Análise direta de sólidos por espectrometria de absorção atômica com atomização em forno de grafite: uma revisão

Nomura, Cassiana Seimi; Silva, Cíntia Soares da; Oliveira, Pedro Vitoriano de

doi:10.1590/s0100-40422008000100022

Cited by 38 publications

(36 citation statements)

References 34 publications

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“…The direct analysis of solid to LOD calculation is not trivial and not standardized because the blank (sample without the analyte) is difficult obtain [19] [20]. In addition, in our experiment, there was no soil sample that did not contain C, as detected by LIBS.…”

Section: Libs Setup Spectral Correction and Soil Analysesmentioning

confidence: 83%

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Segnini¹,

Xavier²,

Otaviani-Junior³

et al. 2014

AJAC

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Advanced field methods of carbon (C) analysis should now be capable of providing repetitive, sequential measurements for the evaluation of spatial and temporal variation at a scale that was previously unfeasible. Some spectroscopy techniques, such as laser-induced breakdown spectroscopy (LIBS), have portable features that may potentially lead to clean and rapid alternative approaches for this purpose. The goal of this study was to quantify the C content of soils with different textures and with high iron and aluminum concentrations using LIBS. LIBS emission spectra from soil pellets were captured, and the C content was estimated (emission line of C (I) at 193.03 nm) after spectral offset and aluminum spectral interference correction. This technique is highly portable and could be ideal for providing the soil C content in a heterogeneous experiment. Dry combustion was used as a reference method, and for calibration a conventional linear model was evaluated based on soil textural classes. The correlation between reference and LIBS values showed r = 0.86 for medium-textured soils and r = 0.93 for fine-textured soils. The data showed that better correlation and lower error (14%) values were found for the fine-textured LIBS model. The limit of detection (LOD) was found to be 0.32% for medium-textured soils and 0.13% for finetextured soils. The results indicated that LIBS quantification can be affected by the texture and chemical composition of soil. Signal treatment was shown to be very important for mitigation of these interferences and to improve quantification.

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Section: Libs Setup Spectral Correction and Soil Analysesmentioning

confidence: 83%

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Segnini¹,

Xavier²,

Otaviani-Junior³

et al. 2014

AJAC

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“…33,34,36,[40][41][42] Sometimes, solid reference materials can be required or even it could be necessary to add the standard solution onto the residual matrix remaining from the previous sample run. 47 One of the main requirements for the development of a calibration method using aqueous standard solutions is that when analyzing solid samples the matrix effect on the absorbance signal is negligible.…”

Section: Analysis Of Carbon Nanotube Samplesmentioning

confidence: 99%

“…In addition, the very low limits of detection and relative robustness make this technique suitable for trace element analysis for routine aplication. 27,32,[39][40][41][42] In the present study DSS-ET AAS was applied to the determination of eight elements (Al, Cd, Co, Cr, Cu, Mg, Mn and Pb) in SWCNTs and MWCNTs. The operational parameters were evaluated in order to achieve feasible calibration using aqueous standards.…”

mentioning

confidence: 99%

Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry

Mello¹,

Rodrigues²,

Nunes³

et al. 2011

J. Braz. Chem. Soc.

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soluções aquosas e massa máxima de amostra. Para comparação dos resultados as amostras foram analisadas por espectrometria de massa com plasma indutivamente acoplado (ICP-MS) e espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES) após decomposição por via úmida em sistema de alta pressão assistida por micro-ondas e também por combustão iniciada por micro-ondas. Não foram observadas diferenças significativas entre os resultados obtidos pelo método proposto e pelas outras técnicas. A exatidão também foi avaliada por comparação com resultados de análise por ativação neutrônica (NAA). A calibração foi possível com soluções de referência aquosas. Os sinais de fundo foram sempre inferiores a 0,02 (altura de pico) e o uso de modificador químico não foi necessário. O método proposto possibilitou a determinação de todos os analitos, com menores limites de detecção quando comparados com as outras técnicas.Metal impurities (Al, Cd, Co, Cr, Cu, Mg, Mn and Pb) were determined in carbon nanotubes (CNTs) by direct solid sampling electrothermal atomic absorption spectrometry (DSS-ET AAS, deuterium lamp background corrector). Parameters as pyrolysis and atomization temperatures, use of Pd as chemical modifier, feasibility of calibration using aqueous standard solutions and maximum sample mass were investigated. Results obtained by the proposed method were compared with those obtained by neutron activation analysis (NAA) and also by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP OES) after high-pressure microwave assisted wet digestion and microwave-induced combustion methods. No significant differences were observed between the results obtained by DSS-ET AAS, ICP-MS and ICP OES after both digestion methods and also by NAA. Calibration was performed using aqueous standards. Background signals were always lower than 0.02 (peak height) and no chemical modifier was used. The proposed method allowed the determination of all elements in CNTs with lower limits of detection in comparison with other techniques.Keywords: carbon nanotubes, metal impurities, solid sampling, electrothermal atomic absorption spectrometry IntroductionSince the advent of nanotechnology the development of new materials with a wide range of special properties has been performed for very different applications in almost all technological fields. With the discovery of carbon nanotubes (CNTs) by Iijima, 1 this new class of nanomaterials provided unique chemical, mechanical and electronic properties. In recent years, carbon nanotubes have received a growing interest in several fields as materials industry, electronics, medicine and also in analytical applications. [2][3][4][5][6][7] Carbon nanotubes can be described as a kind of graphite structure which is based on benzene-type hexagonal rings of carbon atoms, rolled up in a nanoscale tube (diameter ranging from a few tenths to tens of nanometers). This nanomaterial can be defined as a single-wall carbon nanotube (SWCNT) ...

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“…2,3 These methods are interesting because there is little sample manipulation, which shows many advantages over the conventional methods, such as increased frequency rate, reduced contamination risks, and decrease of possible losses of analyte by volatilization. [4][5][6] Studies have also described alternative methods such as slurry sampling, which involves the partial or complete solubilization of the sample matrix using both acid and alkaline reagents. [7][8][9] However, few types of equipment allow direct solid sample analysis and/or suspensions, which may lead to a significant increase of the risk caused by sample matrix interference.…”

Section: Introductionmentioning

confidence: 99%

New Design of Mini PTFE Vessels for Sample Preparation in Micro Scale: Determination of Cd, K, Mg and Na in Biological Sample

Oliz

Souza

Pereira

et al. 2017

J. Braz. Chem. Soc.

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This paper presents a study involving the development of a new mini polytetrafluoroethylene (PTFE) vessel project for biological sample preparation in micro scale in closed system with microwave radiation for subsequent determination of Cd, K, Mg and Na by atomic spectrometry techniques. All experiments were carried out in micro quantities of samples (up to 20 mg) and reagents (300 µL of HNO 3 ) for 5 min at 350 W. Certified reference materials of biological samples (bovine muscle and liver) were used to evaluate the accuracy of the proposed system and the results obtained were in agreement with the certified value at 95% of confidence (t-test). Relative standard deviations (RSD) were lower than 8.0% for all elements. The proposed method is not only easy and fast, but it is also based on the use of an inexpensive system for sample digestion.

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Análise direta de sólidos por espectrometria de absorção atômica com atomização em forno de grafite: uma revisão

Cited by 38 publications

References 34 publications

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry

New Design of Mini PTFE Vessels for Sample Preparation in Micro Scale: Determination of Cd, K, Mg and Na in Biological Sample

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