Direct determination of Cd, Pb and Cr in honey by slurry sampling electrothermal atomic absorption spectrometry

Andrade, Camila Kulek de; Anjos, Vanessa Egéa dos; Felsner, Maria Lurdes; Torres, Yohandra Reyes; Quináia, Sueli Pércio

doi:10.1016/j.foodchem.2013.09.065

Cited by 54 publications

(16 citation statements)

References 29 publications

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“…Essas análises foram realizadas com o intuito de verificar se existe interferência de matriz nas determinações de Cr. 18,20 Para a obtenção de cada curva analítica foram preparadas soluções padrão em duplicata com concentrações de 2, 4, 6, 8 e 10 µg L -1 . A linearidade das curvas analíticas foi verificada pela aplicação de regressão linear com análise de variância (ANOVA) e teste de falta de ajuste no nível de 95% de confiança.…”

Section: Estudo De Validação Do Métodounclassified

“…Dessa forma, optou-se por utilizar a suspensão aquosa de melado de cana, sem adição de HNO 3 , para a determinação de Cr por GF AAS, tornando a análise mais simples e com menor custo e menor risco de contaminações. 18 Para a obtenção da curva de pirólise, foram avaliadas temperaturas entre 1000 a 1700°C, sendo que a temperatura de atomização foi fixada em 2600°C. Com temperaturas de pirólise a partir de 1200°C foi observado um aumento na intensidade do sinal analítico, o qual permaneceu praticamente constante até 1600°C.…”

Section: Otimização Do Programa De Aquecimentounclassified

“…14 A amostragem em suspensão tem sido amplamente utilizada no preparo de diferentes tipos de amostra para a determinação de minerais, especialmente associada às técnicas de espectrometria de absorção atômica. [14][15][16][17][18] Andolfatto 19 utilizou a técnica de amostragem em suspensão para a determinação de Mn, Zn, Fe e Mg em melado de cana por FAAS, sendo que o método otimizado apresentou precisão e exatidão adequadas. Entretanto, a aplicação dessa técnica para a determinação de minerais em melado de cana ainda é escassa.…”

Section: Introductionunclassified

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Direct Determination of Chromium in Cane Syrup by GF AAS

Galvão¹,

Felsner²

2021

Rev. Virtual Quim.

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In this work, a slurry sampling method was used for chromium determination in cane syrup by GF AAS for the first time. The cane syrup slurries were prepared by dissolution of the samples with ultrapure water. Method validation was carried out by evaluating parameters such as linearity, detection and quantification limits, precision and accuracy. The analytical curve was prepared by external standardization and low values of detection and quantification limits were found (7.2 and 22.0 ng g-1 , respectively). The repeatability and intermediate precision estimates demonstrated that the method presents an adequate precision (RSD < 20%). The accuracy assessed by the recovery rates (102-113%) and the comparison with the reference method (p = 0.562) was also adequate. The validated method was applied to twenty cane syrup samples from different Brazilian states, whose chromium concentrations ranged from 29.8 to 254.1 ng g-1. Neste trabalho, um método de amostragem em suspensão foi utilizado para a determinação de cromo em melado de cana por GF AAS de forma inédita. As suspensões de melado foram preparadas pela dissolução das amostras com água ultrapura. A validação do método foi realizada pela avaliação de parâmetros como linearidade, limites de detecção e de quantificação, precisão e exatidão. A curva analítica foi preparada por padronização externa e baixos valores de limites de detecção e de quantificação foram encontrados (7,2 e 22,0 ng g-1 , respectivamente). As estimativas de repetitividade e de precisão intermediária demonstraram que o método apresenta uma precisão adequada (RSD < 20%). A exatidão avaliada por meio das taxas de recuperação (102-113%) e da comparação com método de referência (p = 0,562) também foi adequada. O método validado foi aplicado a 20 amostras de melado de cana de diferentes estados brasileiros, cujas concentrações de cromo variaram de 29,8 a 254,1 ng g-1 .

