Speciation of volatile arsenic at geothermal features in Yellowstone National Park

a b s t r a c t Arsenic (As) is ubiquitous in the environment in the carcinogenic inorganic forms, posing risks to human health in many parts of the world. Many microorganisms have evolved a series of mechanisms to cope with inorganic arsenic in their growth media such as transforming As compounds into volatile derivatives. Bio-volatilization of As has been suggested to play an important role in global As biogeochemical cycling, and can also be explored as a potential method for arsenic bioremediation. This review aims to provide an overview of the quality and quantity of As volatilization by fungi, bacteria, microalga and protozoans. Arsenic bio-volatilization is influenced by both biotic and abiotic factors that can be manipulated/elucidated for the purpose of As bioremediation. Since As biovolatilization is a resurgent topic for both biogeochemistry and environmental health, our review serves as a concept paper for future research directions.

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“…• C (Planer-Friedrich et al, 2006), AsH 3 is the most volatile As gas. MeAsH 2 has a boiling point of −2…”

Section: Volatile Arsenic Speciesmentioning

confidence: 99%

“…, 2006). All four of these arsines can be produced by microbes and all of them have been detected in natural samples (Planer-Friedrich et al, 2006;Meyer et al, 2007;Mestrot et al, 2011). Another inorganic volatile As compound, diarsine (As 2 H 4 ) (bp: 100…”

Section: Volatile Arsenic Speciesmentioning

confidence: 99%

A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

Wang¹,

Sun²,

Jia³

et al. 2014

Journal of Environmental Sciences

149

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“…Since arsenic is a volatile element 32 it has an inherent problem in being extracted at high temperatures and it can be problematic to obtain total recovery. 22,33 To investigate this potential loss of arsenic and compare the extraction techniques, two common microwave digestion methods used for the studied matrices, feed grain and plant material from a MARS 6 microwave (CEM), were employed.…”

Section: Comparison With Microwave Digestionmentioning

confidence: 99%

Comparison between Ultrasound Assisted Extraction and Microwave Digestion in the Determination of Arsenic in Edible Grains

Ribeiro¹,

Vieira²,

Lobo³

et al. 2017

J. Braz. Chem. Soc.

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A comparative evaluation of arsenic extraction from grains using ultrasound assisted extraction (UAE) and microwave digestion (MW) was developed. The arsenic determination was carried out using hydride generation coupled to flame atomic absorption spectroscopy (HG-FAAS). The optimal extraction condition indicated for corn was 20% v v -1 of HCl, temperature of 67 °C and sonication time of 30 min. For bean, the optical condition was HNO 3 in a 10% v v -1 , temperature of 25 °C and sonication time of 10 min and for soybean it was 30% v v -1 HCl, temperature of 60 °C and time of 10 min. Recovery studies close to 100% in the extraction of spiked samples was achieved. The results obtained were compared with two common extraction methods for arsenic using microwave digestion and the developed methods showed a significant increase in the arsenic recovery from the samples. In the real samples it was found an arsenic concentration of 0.3 µg g -1 . The developed methods proved to be efficient at extracting the arsenic present in the studied grains, being appropriate to evaluate the risk to human consumption.

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“…Solid phase micro-extraction (SPME), cryotrapping and chemotrapping can be utilized to pre-concentrate the volatile arsenic before detection to improve analytical sensitivity. SPME fiber (PDMS, PDMS-CAR, and PDMS-CAR-DVB) were recently used to sample and concentrate volatile arsenic followed by GC-MS analysis [50]. Me 2 AsCl, followed by Me 3 As, Me 2 AsSMe and MeAsCl 2 were indentified in the gas from the Yellowstone National Park.…”

Section: Speciation Of Volatile As Speciesmentioning

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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Speciation of volatile arsenic at geothermal features in Yellowstone National Park

Cited by 87 publications

References 37 publications

A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

Comparison between Ultrasound Assisted Extraction and Microwave Digestion in the Determination of Arsenic in Edible Grains

Recent advances in speciation analysis of mercury, arsenic and selenium

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