Minimization of sample pretreatment for Al, Cu and Fe determination in coconut water by electrothermal atomic absorption spectrometry

Naozuka, Juliana; Oliveira, Pedro Vitoriano de

doi:10.1590/s0103-50532006000300014

Cited by 18 publications

(13 citation statements)

References 16 publications

(30 reference statements)

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“…35,36 On-the-coil sample decomposition followed by WCAES has also been successfully applied to sh, beverage and biodiesel samples. Graphite tubes and tungsten laments have been used to decompose sample matrix and improve precision and accuracy in determinations by ICP-MS, 32,33 ICP OES 34 and graphite furnace atomic absorption spectrometry (GFAAS).…”

Section: Resultsmentioning

confidence: 99%

Direct determination of chromium in empty medicine capsules by tungsten coil atomic emission spectrometry

Gonçalves

Santos

et al. 2015

J. Anal. At. Spectrom.

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Tungsten coil atomic emission spectrometry (WCAES) is used to determine trace levels of Cr in medicine capsules. No sample preparation other than 10 min vortex mixing with HNO 3 and H 2 O 2 is required.Matrix decomposition is carried out directly on the atomizer to minimize matrix effects and improve precision and accuracy. The entire analysis takes less than 12 min per sample including sample preparation. The instrumental setup is based on a tungsten filament extracted from 150 W, 15 V microscope light bulbs, solid state power supply, fused silica lens, crossed Czerny-Turner spectrograph and a thermoelectrically-cooled charge-coupled device detector. The limits of detection (LOD) and quantification (LOQ) for Cr are 3 and 9 mg L À1 , which correspond to procedure LOD and LOQ of 0.4 and 1 mg g À1 , respectively. These values allow for quantification at a level 28-fold lower than the maximum daily Cr intake from medicine and medicine formulations recommended by the United States Pharmacopeial Convention (USP). The procedure's linear dynamic range is between 3-100 mg L À1 , with a R 2 ¼ 0.9992. It was applied to different empty medicine capsule samples and WCAES results were not significantly different from values found by inductively coupled plasma optical emission spectrometry (ICP OES) by applying a single-factor ANOVA test at the 95% confidence level (p > 0.05). The precision, calculated as %RSD, is between 5.2-7.4%. This is a simple, fast, efficient and potentially portable analytical procedure that may be used in quality control and regulation enforcement applications. ; Fax: +1 336 758 4656; Tel: +1 336 758 4815 † Electronic supplementary information (ESI) available. See

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Section: Resultsmentioning

confidence: 99%

Direct determination of chromium in empty medicine capsules by tungsten coil atomic emission spectrometry

Gonçalves

Santos

et al. 2015

J. Anal. At. Spectrom.

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“…In the case of Cu determination, a volume of 10 μL of matrix modifier (1% v/v HNO 3 +15% v/v H 2 O 2 ) was coinjected into the graphite atomizer with 15 μL of the analytical solutions or sample. The detailed procedure was described in the literature (Naozuka and Oliveira 2006).…”

Section: Methodsmentioning

confidence: 99%

“…The complex chemical composition of green coconut water includes carbohydrates (fructose and glucose); proteins; lipids; vitamins (Jackson et al 2004;Jayalekshmy et al 1986;Jayalekshmy et al 1988); minerals, such as Al, Cu, Ca, Cu, Fe, K, Mg, Mn, Na, Se, and Zn (Aleixo et al 2000;Chumbimuni-Torres and Kubota 2006;de Sousa et al 2005ade Sousa et al , b, 2006Naozuka and Oliveira 2006;Oliveira et al 2005;Richter et al 2005;Santoso et al 1996); and chloride, phosphate, sulfate, malate, and ascorbate (Richter et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Use of Metals and Anion Species with Chemometrics Tools for Classification of Unprocessed and Processed Coconut Waters

et al. 2010

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Coconut water is a natural isotonic, nutritive, and low-caloric drink. Preservation process is necessary to increase its shelf life outside the fruit and to improve commercialization. However, the influence of the conservation processes, antioxidant addition, maturation time, and soil where coconut is cultivated on the chemical composition of coconut water has had few arguments and studies. For these reasons, an evaluation of coconut waters (unprocessed and processed) was carried out using Ca, Cu, Fe, K, Mg, Mn, Na, Zn, chloride, sulfate, phosphate, malate, and ascorbate concentrations and chemometric tools. The quantitative determinations were performed by electrothermal atomic absorption spectrometry, inductively coupled plasma optical emission spectrometry, and capillary electrophoresis. The results showed that Ca, K, and Zn concentrations did not present significant alterations between the samples. The ranges of Cu, Fe, Mg, Mn, PO 4 3− , and SO 4 2− concentrations were as follows: Cu (3.1-120 µg L −1 ), Fe (60-330 µg L −1 ), Mg (48-123 mg L −1 ), Mn (0.4-4.0 mg L −1 ), PO 4 3− (55-212 mg L −1 ), and SO 4 2− (19-136 mg L −1 ). The principal component analysis (PCA) and hierarchical cluster analysis (HCA) were applied to differentiate unprocessed and processed samples. Multivariated analysis (PCA and HCA) were compared through one-way analysis of variance with Tukey-Kramer multiple comparisons test, and p values less than 0.05 were considered to be significant.

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“…A GF AAS reúne condições favoráveis para a determinação de elementos em níveis de traço, tais como baixo limite de detecção (na ordem de µg L -1 ), boa seletividade e sensibilidade (NAOZUKA & OLIVEIRA, 2006). Essas características são devido ao tipo de atomizador utilizado, um forno de grafite, que permite com que toda a amostra depositada no interior do tubo de grafite seja processada e os elementos de interesse atomizados em um curto espaço de tempo, em uma atmosfera inerte.…”

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Estudo de métodos para a determinação de As, Cd, Pb, Cr e Se em fertilizantes base orgânica por AAS e ICP OES

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Minimization of sample pretreatment for Al, Cu and Fe determination in coconut water by electrothermal atomic absorption spectrometry

Cited by 18 publications

References 16 publications

Direct determination of chromium in empty medicine capsules by tungsten coil atomic emission spectrometry

Direct determination of chromium in empty medicine capsules by tungsten coil atomic emission spectrometry

Use of Metals and Anion Species with Chemometrics Tools for Classification of Unprocessed and Processed Coconut Waters

Estudo de métodos para a determinação de As, Cd, Pb, Cr e Se em fertilizantes base orgânica por AAS e ICP OES

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