Highly sensitive pneumatic nebulization flame furnace atomic absorption spectrometry: complete sample aerosol introduction and on-line preconcentration of cadmium by atom trap

Wu, Peng; Liu, Rui; Lv, Yi; Hou, Xiandeng

doi:10.1039/b713137b

Cited by 29 publications

(20 citation statements)

References 31 publications

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“…Emerging data suggest that the alteration of metal homeostasis in the human body by cigarette smoking plays a crucial role in the genesis of a number of diseases. 3 Modern analytical chemistry is characterized by hyphenated analytical techniques that involve the combination of sensitive components to improve detection, as recently proposed by Wu et al 4 Sometimes, a preconcentration step helps to solve sensitivity problems, such as low analyte concentrations in actual samples or high concentration of matrix interferents present in complex samples, especially in biological ones. 5 Cloud point extraction (CPE) is a separation and preconcentration procedure that has been extensively applied in the determination of trace metal ions in several matrices.…”

Section: Introductionmentioning

confidence: 99%

Cadmium and lead cloud point preconcentration and determination in tobacco samples by thermospray flame furnace atomic absorption spectrometry

Andrade¹,

Nascentes²,

Costa³

2009

J. Braz. Chem. Soc.

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A espectrometria de absorção atômica com forno tubular na chama (TS-FF-AAS) foi empregada para a determinação de Cd e Pb em diferentes tipos de amostras brasileiras de tabacos após a pré-concentração no ponto nuvem (CP) otimizada por planejamento Doehlert. Para a separação das fases no procedimento por ponto nuvem, Triton ® X-114 e 2-(bromo-2-piridilazo)-5-dietilaminofenol (Br-PADAP) foram utilizados como surfactante não iônico e agente complexante, respectivamente. Cádmio e chumbo foram determinados após digestão ácida e pré-concentração por ponto nuvem, sendo que as variáveis otimizadas por planejamento Doehlert foram: volume do agente complexante, volume de Triton ® X-114 e pH. Um ponto de máximo foi obtido nas superfícies de resposta para Cd e Pb. Para as determinações dos elementos por TS-FF-AAS, um volume de amostra de 50 µL foi introduzido no tubo de Ni posicionado sobre a chama, usando ar como carregador na vazão de 0,4 mL min -1 . Os limites de detecção e os desvios padrão relativos após a combinação de CP e TS-FF-AAS foram de 4,0 e 13 µg kg -1 e 3,1 e 0,7% para Cd e Pb, respectivamente. A exatidão do método proposto foi avaliada realizando-se testes de adição-recuperação e empregando-se material de referência certificado (folhas de chá e folhas de pessegueiro). As recuperações variaram de 93 a 103 e 93 a 107% para Cd e Pb, respectivamente. Todos os resultados obtidos para as amostras dos materiais de referência estão em concordância com os valores certificados a um nível de confiança de 95 ou 99% aplicando-se o teste t-Student.A thermospray flame furnace atomic absorption spectrometer (TS-FF-AAS) was employed to determine Cd and Pb in different Brazilian tobacco samples. Sample pretreatment consisted of acid decomposition and cloud point (CP) preconcentration optimized by Doehlert design. To promote phase separation in the cloud point procedure, polyoxyethylene(8) isooctylphenyl ether (Triton ® X-114) and 2-(bromo-2-pyridylazo)-5-diethyl-amino-phenol (Br-PADAP) were used as a nonionic surfactant and a complexing agent, respectively. The variables of the cloud point preconcentration procedure optimized by Doehlert design were: complexing agent volume, Triton X-114 volume, and pH. A response surface maximum point was obtained for Cd and Pb. For TS-FF-AAS, a sample volume of 50 µL was introduced into the hot Ni tube using air carrier at a flow rate of 0.4 mL min -1 . The limits of detection and relative standard deviations obtained for Cd and Pb when CP and TS-FF-AAS were associated were 4.0 and 13 µg kg -1 , and 3.1 and 0.7%, respectively. Accuracy was checked by addition-recovery experiments, as well as by using two certified reference materials (tea and peach leaves). Cadmium and lead recoveries ranged from 93 to 103 and 93 to 107%, respectively. All results obtained for reference materials were in agreement with certified values at 95 or 99% confidence levels by t-Student test.

