Investigation of four digestion procedures for multi-element determination of toxic and nutrient elements in legumes by inductively coupled plasma-optical emission spectrometry

Momen, Awad Abdalla; Zachariadis, George A.; Anthemidis, Aristidis N.; Stratis, J. A.

doi:10.1016/j.aca.2006.01.104

Cited by 52 publications

(32 citation statements)

References 21 publications

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“…It can be designed as user-friendly, field-portable units (systems have been designed for deployment on the Mars Rover). In contrast, competing techniques, such as inductively coupled plasma optical emission spectrometry (ICP-OES) [11,12], inductively coupled plasma mass spectrometry (ICP-MS) [13] and flame atomic absorption spectrometry (FAAS) [14] require that samples be dissolved, which is expensive in time and/or reagants.…”

Section: Figure 1 Laser-induced Breakdown Spectroscopy (Libs) Measurmentioning

confidence: 99%

Feedstock Quality Factor Calibration and Data Model Development

Boardman¹,

Westover²,

Gresham³

2010

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Objective:The goal of the feedstock assembly operation is to deliver uniform, quality-assured feedstock materials that will enhance downstream system performance by avoiding problems in the conversion equipment. In order to achieve this goal, there is a need for rapid screening tools and methodologies for assessing the thermochemical quality characteristics of biomass feedstock through the assembly process. Laser-induced breakdown spectroscopy (LIBS) has been identified as potential technique that could allow rapid elemental analyses of the inorganic content of biomass feedstocks; and consequently, would complement the carbohydrate data provided by near-infrared spectrometry (NIRS). These constituents, including Si, K, Ca, Na, S, P, Cl, Mg, Fe and Al, create a number of downstream problems in thermochemical processes. In particular, they reduce the energy content of the feedstock, influence reaction pathways, contribute to fouling and corrosion within systems, poison catalysts, and impact waste streams. Expected Outcome:The mineral content and composition is recognized as both a barrier to the use of some feedstocks and as a quality attribute that may be controlled through the feedstock assembly process. The inorganic content of biomass feedstocks is known to vary over wide ranges, depending upon the plant type and anatomical fraction, growing conditions, harvesting time and method, and handling operations. If this task is successful in developing a cost-effective screening tool, there may be opportunities for selecting and blending diverse feedstocks to produce on-spec materials that will in turn, reduce the capital and maintenance costs associated with syngas cleaning and replacing components in conversion platforms. Progress:Scoping studies have been conducted with the instrumentation in order to establish the feasibility of using the LIBS technique as a feedstock screening tool and to determine the optimal system operational parameters. These parameters include identifying the most sensitive, interference-free analytical lines for key elements and the laser ablation pulse parameters for sampling the materials. The sensitivity of the analytical lines to changes in elemental concentrations over ranges of interest has been benchmarked against independent analytical analyses conducted by Hazen Research Inc.

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Section: Figure 1 Laser-induced Breakdown Spectroscopy (Libs) Measurmentioning

confidence: 99%

Feedstock Quality Factor Calibration and Data Model Development

Boardman¹,

Westover²,

Gresham³

2010

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“…The dry ashing procedure is a modification of Laing et al (2003) and Momen et al (2006). Briefly, two gram sample of CAF as well as field blacks was weighed into a porcelain crucible and heated on an electric hot plate at low temperature until carbonized (no smoke).…”

Section: Caf Treatment For Heavy Metals Analysismentioning

confidence: 99%

Evaluation of Car Air Filters’ Efficiency as Active Samplers for Polycyclic Aromatic Hydrocarbons and Heavy Metals

Cai

Xiao

Lü

et al. 2014

Aerosol Air Qual. Res.

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In this study, an innovative and inexpensive approach, based on car engine air filters (CAFs), was used to monitor polycyclic aromatic hydrocarbons (PAHs) and heavy metals (HMs). CAFs were collected from two taxi garages in Guangzhou and analyzed for PAHs and heavy metals. The total concentrations of eight high molecular weight PAHs (ΣPAHs) ranged from 923 to 11378 µg/CAF. The average Σ PAHs concentration in winter was slightly higher than in summer, a seasonal signal that is observed in most studies. The most abundant individual PAH was chrysene, followed by benzo

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“…[15][16][17] However, most of these procedures are tedious, require complex laboratory equipment, and increase the risk of contamination and analyte loss by volatilization or adsorption in glass flasks. In this context, simple alternatives to avoid these potential problems include the direct analysis of solid samples or the use of slurry sampling, which significantly reduces the time required for sample preparation and the use of corrosive and hazardous reagents.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

Silva¹,

Nunes²,

Oreste³

et al. 2012

J. Braz. Chem. Soc.

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Foram avaliados dois métodos diferentes de preparo de amostras de carnes baseados na solubilização em meios alcalino ou ácido. O objetivo deste estudo foi determinar os teores de Na e K após solubilização com hidróxido de tetrametilamônio (TMAH) à temperatura ambiente, e com ácido fórmico e aquecimento em bloco de digestão a 50 ºC por cerca de 2 h. A solubilização alcalina se apresentou como uma metodologia simples e robusta e a melhor alternativa frente aos procedimentos de mineralização convencional, permitindo a solubilização completa das amostras usando pequenas quantidades de TMAH. O método foi validado empregando-se materiais de referência certificada assim como pela comparação com método de digestão convencional com ácido nítrico. Os limites de detecção obtidos foram de 0,8 e 2,0 mg g -1 para Na e K, respectivamente, e se mostraram adequados para o objetivo das análises.Two different sample preparation methods were evaluated for meat samples employing the solubilization in alkaline or acidic media. The aim of this study was to determine Na and K levels after sample solubilization with tetramethylammonium hydroxide (TMAH) at room temperature, and with formic acid and heating in a digester block at 50 ºC for ca. 2 h. The alkaline solubilization showed to be a simple and robust method and the better alternative in relation to the mineralization conventional procedures, allowing the complete solubilization of the samples even when small quantities of TMAH were used. The method was validated by using certified reference material as well as by comparing with samples digested with nitric acid. The limits of detection obtained were 0.8 and 2.0 μg g -1 for Na and K, respectively, and showed to be adequate for the analysis purposes.

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Investigation of four digestion procedures for multi-element determination of toxic and nutrient elements in legumes by inductively coupled plasma-optical emission spectrometry

Cited by 52 publications

References 21 publications

Feedstock Quality Factor Calibration and Data Model Development

Feedstock Quality Factor Calibration and Data Model Development

Evaluation of Car Air Filters’ Efficiency as Active Samplers for Polycyclic Aromatic Hydrocarbons and Heavy Metals

Evaluation of sample preparation methods based on alkaline and acid solubilization for the determination of Na and K in meat samples by atomic spectrometric techniques

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