Formic acid solubilization of marine biological tissues for multi-element determination by ETAAS and ICP–AES

Scriver, Christine; Kan, Masahiko; Willie, Scott; Soo, Catherine; Birnboim, H.C.

doi:10.1007/s00216-005-3125-4

Cited by 38 publications

(37 citation statements)

References 25 publications

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“…Biological samples were treated with formic acid for their solubilization based on the procedure described by Vieira et al 14 and Scriver et al 33 For this procedure, approximately 250 mg of samples were weighed into polyethylene flasks and 10 mL of 82.0% (v/v) HCOOH was added. The mixture was then placed in an ultrasonic bath at 40 °C for approximately 3 h to accelerate the solubilization process.…”

Section: Sample Preparation Proceduresmentioning

confidence: 99%

Determination of Hg in Biological Samples and Ethanol Fuel by Photochemical Vapor Generation after Pre-Concentration in a Gold Trap

Oreste¹,

Oliveira²,

Ribeiro³

et al. 2017

J. Braz. Chem. Soc.

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In this work, the photochemical vapor generation (PVG) coupled with atomic absorption spectrometry and a pre-concentration step with an Au column was used for the determination of Hg in biological samples and ethanol fuel. PVG with pre-concentration showed an up to 250-fold higher sensitivity compared to the approach without pre-concentration. The accuracy of analysis of biological samples was evaluated using certified reference materials (fish tissues), while for ethanol fuel samples, recovery tests were employed (91%). Analytical curves were linear (R > 0.99) in the studied range of 2.5 to 10 μg L -1 for conventional PVG and 0.2 to 0.5 μg L -1 for PVG with the pre-concentration step. For the last, the limits of detection reached for biological samples and ethanol fuel were 0.02 and 0.01 μg L -1 , respectively. The systems presented are simple, sensitive and safe for the control of low Hg concentrations in different samples. However, only the system using pre-concentration with an Au column was capable of obtaining the reproduced signals of Hg in low concentrations of the order of 0.2 μg L -1 .

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Section: Sample Preparation Proceduresmentioning

confidence: 99%

Determination of Hg in Biological Samples and Ethanol Fuel by Photochemical Vapor Generation after Pre-Concentration in a Gold Trap

Oreste¹,

Oliveira²,

Ribeiro³

et al. 2017

J. Braz. Chem. Soc.

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“…Calibration solutions of Al, As, Ba, Co, Cr, Cu, Mn, Mo, Ni, Pb, Se, Sr, V and Zn were prepared by serial dilution of high purity 1000 mg kg -1 commercial standards (SCP Science, Montreal, Canada) with DIW containing 1% HNO 3 .…”

Section: Reagents and Solutionsmentioning

confidence: 99%

“…One such approach is treatment of samples with formic acid. [3][4][5][6] Formic acid has also been explored as a reagent to promote photochemical vapor generation (PVG), [7][8][9][10][11] thereby permitting more efficient introduction of gaseous analytes into spectrochemical sources to improve detection limits.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Use of Formic Acid for Extraction of Trace Elements from Brazil Nut and Babassu Coconut and Its Suitability for Multi-Element Determination by ICP-MS

Lopes¹,

Silva²,

Grinberg³

et al. 2016

Journal of the Brazilian Chemical Society

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Formic acid extractions of Brazil nut and babassu coconut samples were undertaken prior to determination of Al, As, Ba, Co, Cr, Cu, Mn, Mo, Ni, Pb, Se, Sr, V and Zn in their meat and oil portions by inductively coupled plasma mass spectrometry (ICP-MS) in an effort to accomplish a first order fractionation of the trace elements between these two components. An optimized full factorial design was applied to establish the best conditions for extraction. Microwave-assisted nitric acid digestions of samples and fractions along with analysis of certified reference material TORT-2 established the efficiency of recovery of the trace elements as well as provided a verification of accuracy. The multiple responses were analyzed using a desirability function wherein the recovery of the trace elements by extraction was compared with the determination of the total content as determined by nitric acid digestion. Although most trace elements presented a recovery higher than 85% using a formic acid extraction, Al suffered consistently low results for all samples (40-50%). Except for Al and Cr, the majority of the trace elements were present in the defatted fraction of both samples, i.e., Al (50 and 10%), Cr (86 and 60%), Ni (30 and 10%) and Sr (8 and 20%) in Brazil nut and babassu coconut oil fractions, respectively.