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Section: Introductionmentioning

confidence: 99%

Cadmium and lead cloud point preconcentration and determination in tobacco samples by thermospray flame furnace atomic absorption spectrometry

Andrade¹,

Nascentes²,

Costa³

2009

J. Braz. Chem. Soc.

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“…A sound strategy for online atom trapping was developed by Wu et al [86] for preconcentration purposes. The analyte solution was introduced via a pneumatic nebulizer into the flame-heated furnace by a flow of Ar and the middle part of the flame furnace where the carrier gas impacts was cooled by the sample aerosol.…”

Section: Flame Furnace and Hydride Generationmentioning

confidence: 99%

Old and New Flavors of Flame (Furnace) Atomic Absorption Spectrometry

Dionísio

Jesus

Amais

et al. 2011

International Journal of Spectroscopy

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This paper presents some recent applications of Flame Atomic Absorption Spectrometry (FAAS) to different matrices and samples. The time window selected was from 2006 up to March, 2011, and several aspects related to food, biological fluids, environmental, and technological samples analyses were reported and discussed. In addition, the chemometrics application for FAAS methods development was also taken into account, as well as the use of metal tube atomizers in air/acetylene flame. Preconcentration methods coupled to FAAS were discussed, and several approaches related to speciation, flotation, ionic liquids, among others were discussed. This paper can be interesting for researchers and FAAS users in order to see the state of the art of this technique.

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“…En los últimos años se han reportado mejoras significativas en los límites de detección de la espectrofotometría de la absorción atómica (AAS) mediante atomización con tubo en la llama en sus variantes denominadas thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) 1-4 y beam-injection flame furnace atomic absorption spectrometry (BIFF-AAS). [5][6][7] Dentro de estas mejoras, Wu et al 4 ha propuesto una nueva forma de introducción de muestra en TS-FF-AAS y Lobo et al, 8 ha presentado importantes resultados del uso de la mezcla de gases de óxido nitroso-acetileno para la determinación de estaño. Por otro lado, variadas aplicaciones de la TS-FF-AAS han sido investigadas, tales como: las determinaciones de los metales trazas Cd, Pb y Zn tanto en muestras biológicas 9,10 y alimentos, [11][12][13] como también en algunas matrices marinas 14,15 y Cd y Pb en muestras de tabaco brasilero.…”

Section: Introduccionunclassified

Preconcentración y atomización con tubo en la llama para la determinación de Cadmio en agua de mar

Sepúlveda¹,

Fuentes²,

Hinojosa³

2011

Quím. Nova

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IN SEAWATER. A flow injection on-line pre-concentration system coupled to thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) for cadmium determination at sub µg L-1 levels in seawater samples was developed. The on-line system was evaluated by analysing cadmium containing in a synthetic seawater matrix (2.5% m/v NaCl, 0.5% m/v MgCl 2 and 0.8% m/v CaCl 2). A sample volume of 2 mL allows determining Cd with a detection limits of 30 ng L-1 (3* σ blank /slope), pre-concentration factor of 34 and repeatability of 1,8% (calculated as RSD, N=8 and containing 200 ng L-1 of Cd).

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Highly sensitive pneumatic nebulization flame furnace atomic absorption spectrometry: complete sample aerosol introduction and on-line preconcentration of cadmium by atom trap

Cited by 29 publications

References 31 publications

Cadmium and lead cloud point preconcentration and determination in tobacco samples by thermospray flame furnace atomic absorption spectrometry

Cadmium and lead cloud point preconcentration and determination in tobacco samples by thermospray flame furnace atomic absorption spectrometry

Old and New Flavors of Flame (Furnace) Atomic Absorption Spectrometry

Preconcentración y atomización con tubo en la llama para la determinación de Cadmio en agua de mar

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