Sequential injection analysis implementing multiple standard additions for As speciation by liquid chromatography and atomic fluorescence spectrometry (SIA-HPLC-AFS)

Jesus, José P.; Suárez, Carlos A.; Ferreira, José Roberto; Giné, María Fernanda

doi:10.1016/j.talanta.2011.06.013

Cited by 16 publications

(7 citation statements)

References 14 publications

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“…The As speciation was determined by HPLC‐AFS (Jitian, China) system following the method described in previous studies (Jesus et al . ; Hu et al . ).…”

Section: Methodsmentioning

confidence: 99%

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Bacillussp. SXB andPantoeasp. IMH, aerobic As(V)-reducing bacteria isolated from arsenic-contaminated soil

Zhuang

et al. 2012

J Appl Microbiol

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Aims: To isolate highly effective aerobic As(V)-reducing bacteria from arsenic (As)-contaminated soils in Northwest China and to identify their dynamic As (V) reduction processes and genomic detoxification mechanisms. Methods and Results: Enrichment cultures were performed aerobically in tryptone, yeast extract and glucose medium in the presence of As(V). Strain SXB isolated from soil in Shanxi Province, belonging to Bacillus genus, reduced As(V) more effectively under aerobic conditions than under anaerobic conditions. Strain IMH, a strictly aerobic isolate obtained from soil in Inner Mongolia, identified as Pantoea, is reported for the first time to reduce As(V). Both isolates could reduce over 90% As(V) in 36 h under aerobic conditions. Putative gene fragments for the ArsB efflux pump gene were obtained from both strains. The putative arsenate reductase gene was only amplified from strain SXB. A putative arsH gene was amplified from strain IMH. Conclusions: Strains SXB and IMH isolated from the As-contaminated soils reduce As(V) effectively under aerobic conditions via a detoxification mechanism regulated by ars operons. Significance and Impact of the Study: Pantoea genus is reported to reduce As (V) for the first time. This study provides a full understanding of the highly effective As(V)-reducing bacteria SXB and IMH, which could influence the As biogeochemical cycle in soils.

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“…The As speciation was determined by HPLC‐AFS (Jitian, China) system following the method described in previous studies (Jesus et al . ; Hu et al . ).…”

Section: Methodsmentioning

confidence: 99%

“…The density of the cultures, that is, OD 600 , was detected using a UV spectrophotometer (HACH DR2800, US). The As speciation was determined by HPLC-AFS (Jitian, China) system following the method described in previous studies (Jesus et al 2011;Hu et al 2012).…”

Section: Characterizations Of Different Isolates and Dynamic As(v)-rementioning

confidence: 99%

Bacillussp. SXB andPantoeasp. IMH, aerobic As(V)-reducing bacteria isolated from arsenic-contaminated soil

Zhuang

et al. 2012

J Appl Microbiol

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“…Extraction systems as well as the stability of the chemical species throughout the overall chemical process are also included. Jesus et al 169 propose a method for arsenic speciation by adding sequential injection analysis: SIA-HPLC-AFS. In such a system, while the chromatographic detection operates in the usual way, the SIA module is programmed to inject sequentially the standard additions of the arsenic species.…”

Section: Coupled Techniques That Use Hplc As the Separation Techniquementioning

confidence: 99%

Inorganic Arsenic Determination in Food: A Review of Analytical Proposals and Quality Assessment Over the Last Six Years

2016

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Here we review recent developments in analytical proposals for the assessment of inorganic arsenic (iAs) content in food products. Interest in the determination of iAs in products for human consumption such as food commodities, wine, and seaweed among others is fueled by the wide recognition of its toxic effects on humans, even at low concentrations. Currently, the need for robust and reliable analytical methods is recognized by various international safety and health agencies, and by organizations in charge of establishing acceptable tolerance levels of iAs in food. This review summarizes the state of the art of analytical methods while highlighting tools for the assessment of quality assessment of the results, such as the production and evaluation of certified reference materials (CRMs) and the availability of specific proficiency testing (PT) programmes. Because the number of studies dedicated to the subject of this review has increased considerably over recent years, the sources consulted and cited here are limited to those from 2010 to the end of 2015.

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“…3,5,[13][14][15] Results from samples with a complex matrix can be strongly affected if the differences between sample and standard matrices are neglected. Beside the external calibration, alternatives such as internal standard (IS) method [16][17][18][19] and standard addition method [20][21][22][23][24] are often used in analytical chemistry.…”

Section: Introductionmentioning

confidence: 99%

Combination of Multi-Energy Calibration (MEC) and Laser-Induced Breakdown Spectroscopy (LIBS) for Dietary Supplements Analysis and Determination of Ca, Mg and K

Augusto

Castro

Sperança

et al. 2018

J. Braz. Chem. Soc.

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This study describes the application of laser-induced breakdown spectroscopy (LIBS) for the direct determination of Ca, K and Mg in powdered dietary supplements. Multi-energy calibration (MEC) method was applied to obtain a calibration curve. With MEC, it was possible to observe spectral interferences and select adequate emission lines from LIBS. For Ca and Mg, five lines were selected and for K just two lines among four could be selected (compromising the results). The trueness for dietary supplements ranged from 81 to 103% for Ca and 74 to 106% for Mg. For K, just the samples S3 (95%) and S5 (109%) showed acceptable trueness values. In the case of Ca and K, besides the MEC, the normalization using C as internal standard also improved the figure of merit results. The MEC and normalization processes showed that possible matrix effect and spectral interferences could be avoided, and the results of trueness and precision were satisfactory.

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Sequential injection analysis implementing multiple standard additions for As speciation by liquid chromatography and atomic fluorescence spectrometry (SIA-HPLC-AFS)

Cited by 16 publications

References 14 publications

Bacillussp. SXB andPantoeasp. IMH, aerobic As(V)-reducing bacteria isolated from arsenic-contaminated soil

Bacillussp. SXB andPantoeasp. IMH, aerobic As(V)-reducing bacteria isolated from arsenic-contaminated soil

Inorganic Arsenic Determination in Food: A Review of Analytical Proposals and Quality Assessment Over the Last Six Years

Combination of Multi-Energy Calibration (MEC) and Laser-Induced Breakdown Spectroscopy (LIBS) for Dietary Supplements Analysis and Determination of Ca, Mg and K

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