scholarly journals Atomic Absorption Spectrometry as an Alternative to Determine the Presence of Gold Nanoparticles on or in Silica Matrix

2022 ◽  
Author(s):  
Cristian Giertyas ◽  
Victor Silva ◽  
Maria de Oliveira ◽  
Emerson Freire ◽  
Josué Santos ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Silica Matrix ◽  
Emission Spectrometry ◽  
Sample Treatment ◽  
Plasma Atomic Emission Spectrometry ◽  
Flame Atomic Absorption ◽  
Vis Spectroscopy

Two different gold-silica-based nanomaterials were prepared: (i) silica-supported gold nanoparticles (AuNP/SiO2); and (ii) gold-silica core-shell nanoparticles (AuNP@SiO2). Three strategies for sample treatment (S), consisting in acid treatments, were employed: (S1) HNO3; (S2) HNO3 + HCl; and (S3) HF + HNO3 + HCl, applying microwave oven digestion for S2 and S3. From three calibration curves, slope, intercept, and linear correlation coefficient were obtained. The accuracy of the methods was evaluated by comparing the gold contents in a sample determined by flame atomic absorption spectrometry (FAAS) and by inductively coupled plasma atomic emission spectrometry (ICP-OES). Finally, the amount of gold for all samples was determined by FAAS. UV-Vis spectroscopy and transmission electron microscopy (TEM) were used to compare the material before and after sample treatment. By comparison, the application of S2 and S3 allowed the presence of gold on or in the silica matrix to be determined and the amount quantified.

scholarly journals Extracción secuencial de plomo y vanadio en sedimentos del río Catatumbo utilizando FAAS, ETAAS e ICP-AES

2016 ◽  
Vol 1 (1) ◽  
pp. 13
Author(s):  
Julio Cesar Torres Puentes ◽  
Marinela Colina ◽  
Yulixis Nohemi Cano de Torres
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Inductively Coupled Plasma ◽  
Exact Result ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Acid Digestion ◽  
Plasma Atomic Emission Spectrometry ◽  
Flame Atomic Absorption ◽  
Del Rio

Se presenta la evaluación del procedimiento de extracción secuencial aprobado por la BCR (BCR, por sus siglas en inglés, Community Bureau of Reference) para determinar metales en muestras de sedimentos del río Catatumbo, Venezuela. Las fracciones consistieron en 4 etapas: en la primera, llamada intercambiable, se extrajo utilizando ácido acético; la segunda, o reducible, con hidroxicloruro de amonio; la tercera, u oxidable, con peróxido de hidrógeno y acetato de amonio y la residual, que es la etapa remanente, se digirió con agua regia. El análisis se realizó por espectrometría de absorción atómica con llama (FAAS), horno de grafito (ETAAS) y espectrometría de emisión atómica con plasma inductivamente acoplado (ICP-AES). Los metales determinados fueron Pb y V. Las determinaciones por FAAS, ETAAS e ICP-AES indicaron que no hubo diferencias estadísticamente significativas (p < 0,05) cuando se compararon los resultados de 24 muestras de sedimentos del río Catatumbo realizadas por triplicado. La exactitud encontrada sumando las cuatro etapas de la BCR para Pb y V fueron comparables a los resultados obtenidos por digestión ácida, lo cual indica que el procedimiento es adecuado para la cuantificación de los metales estudiados. El Pb y V se encontró mayormente (55-97 %) en la etapa residual lo que los hace no disponibles. Palabras clave: digestión ácida, extracción BCR, sedimento, plomo, vanadio  Abstract: The aim of the present work is the evaluation of the procedure of sequential extraction approved by the BCR and used to determine metals in samples of sediments from Catatumbo River in Venezuela. The fractions consisted in four (4) stages: the first one or interchangeable was extracted using acetic acid, the second one or reducible with ammonia hydroxi-chloride, the third one or oxidable with hydrogen peroxide and ammonium acetate and the residual which is the remnant stage was digested with aqua regia. The analysis was made by Flame Atomic Absorption Spectrometry (FAAS), Electrothermal Atomisation Atomic Absorption Spectrometry (ETA-AAS) and Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The metals evaluated were Pb and V. The evaluations for FAAS, ETA-AS and ICP-AES indicated that there were not statistically significant differences (p <0.05) when the results of 24 samples of sediments from the Catatumbo River carried out in triplicate were compared. The exact result found by adding the four stages of the BCR for Pb and V were comparable to the results obtained by acid digestion. The Pb and V were found mainly (55-97 %) in the residual stage which makes them not available and these results are comparable to other studies published. Key words: Acid Digestion, Extraction of BCR, sediment, Pb, V 

scholarly journals A comparison of mineral elements content in conventional and organic milk from Southern Poland

