Selenium speciation by capillary electrophoresis

Morales, Roberto; López-Sánchez, José Fermı́n; Rubio, R.

doi:10.1016/j.trac.2007.12.003

Cited by 20 publications

(10 citation statements)

References 34 publications

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“…Speciation analysis of Se species, such as inorganic selenite (Se(IV)), inorganic selenate (Se(VI)), selenomethylselenocysteine (SeMSeCys), selenocystine (SeCys) and seleno-methionine (SeMet), using various instrumental techniques have been published in recent years [29][30][31][32][33].…”

Section: Speciation Of Sementioning

confidence: 99%

Recent advances in speciation analysis of mercury, arsenic and selenium

2012

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Mercury (Hg), arsenic (As) and selenium (Se) are ubiquitous in the environment and exist in a variety of species, which have great influence on their transport, bioaccumulation and toxicity. This review presents the recent research progress in speciation analysis of Hg, As, and Se, with emphasis on enhanced cold vapor generation as interface for liquid chromatography and atomic spectrometry, speciation of volatile species in gas phase, and isotope dilution technique to improve the precision and accuracy of speciation. Hyphenated techniques to characterize the complexes of Hg and As with phytochelatins and chromatographic separation coupled with multi-collector-inductively coupled plasma mass spectrometry to measure species-specific isotopic ratios, are also briefly discussed. Mercury (Hg) and arsenic (As) are among the most highly toxic elements for humans and ecosystems and can cause serious environmental and human health problems even at low concentrations [1,2]. Selenium (Se) is an "essential toxin" for human health. It has been recognized as an important antioxidant and anti-cancer element. However, Se can also pose negative impact such as defective skin and hair loss [3]. The adsorption/uptake, transport, bioaccumulation, metabolism and toxicity of these elements strongly depend on their chemical species present in environmental and biological samples. In the environment, one species can transform to another through chemical or biological processes. For example, in anaerobic sediments, sulfur-reducing or iron-reducing bacteria can methylate inorganic mercury into highly toxic methylmercury (MeHg) [4,5]. Therefore, speciation analysis of Hg, As and Se is of great importance in order to elucidate the biogeochemcal cycle and toxicology of these elements. Speciation analysis mainly involves chromatographic separation (gas chromatography (GC) or high performance liquid chromatography (HPLC)) hyphenated with element-specific spectrometry or molecular mass spectrometry. This review presents the recent advances in speciation analysis of Hg, As, and Se based on chromatographic separation, with emphasis on enhanced cold vapor generation (CVG) as interface for LC and atomic spectrometry, speciation of volatile Hg, As and Se in gas phase, and isotope dilution technique to improve the precision and accuracy of speciation. Hyphenated techniques to characterize the complexes of Hg and As with phytochelatins and chromatographic separation coupled with multi-collector-inductively coupled plasma mass spectrometry (MC-ICP-MS) to measure species-specific isotopic ratios, are also briefly introduced.

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Section: Speciation Of Sementioning

confidence: 99%

Recent advances in speciation analysis of mercury, arsenic and selenium

2012

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“…However, the hyphenation of LC techniques with ICP-MS is a necessary tool, capable of detecting the low Se concentrations often encountered in the environmental compartments (B'Hymer & Caruso, 2004Rosen & Hieftje, 2004). Recently, selenium speciation by capillary electrophoresis was also reviewed (Morales et al, 2008), denoting the limited application of CE in environmental analysis of Se species and the absence of methods for samples from BWTS. Nonchromatographic hydride generation atomic spectrometric techniques for the speciation analysis of selenium have also been reviewed (Kumar & Riyazuddin, 2007).…”

Section: Speciation Of Selenium Compoundsmentioning

confidence: 99%

Fate and Biotransformation of Metal and Metalloid Species in Biological Wastewater Treatment Processes

Stasinakis

Thomaidis

2010

Critical Reviews in Environmental Science and Technology

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Suspended and attached growth wastewater treatment processes are widely used for the removal of biodegradable organic constituents and nutrients from wastewater. The frequent detection of toxic metals and metalloids in wastewater contributed to the publishing of numerous papers in the past, investigating their presence, toxicity and behavior in biological wastewater treatment systems (BWTS). In most of these studies, data were referred to total element concentration. However, nowadays it is generally accepted that toxicological and physicochemical properties are differentiated according to elemental speciation. The literature review revealed that there are enough studies investigating chromium species presence, toxicity, fate and biotransformation in BWTS, whereas there are fewer data for organotin compounds. Even less studies exist for arsenic, mercury and selenium species. Most of the results are referred to the activated sludge process. The biotransformation mechanisms are element-dependent. The reduction of Cr(VI) to Cr(III), the sequential debutylation of tributyltin and triphenyltin to inorganic tin, the oxidation of As(III) to As(V) and their methylation to organoarsenicals have been observed. Despite the gaps in the literature, these preliminary, in many cases, results indicate that biological wastewater treatment processes could be used in the future for the detoxification of metal-and metalloid-laden wastewater, allowing the reuse of wastewater and sludge.

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“…Reviewing application of CE to determining different chemical species of an element was given less consideration than in the past 1. Three reviews explored the practical usefulness of CE methods for specific element speciation purposes, such as mercury 22, selenium 23 and vanadium 24, with discussions centered on sample preparation, separation conditions and detection systems. The coupling of CE with ICP‐MS was brought to light among analytical techniques enabling simultaneous determination of different actinide isotopes and oxidation states 25.…”

Section: Complementary Reviewsmentioning

confidence: 99%

Inorganic species analysis by CE – An overview for 2007–2008

Timerbaev

2009

Electrophoresis

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This review article represents the sixth in a series of reviews on CE applied to inorganic analysis, appearing in this journal, and focuses on material published in 2007-2008. As a fundamental review, it examines primarily those documents in which the emphasis is on advances in general CE methodology which are traditionally set on the attainment of higher detection sensitivity and greater preconcentration factors both in capillary and microchip separation formats. Following a major research trend of the previous review period (see A.R. Timerbaev, Electrophoresis 2007, 28, 3420-3425), publications focusing on the quantification of different element species continue to rapidly outpace other applications. A range of practicable separation and detection designs tailor-made to species-selective analysis are critically discussed in order to assess their impact on the rate of development and wide acceptance of CE in the field.

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Selenium speciation by capillary electrophoresis

Cited by 20 publications

References 34 publications

Recent advances in speciation analysis of mercury, arsenic and selenium

Recent advances in speciation analysis of mercury, arsenic and selenium

Fate and Biotransformation of Metal and Metalloid Species in Biological Wastewater Treatment Processes

Inorganic species analysis by CE – An overview for 2007–2008

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