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Section: Estudo De Validação Do Métodounclassified

Section: Otimização Do Programa De Aquecimentounclassified

Section: Introductionunclassified

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Direct Determination of Chromium in Cane Syrup by GF AAS

Galvão¹,

Felsner²

2021

Rev. Virtual Quim.

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“…The matrix modification technique using chemical modifiers is a very important feature in the concept of trace metal determinations with very minimal interference. The chemical forms and therefore the physical properties of the element studied or the matrix can be changed by the addition of a suitable reagent (matrix modifier) in excess to the sample and standard reference solutions [ 36 , 65 , 66 , 67 , 68 ].…”

Section: Mineralsmentioning

confidence: 99%

Recent Techniques in Nutrient Analysis for Food Composition Database

et al. 2020

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Food composition database (FCD) provides the nutritional composition of foods. Reliable and up-to date FCD is important in many aspects of nutrition, dietetics, health, food science, biodiversity, plant breeding, food industry, trade and food regulation. FCD has been used extensively in nutrition labelling, nutritional analysis, research, regulation, national food and nutrition policy. The choice of method for the analysis of samples for FCD often depends on detection capability, along with ease of use, speed of analysis and low cost. Sample preparation is the most critical stage in analytical method development. Samples can be prepared using numerous techniques; however it should be applicable for a wide range of analytes and sample matrices. There are quite a number of significant improvements on sample preparation techniques in various food matrices for specific analytes highlighted in the literatures. Improvements on the technology used for the analysis of samples by specific instrumentation could provide an alternative to the analyst to choose for their laboratory requirement. This review provides the reader with an overview of recent techniques that can be used for sample preparation and instrumentation for food analysis which can provide wide options to the analysts in providing data to their FCD.

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“…sewage, rivers, or on lands, etc. Several technologies including thermal treatment, surface-enhanced Raman spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma optical emission spectrometry, precipitation, atomic absorption spectrometry (AAS), ion chromatography, flame AAS, extraction, square wave anodic stripping voltammetry, adsorption, UV-vis spectrometry, atomic fluorescence spectrometry, colorimetric analysis, and ion exchange have been proposed for the removal of these pollutants from the aquatic environment [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Among these techniques, ion exchange is one of the most common and effective treatment methods.…”

Section: Introductionmentioning

confidence: 99%

Ion-exchange kinetic studies for Cd(II), Co(II), Cu(II), and Pb(II) metal ions over a composite cation exchanger

Naushad

Mittal

Rathore

et al. 2015

Desalination and Water Treatment

246

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Explicit Nernst-Planck approximation is used to study the kinetics of H(I)-metal ion-exchange processes for ions having different effective diffusion coefficients, that is, for non-isotopic exchange process. Kinetic studies of four heavy metal ions (Cd 2+ , Co 2+ , Cu 2+ , and Pb 2+ ) of environmental importance on the surface of acetonitrile stannic(IV) selenite composite cation exchanger were carried out successfully. On the basis of kinetic studies, various physical parameters, that is, fractional attainment of equilibrium U(τ), self-diffusion coefficients (D o ), energy of activation (E a ), and entropy of activation (ΔS*) are estimated to evaluate the mechanism of ion exchange on the surface of composite ion-exchange material. The activation entropy and energy revealed that the greater degree and minimum energy was achieved during forward ion-exchange process. The results revealed that the kinetic studies are very important for the economic and industrial applications of ion-exchange materials.

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Direct determination of Cd, Pb and Cr in honey by slurry sampling electrothermal atomic absorption spectrometry

Cited by 54 publications

References 29 publications

Direct Determination of Chromium in Cane Syrup by GF AAS

Direct Determination of Chromium in Cane Syrup by GF AAS

Recent Techniques in Nutrient Analysis for Food Composition Database

Ion-exchange kinetic studies for Cd(II), Co(II), Cu(II), and Pb(II) metal ions over a composite cation exchanger

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