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“…Amostras de carne foram solubilizadas em meio de HCOOH segundo o método descrito por Scriver et al, 18 porém, a metodologia foi adaptada ao sistema em microescala: aproximadamente 10 mg de amostra foram pesados diretamente em frascos de polipropileno de 50 mL, seguido da adição de 200 µL de HCOOH. Em seguida, a mistura foi colocada em um banho de ultrassom a 70 ºC por um período de 2-3 h. Após o resfriamento, o volume foi completado a 50 mL com água deionizada para as subsequentes análises.…”

Section: Procedimento 3 -Microssolubilização Com áCido Fórmico (Hcooh)unclassified

Avaliação de tratamentos da amostra em microescala para a determinação de K, Mg, Na e Zn em carnes por técnicas de espectrometria atômica

et al. 2013

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Recebido em 28/9/12; aceito em 19/2/13; publicado na web em 15/4/13 EVALUATION OF SAMPLE TREATMENT IN MICRO-SCALE FOR THE DETERMINATION OF K, Mg, Na AND Zn IN MEAT BY ATOMIC SPECTROMETRY TECHNIQUES. This paper describes the development of methods in micro-scale for the determination of K, Mg, Na and Zn in meat by atomic spectrometry techniques. The limits of detection (LOD) for K and Na by microdigestion were 0.18 and 0.20 mg g -1 , respectively whereas LOD for Mg and Zn by microsolubilization with TMAH were 2.40 and 18.4 µg g -1 , respectively. The RSD values were lower than 6.0% and the CRMs analyzed showed values with 95% agreement. The proposed methods are simple, fast and use small amounts of sample (around 10 mg) yet do not require special equipment for sample preparation.Keywords: meat; sample preparation; atomic spectrometry techniques. INTRODUÇÃOAs carnes, em geral, são fontes importantes de proteínas, lipídios, vitaminas lipossolúveis e minerais como Zn e Mg, os quais são considerados minerais essenciais para o organismo humano, exercendo funções importantes como a participação em várias reações celulares e também são requeridos como cofatores em diversos sistemas enzimáticos dos processos metabólicos. 1 Contudo, atualmente, tem-se evidenciado um crescimento do mercado de produtos processados à base de carne, já que a produção de alimentos de fácil preparo se faz cada vez mais necessária, visto o ritmo acelerado da vida cotidiana. Entretanto, no decorrer do processamento industrial, a disponibilidade, bem como perdas e ganhos de nutrientes essenciais pode ser afetada, o que irá alterar a qualidade nutricional do alimento. [2][3][4] Além disso, a conservação das carnes, bem como de outros alimentos processados, normalmente é feita pela adição de sais de Na, principalmente o cloreto de sódio (NaCl), já que este atua na minimização da ação de agentes naturais (enzimas ou micro-organismos), aumentando a vida de prateleira dos alimentos. 5,6 Tendo em vista que, quantidades excessivas de Na estão sendo associadas ao desenvolvimento de doenças cardiovasculares, iniciativas estão sendo feitas pelo Brasil, bem como por parte dos principais países, para redução da adição de NaCl nos alimentos. Em contrapartida, como o K atua de forma efetiva em conjunto com o Na para manter o equilíbrio hídrico do organismo humano, facilitando as perdas de águas que estão diretamente associadas à eliminação de íons Na + , um aumento das concentrações de K na dieta pode proteger contra a hipertensão. Deste modo, sabe-se que o ideal seria encontrar quantidades semelhantes de Na e K nos alimentos em geral. [7][8][9] O controle de metais como Na, K, Mg e Zn, bem como os principais nutrientes contidos nos alimentos cárneos, é de suma importância para garantir a qualidade nutricional e toxicológica destes produtos. Uma vez que os métodos convencionais de análise são em sua maioria morosos e mais propensos a contaminações, faz-se necessário o desenvolvimento de métodos rápidos e simples, com a utilização de pequenas quantidades de amos...

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Formic acid solubilization of marine biological tissues for multi-element determination by ETAAS and ICP–AES

Cited by 38 publications

References 25 publications

Determination of Hg in Biological Samples and Ethanol Fuel by Photochemical Vapor Generation after Pre-Concentration in a Gold Trap

Determination of Hg in Biological Samples and Ethanol Fuel by Photochemical Vapor Generation after Pre-Concentration in a Gold Trap

An Evaluation of the Use of Formic Acid for Extraction of Trace Elements from Brazil Nut and Babassu Coconut and Its Suitability for Multi-Element Determination by ICP-MS

Avaliação de tratamentos da amostra em microescala para a determinação de K, Mg, Na e Zn em carnes por técnicas de espectrometria atômica

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