) is proposed for the determination of Ca, Fe and Mg by flame atomic absorption spectrometry (FAAS) and Cu by graphite furnace atomic absorption spectrometry (GFAAS). The accuracy was evaluated by comparison of the results by using two other sample preparation procedures and by the analysis of certified reference materials. No significant differences between the results were found at the 95% confidence level. Limits of detection for Ca, Cu, Fe and Mg were 45.0, 0.2, 16.0 and 0.3 µg g -1 , respectively. High-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GFAAS) was employed to evaluate the spectral interference in the determination of Cu. However, no interference was found. The proposed method is simple, fast and reliable for meat products analysis and does not require especial equipment, neither strong acid for sample preparation.

show abstract

Determination of cobalt in biological samples by line-source and high-resolution continuum source graphite furnace atomic absorption spectrometry using solid sampling or alkaline treatment

Cited by 50 publications

References 23 publications

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

Determination of Cobalt in Food, Environmental and Water Samples with Preconcentration by Dispersive Liquid-Liquid Microextraction

Determination of Ca, Cu, Fe and Mg in fresh and processed meat treated with tetramethylammonium hydroxide by atomic absorption spectrometry

Contact Info

Product

Resources

About