Overview and challenges of mercury fractionation and speciation in soils

Reis, Ana Teresa; Davidson, Christine M.; Vale, Carlos; Pereira, Eduarda

doi:10.1016/j.trac.2016.05.008

Cited by 79 publications

(30 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Unfortunately, the study of solid-phase Hg speciation in soils is not a straightforward task. Various extraction-based techniques have been developed to divide Hg-species into "operationally-defined" pools, but they can be prone to artifacts [27][28][29][30]. More direct information about the dominating Hg species in soils can be obtained by synchrotron X-ray absorption spectroscopy (XAS) with linear combination fitting analysis based on known reference compounds; however, this technique requires high Hg concentrations and also has its limitations.…”

Section: Introductionmentioning

confidence: 99%

Speciation and Mobility of Mercury in Soils Contaminated by Legacy Emissions from a Chemical Factory in the Rhône Valley in Canton of Valais, Switzerland

et al. 2018

View full text Add to dashboard Cite

Legacy contamination of soils and sediments with mercury (Hg) can pose serious threats to the environment and to human health. Assessing risks and possible remediation strategies must consider the chemical forms of Hg, as different Hg species exhibit vastly different environmental behaviors and toxicities. Here, we present a study on Hg speciation and potential mobility in sediments from a chemical factory site, and soils from nearby settlement areas in the canton of Valais, Switzerland. Total Hg ranged from 0.5 to 28.4 mg/kg in the soils, and 3.5 to 174.7 mg/kg in the sediments, respectively. Elemental Hg(0) was not detectable in the soils by thermal desorption analysis. Methylmercury, the most toxic form of Hg, was present at low levels in all soils (<0.010 mg/kg; <0.8% of total Hg). Sequential extractions and thermal desorption analyses suggested that most of the Hg in the soils was present as “matrix-bound Hg(II)”, most likely associated with soil organic matter. For factory sediments, which contained less organic matter, the results suggested a higher fraction of sulfide-bound Hg. Batch extractions in different CaCl2 solutions revealed that Hg solubility was low overall, and there was no Hg-mobilizing effects of Ca2+ or Cl− in solution. Only in some of the factory sediments did high CaCl2 concentrations result in increased extractability of Hg, due to the formation of Hg-chloride complexes. Additional experiments with soil redox reactors showed that even mildly reducing conditions led to a sharp release of Hg into solution, which may be highly relevant in soils that are prone to periodic water saturation of flooding.

show abstract

Section: Introductionmentioning

confidence: 99%

Speciation and Mobility of Mercury in Soils Contaminated by Legacy Emissions from a Chemical Factory in the Rhône Valley in Canton of Valais, Switzerland

et al. 2018

View full text Add to dashboard Cite

show abstract

“…La técnica de absorción es ampliamente usada para la investigación en laboratorios, así como en la industria alimenticia, investigación ambiental, farmacéutica, y otros sectores. Como tal esta técnica presenta la particularidad de permitir la atomización de la muestra a analizar por medio de tres procesos diferentes los cuales son: espectrometría de absorción atómica por flama (FAAS), por atomización electrotérmica (ETAAS) y por generación de vapores químicos o de hidruros (CVG-AAS) [31]- [33]. Sin embargo, en la elección de la técnica adecuada entre los factores que afectan: están la naturaleza quimia del analito y su contenido en el tipo de muestra a analizar, además de la composición de la muestra y su estado físico.…”

Section: A Espectrometría De Absorción Atómicaunclassified

Contaminación del agua por metales pesados, métodos de análisis y tecnologías de remoción. Una revisión

et al. 2020

View full text Add to dashboard Cite

Los sistemas de producción industrial actuales usan metales pesados para la extracción de un material o como elemento en la refinación de un producto en particular lo que en principio resulta en la obtención del producto deseado con relativos bajos costos de producción. Sin embargo, usar estos metales presenta un grave problema a nivel ambiental debido a sus altos niveles de toxicidad para los organismos con los que interactúen una vez son descargados. Por tanto, se han desarrollado diversos métodos para tratar con estos metales una vez están en el agua y los métodos para analizarlos. Se realizó una búsqueda amplia y actualizada de las fuentes, efectos y toxicidad en los seres vivos, métodos de análisis y las diversas técnicas de tratamiento existentes para metales pesados. Como resultado el investigador estará más preparado al tener información actual sobre los tratamientos a tener en cuenta en la manipulación de metales pesados.

show abstract

“…Soil is an important reservoir of anthropogenic Hg release, playing a key role in the Hg cycle [ 82 ]. The soil environment is a heterogenous micro-landscape of solid-solution-gas interfaces, and fluxes between these compartments are dominated by the soil phase characteristic/composition, where partitioning of the Hg is concentrated.…”

Section: The Use Of Fmsn In Dgt Researchmentioning

confidence: 99%

Functionalized Mesoporous Silicon Nanomaterials in Inorganic Soil Pollution Research: Opportunities for Soil Protection and Advanced Chemical Imaging

et al. 2020

View full text Add to dashboard Cite

Innovative actions towards a pollution free-planet" is a goal of the United Nations Environment Assembly (UNEA). Aided by both the Food and Agricultural Organisation (FAO) and its Global Soil Partnership under the 3rd UNEA resolution, a consensus from > 170 countries have agreed a need for accelerated action and collaboration to combat soil pollution. This initiative has been tasked to find new and improved solutions to prevent and reduce soil pollution, and it is in this context that this review provides an updated perspective on an emerging technology platform that has already provided demonstrable utility for measurement, mapping, and monitoring of toxic trace elements (TTEs) in soils, in addition to the entrapment, removal, and remediation of pollutant sources. In this article, the development and characteristics of functionalized mesoporous silica nanomaterials (FMSN) will be discussed and compared with other common metal scavenging materials. The chemistries of the common functionalizations will be reviewed, in addition to providing an outlook on some of the future directions/applications of FMSN. The use of FMSN in soil will be considered with some specific case studies focusing on Hg and As. Finally, the advantages and developments of FMSN in the widely used diffusive gradients-in-thin films (DGT) technique will be discussed, in particular, its advantages as a DGT substrate for integration with oxygen planar optodes in multilayer systems that provide 2D mapping of metal pollutant fluxes at submillimeter resolution, which can be used to measure detailed sediment-water fluxes as well as soil-root interactions, to predict plant uptake and bioavailability.

show abstract

Overview and challenges of mercury fractionation and speciation in soils

Cited by 79 publications

References 71 publications

Speciation and Mobility of Mercury in Soils Contaminated by Legacy Emissions from a Chemical Factory in the Rhône Valley in Canton of Valais, Switzerland

Speciation and Mobility of Mercury in Soils Contaminated by Legacy Emissions from a Chemical Factory in the Rhône Valley in Canton of Valais, Switzerland

Contaminación del agua por metales pesados, métodos de análisis y tecnologías de remoción. Una revisión

Functionalized Mesoporous Silicon Nanomaterials in Inorganic Soil Pollution Research: Opportunities for Soil Protection and Advanced Chemical Imaging

Contact Info

Product

Resources

About