2018 ◽  
Vol 114 (1) ◽  
pp. 137-150
Author(s):  
Michał Halagarda ◽  
Joanna Ptasińska-Marcinkiewicz ◽  
Kamil Fijorek
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Cow’S Milk ◽  
Organic Milk ◽  
Cow's Milk ◽  
Southern Poland ◽  
Flame Atomic Absorption

Milk is one of the most important foodstuffs and raw materials in the food industry. As the first complete food available to infant mammals, it is bioactive and it contains all the indispensable nutrients. Organic farming is deemed to produce high quality food under sustainable conditions and, at the same time, to protect the natural environment within the farm. However, the most recent food and nutrition research does not confirm the extensive health benefits related to the consumption of organic products. The objective of the research study was to evaluate and compare the quality of commercial organic and conventional cow’s milk as regards the contents of some selected mineral compounds. The research was conducted on the organic and conventional cow’s milk available on the market in Southern Poland. The milk samples were analysed for the concentration of selected minerals contained therein, including some selected toxic metals; the analyses were performed with the use of flame atomic absorption spectrometry, atomic emission spectrometry, and graphite furnace atomic absorption spectrometry. The results of the research show that, in terms of the contents of micro- and macroelements, the organic and conventional milk do not differ significantly. The differences were found only between the amounts of sodium and manganese. The organic milk contained, on average, a statistically significantly smaller amount of those elements. Moreover, the presence of lead was detected in one type of the organic milk, although its amount determined (5.24 mg/l) was within the acceptable limits. Cadmium (amounting to 0.12 and 0.15 μg/l) was found in the two types of milk derived from the same company and in one type of organic milk; however, its concentration in the latter milk type was at a relatively low level (0.04 μg/l).

Determination of Lanthanum, Europium, and Ytterbium in Food Samples by Electrothermal Atomic Absorption Spectrometry

1992 ◽  
Vol 75 (4) ◽  
pp. 667-671 ◽  
Author(s):  
Shen Miaokang ◽  
Shi Yinyu
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Inductively Coupled Plasma ◽  
Graphite Furnace ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Food Samples ◽  
Emission Spectrometry ◽  
Plasma Atomic Emission Spectrometry

Abstract A method had been developed for the determination of lanthanum, europium, and ytterbium in food samples by using electrothermal atomic absorption spectrometry with a graphite furnace lined with tungsten foil. The proposed method provides higher sensitivity than inductively coupled plasma/atomic emission spectrometry (ICP/AES); the characteristic masses are 8.1 x 10-9 g for lanthanum, 3.9 x 10-11 g for europium, and 4.27 x 10,-12 g for ytterbium. The precision, accuracy, and interferences of the method were also investigated. The method can be used for the analysis of trace amounts of lanthanum, europium, and ytterbium in various foods without predissociation of the matrixes of the digested solutions. The results obtained by the method are in good agreement with those from ICP/AES.

scholarly journals Determination of Mineral, Trace Element, and Pesticide Levels in Honey Samples Originating from Different Regions of Malaysia Compared to Manuka Honey

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Mohammed Moniruzzaman ◽  
Muhammed Alamgir Zaman Chowdhury ◽  
Mohammad Abdur Rahman ◽  
Siti Amrah Sulaiman ◽  
Siew Hua Gan
Keyword(s):  
Trace Elements ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Pesticide Residues ◽  
Graphite Furnace ◽  
Microwave Digestion ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Mineral Contents ◽  
Flame Atomic Absorption

The present study was undertaken to determine the content of six minerals, five trace elements, and ten pesticide residues in honeys originating from different regions of Malaysia. Calcium (Ca), magnesium (Mg), iron (Fe), and zinc (Zn) were analyzed by flame atomic absorption spectrometry (FAAS), while sodium (Na) and potassium (K) were analyzed by flame emission spectrometry (FAES). Trace elements such as arsenic (As), lead (Pb), cadmium (Cd), copper (Cu), and cobalt (Co) were analyzed by graphite furnace atomic absorption spectrometry (GFAAS) following the microwave digestion of honey. High mineral contents were observed in the investigated honeys with K, Na, Ca, and Fe being the most abundant elements (mean concentrations of 1349.34, 236.80, 183.67, and 162.31 mg/kg, resp.). The concentrations of the trace elements were within the recommended limits, indicating that the honeys were of good quality. Principal component analysis reveals good discrimination between the different honey samples. The pesticide analysis for the presence of organophosphorus and carbamates was performed by high performance liquid chromatography (HPLC). No pesticide residues were detected in any of the investigated honey samples, indicating that the honeys were pure. Our study reveals that Malaysian honeys are rich sources of minerals with trace elements present within permissible limits and that they are free from pesticide contamination.

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