Characterization of trace metals in vegetables by graphite furnace atomic absorption spectrometry after closed vessel microwave digestion

Bakkali, Karima; Martos, Natividad Ramos; Souhail, Badredine; Ballesteros, Evaristo

doi:10.1016/j.foodchem.2009.03.010

Cited by 73 publications

(38 citation statements)

References 25 publications

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“…Operating parameters of graphite furnace were satisfactory to run different kinds of biological samples. Chemical modifiers have been used routinely in the determination of a large number of analytes by ETAAS (1,3,10,12,17,20 The results of the test indicate that the values found in the certified material were on the similar level. The method was validated in terms of the linearity, LOD, LOQ, precision, recovery, and uncertainty (7,8).…”

Section: Discussionmentioning

confidence: 99%

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Determination of Chromium in Biological Material by Electrothermal Atomic Absorption Spectrometry Method

Nawrocka

Szkoda

2012

Bulletin of the Veterinary Institute in Pulawy

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Procedure for determination of chromium in biological materials by Zeeman graphite furnace atomic absorption spectrometry method using a Perkin-Elmer spectrometer equipped with hollow-cathode lamp at 357.9 nm was developed. The samples of animal tissues, food, and feed were digested in muffle furnace at 450ºC. The ash was dissolved in 1 N hydrochloric acid and the final solution was diluted in 0.2% nitric acid. Magnesium nitrate (1%) was used as a matrix modifier. The method was validated in terms of basic analytical parameters. The mean recoveries of chromium was 84.4% for muscle, 79.0% for canned meat, and 80.2% for feed, and analytical detection limit was 0.003 µg/g. Certified reference materials were used for analytical quality assurance. The proposed analytical procedure is well adapted for monitoring chromium content in food and feedstuffs. Content of total chromium in the tested samples (animal muscles and liver) was low and was situated in the range of 0.031-0.101 mg/kg (muscles) and 0.047-0.052 mg/kg (liver).

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Section: Discussionmentioning

confidence: 99%

“…The total concentration and different forms of chromium in foods from various countries varied widely depending on the food type, growing conditions, and processing techniques (1,4,5,11,(14)(15)(16)(17)27).…”

mentioning

confidence: 99%

Determination of Chromium in Biological Material by Electrothermal Atomic Absorption Spectrometry Method

Nawrocka

Szkoda

2012

Bulletin of the Veterinary Institute in Pulawy

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“…Debido a estos inconvenientes, se han propuesto otros procedimientos para la preparación de muestras vegetales, como digestión asistida por microondas y ultrasonido, sin embargo, el equipo de la digestión asistida por microondas es costoso y limita su aplicación (Bakkali et al, 2009;Soylak et al, 2007). Por otra parte, la energía empleada en la digestión asistida por ultrasonido, facilita y acelera algunos pasos, tales como la disolución, fusión y lixiviación, entre otros; por lo cual, ha sido utilizada para la preparación de muestras en aplicaciones agríco-las, biológicas y ambientales (Priego y Luque de Castro, 2007a).…”

Section: Introduccionunclassified

Desarrollo y validación de un método ambientalmente amigable para determinación de metales pesados en pastos

Chaparro

García

Cardona

et al. 2016

rcia

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Los metales pesados son peligrosos para los seres vivos y el medio ambiente, pues no pueden ser degradados y pueden llegar a los seres humanos a través la cadena trófica, por lo tanto, su determinación en diferentes matrices para consumo humano y animal, es de vital importancia. La metodología más utilizada para su extracción, es cenizas, la cual conlleva a tiempos largos de análisis y elevado consumo de energía, por esta razón, en el presente trabajo se desarrolló y validó un método ambientalmente amigable para la digestión y extracción de Cd+2 y Pb+2 en pastos, utilizando ultrasonido y espectroscopia de absorción atómica. Se evaluaron diferentes variables que afectan la digestión, como posición en el ultrasonido, peso de muestra, solvente, volumen del solvente, tiempo de sonicación y tipo de recipiente, en muestras de pastos dopadas con los metales, teniéndose como variable de respuesta, el porcentaje de recuperación. Las condiciones para extraer Cd+2 y Pb+2 en estas pasturas, fueron: 0,50g de tejido vegetal; 3,00mL de HCl:HNO3-3:1 expuestos 60min al ultrasonido, en tubos de vidrio cónicos. Este procedimiento mostró un comportamiento lineal en el rango de 0,50 - 8,00mg/Kg con R2 de 0,99 tanto para Cd como para Pb. Los límites de detección y cuantificación, fueron 0,25 y 0,43mg/Kg para Cd; 0,22 y 0,37mg/Kg para Pb. La metodología propuesta, se comparó con la técnica clásica y permitió determinar niveles trazas de estos metales tóxicos, en forraje proveniente del Magdalena medio, con porcentajes de recuperación de97,54 y 98,62%, respectivamente.

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“…5 The analytical methods for the determination of lead in food are well established and some are used as standard techniques, including ETAAS (electrothermal atomic absorption spectrometry), ICP-MS (inductively coupled plasma mass spectrometry) and ICP-OES (inductively coupled plasma optical emission spectrometry). [6][7][8][9] In the last few decades, many technical improvements have been made to ETAAS, such as the design of the atomizer, background correction systems and improvements in the light source and detector. These have allowed the determination of lead in food at the low microgram per kilogram level.…”

Section: Introductionmentioning

confidence: 99%

Direct Determination of Lead in Foods by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

et al. 2016

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A solid sampling method for the determination of lead in foods (including grains, vegetables and seafoods) using electrothermal vaporization atomic fluorescence spectrometry was established. The method introduced samples using electrothermal vaporization by quartz furnace and used on-line ashing and vaporization to remove matrix interferences for the specific trap of lead. It was proven by the certified reference material (CRM) and the recovery rate of the standards that the electrothermal vaporization was stable and there was no effect for sampling difference. The best operating program and parameters for the new method included ashing (850 C, 160 s), vaporization and trap (1050 C, 80 s; 800 C, 10 s), release (800 C, 10 s), and mixed Ar + H2 (85:15%, v/v) as carrier gas with flow rate of 500 mL/min. The relative standard deviations of repeated Pb measurements in CRMs were all below 5.0%, and the recovery rate ranged from 90.0 -110.0%. The limit of detection (LOD) for the new method was 3.0 pg and the limit of quantification (LOQ) was 10.0 pg. The total time of analysis was less than 6 min. No significant differences existed between the results measured by the new method and microwave ICP-MS.

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Characterization of trace metals in vegetables by graphite furnace atomic absorption spectrometry after closed vessel microwave digestion

Cited by 73 publications

References 25 publications

Determination of Chromium in Biological Material by Electrothermal Atomic Absorption Spectrometry Method

Determination of Chromium in Biological Material by Electrothermal Atomic Absorption Spectrometry Method

Desarrollo y validación de un método ambientalmente amigable para determinación de metales pesados en pastos

Direct Determination of Lead in Foods by Solid Sampling Electrothermal Vaporization Atomic Fluorescence Spectrometry

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