Pervaporation as a Separation Technique for Direct Determination of Volatile Selenium Species by Atomic Fluorescence Spectrometry

Moreno, Ma. Eva; Muñoz, Riansares; Pérez-Conde, C.; Cámara, Carmen

doi:10.1080/03067310008041357

Cited by 6 publications

(8 citation statements)

References 21 publications

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“…Methods reported for solid samples involving GC coupled with dynamic or static headspace [27] present many drawbacks. In this sense, pervaporation coupled to GC can be an alternative to headspace techniques, as previously reported for selenium and organic mercury [28,29].…”

Section: Introductionmentioning

confidence: 92%

“…This coupling has been described in more detail in a previous paper [28]. The system includes a pervaporation chamber made of methacrylate and designed in our laboratory in order to separate the analytes from solid matrices.…”

Section: Pv-afsmentioning

confidence: 99%

“…This method has been developed and optimised previously [28] and no further optimisation was required. It can be applied to detect presence of DMSe and DMDSe in the samples.…”

Section: Determination and Quantification Of Dmse And Dmdse In Real Smentioning

confidence: 99%

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The effect of the presence of volatile organoselenium compounds on the determination of inorganic selenium by hydride generation

2003

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As a result of microbiological activity it is possible to find dimethylselenium (DMSe) and dimethyldiselenium (DMDSe) in a wide type of environmental samples, such as soils, sediments, sewage sludges and plants where methylation can take place. Selenium determination by hydride-generation (HG) techniques requires its presence as Se(IV). Consequently, inorganic speciation by hydride generation techniques is done by first determining Se(IV) and then, after reduction of Se (VI) to Se(IV), the total selenium. Therefore, the concentration of Se (VI) is evaluated as the difference between total inorganic selenium and Se(IV). In the present work it could be demonstrated that DMSe and DMDSe are forming other volatile species by reaction with sodium borohydride, applying the same reduction condition as for inorganic selenium. These species are subsequently detected by several atomic techniques (atomic absorption AAS, atomic fluorescence AFS and inductively coupled plasma-mass spectrometry ICP-MS). The error that their presence can cause in determination of inorganic selenium has been evaluated. The magnitude of this error depends on the specific analytical detector used.The coupling of pervaporation-atomic fluorescence is proposed for the identification of these species and pervaporation-gas chromatography-atomic fluorescence for their individual quantification.

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Section: Introductionmentioning

confidence: 92%

Section: Pv-afsmentioning

confidence: 99%

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The effect of the presence of volatile organoselenium compounds on the determination of inorganic selenium by hydride generation

2003

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“…To date, the pervaporation phenomenon has rarely been applied in analytical chemistry. Some of the more recent applications have focused on different analytes: fluoride [20], acetaldehyde [21], trimethylamine [22], selenium [23], etc. Two previous papers for mercury speciation using the pervaporation approach were published by Bryce et al [24,25].…”

Section: Introductionmentioning

confidence: 99%

Coupling pervaporation to AAS for inorganic and organic mercury determination. A new approach to speciation of Hg in environmental samples

Fernandez-Rivas

Muñoz-Olivas

Cámara

2001

Fresenius J Anal Chem

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The design and development of a new approach for Hg speciation in environmental samples is described in detail. This method, consisting of the coupling of pervaporation and atomic absorption spectrometry, is based on a membrane phenomenon that combines the evaporation of volatile analytes and their diffusion through a polymeric membrane. It is proposed here as an alternative to gas chromatography for speciation of inorganic and organic Hg compounds, as the latter compounds are volatile and can be separated by applying the principles mentioned above. The interest of this method lies in its easy handling, low cost, and rapidity for the analysis of liquid and solid samples. This method has been applied to Hg speciation in a compost sample provided by a waste water treatment plant.

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“…There is one reference to PV coupled to AFS, for the determination of volatile methylated Se species (DMSE and DMDSe) for slurry sampling, 108 although it presents the main drawback of pervaporation efficiencies ranging from 55-85%.…”

mentioning

confidence: 99%

Atomic Fluorescence Spectrometry: a suitable detection technique in speciation studies for arsenic, selenium, antimony and mercury

Sánchez-Rodas

Corns

Chen

et al. 2010

J. Anal. At. Spectrom.

251

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Atomic Fluorescence Spectrometry (AFS) is an ideal detection technique for speciation studies concerning hydride forming elements (mainly As, Se and Sb) and Hg. The analytical features of AFS, such as detection limits below the mg L À1 and the wide linear calibration range, up to the mg L À1, allow its application to a great variety of environmental, biological and food samples. AFS represents a suitable alternative to other atomic spectrometers commonly employed in speciation studies such as Atomic Absorption Spectrometry (AAS) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The instrumentation used for AFS and the design of the vapour generation and optical layouts required to sustain the full benefits of the AFS approach are also described. The present review explains and comments on the instrumental couplings of chromatographic (HPLC and GC) and nonchromatographic separations (CE) with AFS detection, with online hydride generation for the speciation of inorganic and organic compounds of As, Se and Sb, and cold vapour for Hg. Other optional intermediate steps are online photo-oxidation (UV), pyrolysis or Microwave Assisted Digestion (MAD) for non-directly reducible compounds. Many different sample types (e.g. water, soils, air, biota, food) have been analysed using these instrumental couplings with AFS detection. These are summarised and discussed.

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Pervaporation as a Separation Technique for Direct Determination of Volatile Selenium Species by Atomic Fluorescence Spectrometry

Cited by 6 publications

References 21 publications

The effect of the presence of volatile organoselenium compounds on the determination of inorganic selenium by hydride generation

The effect of the presence of volatile organoselenium compounds on the determination of inorganic selenium by hydride generation

Coupling pervaporation to AAS for inorganic and organic mercury determination. A new approach to speciation of Hg in environmental samples

Atomic Fluorescence Spectrometry: a suitable detection technique in speciation studies for arsenic, selenium, antimony and mercury

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