Assessment of arsenic speciation and bioaccessibility in mine-impacted materials

Ollson, Cameron J.; Smith, Euan; Scheckel, Kirk G.; Betts, Aaron R.; Juhasz, Albert L.

doi:10.1016/j.jhazmat.2016.03.090

Cited by 33 publications

(46 citation statements)

References 38 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concentration of As was the highest in CMW (15240±190 mg/kg), followed by SH15 (2010±17.2 mg/kg) and PP (160±0.8 mg/kg). Similar to CMW, elevated As concentrations in soil samples from gold mining regions have been reported previously (Meunier et al, 2010) and may be associated with the sulphidic phases in gold ores (Ollson et al, 2016). The results of speciation analysis demonstrated that the majority of the As present in all three samples was sorbed species (70-90%) with the remainder present as scorodite and beudantite ( Table 2).…”

Section: Physico-chemical Characteristics Of Mining/smelting Impactedsupporting

confidence: 68%

Methodological factors influencing inhalation bioaccessibility of metal(loid)s in PM2.5 using simulated lung fluid

Kastury

Smith

Karna³

et al. 2018

Environmental Pollution

Self Cite

View full text Add to dashboard Cite

In this study, methodological factors influencing the dissolution of metal(loid)s in simulated lung fluid (SLF) was assessed in order to develop a standardised method for the assessment of inhalation bioaccessibility in PM. To achieve this aim, the effects of solid to liquid (S/L) ratio (1:100 to 1:5000), agitation (magnetic agitation, occasional shaking, orbital and end-over-end rotation), composition of SLF (artificial lysosomal fluid: ALF; phagolysosomal simulant fluid: PSF) and extraction time (1-120 h) on metal(loid) bioaccessibility were investigated using PM from three Australian mining/smelting impacted soils and a certified reference material. The results highlighted that SLF composition significantly (p < 0.001) influenced metal(loid) bioaccessibility and that when a S/L ratio of 1:5000 and end-over-end rotation was used, metal(loid) solubility plateaued after approximately 24 h. Additionally, in order to assess the exposure of metal(loid)s via incidental ingestion of surface dust, PM was subjected to simulated gastro-intestinal tract (GIT) solutions and the results were compared to extraction using SLF. Although As bioaccessibility in SLF (24 h) was significantly lower than in simulated GIT solutions (p < 0.05), Pb bioaccessibility was equal to or significantly higher than that extracted using simulated GIT solutions (p < 0.05).

show abstract

Section: Physico-chemical Characteristics Of Mining/smelting Impactedsupporting

confidence: 68%

Methodological factors influencing inhalation bioaccessibility of metal(loid)s in PM2.5 using simulated lung fluid

Kastury

Smith

Karna³

et al. 2018

Environmental Pollution

Self Cite

View full text Add to dashboard Cite

show abstract

“…Speciation of metal(loid)s of interest (As, Fe and Pb) was determined using X-ray absorption spectroscopy (XAS) (MRCAT beamlines 10-ID (Pb) and 10-BM (As and Fe), Sector 10 (Segre et al, 2000;Kropf et al, 2010), at the Advanced Photon Source of the Argonne National Laboratory, U.S) according to methodologies detailed in (Ollson et al, 2016).…”

Section: Physico-chemical Characterizationmentioning

confidence: 99%

An inhalation-ingestion bioaccessibility assay (IIBA) for the assessment of exposure to metal(loid)s in PM10

Kastury

Smith

Karna³

et al. 2018

Science of The Total Environment

Self Cite

View full text Add to dashboard Cite

Although metal(loid) bioaccessibility of ambient particulate matter, with an aerodynamic diameter of <10μm (PM), has recently received increasing attention, limited research exists into standardising in-vitro methodologies using simulated lung fluid (SLF). Contradictions exist regarding which assay parameters should be adopted. Additionally, potential continuation of metal(loid) dissolution once PM is cleared from the lungs and passed through the gastro-intestinal tract (GIT) has rarely been addressed. The objective of this study was to assess parameters that influence inhalation bioaccessibility in order to develop a conservative assay that is relevant to a human inhalation scenario. To achieve this aim, the effect of solid to liquid (S/L) ratio, extraction time, agitation and five major SLF compositions on the bioaccessibilities of arsenic (As) and lead (Pb) was investigated using PM from three Australian mining/smelting impacted regions. Using the biologically relevant parameters that resulted in the most conservative outcomes, bioaccessibility of metal(loid)s in PM was assessed in SLF, followed by simulated GIT solutions. Results from this study revealed that fluid composition and S/L ratio significantly affected metal(loid) dissolution (p<0.05). The highest Pb bioaccessibility resulted using simulated lung-gastric solution, while that of As resulted using simulated lung-gastric-small intestinal tract solutions. Compared to SLF alone, metal(loid) dissolution using the inhalation-ingestion bioaccessibility assay (IIBA) was significantly higher (p<0.05) for all PM samples.

show abstract

“…Indeed, As is oxidised to arsenite to then precipitate during roasting from vapours to become As 2 O 3 . Several studies report an association of As with gold deposits containing sulphide minerals (Antwi-Agyei, Hogarh, & Foli, 2009;Bisone et al, 2016;Chakraborti et al, 2013;Houben, D'Onofrio, Kokelj, & Blais, 2016;Nyanza, Dewey, Thomas, Davey, & Ngallaba, 2014;Ollson, Smith, Scheckel, Betts, & Juhasz, 2016;Ono, Tappero, Sparks, & Guilherme, 2016;Toujaguez et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Artisanal gold‐mining in a rural environment: Land degradation in Kenya

Odumo

Nanos²,

Carbonell³

et al. 2018

Land Degrad Dev

View full text Add to dashboard Cite

Artisanal gold‐mining (AGM) is one of the most important activities in the districts of Migori and Transmara (Kenya). Gold‐mining, however, is known to release vast quantities of arsenic and metals (some of which are very toxic like As, Hg, Cd, or Pb), which poses a serious threat to not only miners but also to the ecosystem and local populations. We, herein, determine the concentrations of arsenic and some heavy metals in several sample types (i.e., ore, soil, river sediment, and mine tailing) collected from the districts of Migori and Transmara. We also employ lichens and mosses as pollution bioindicators. Geostatistical tools and canonical correlation analysis were used to identify the relevant factors that affected arsenic and metal concentrations in the analysed samples. The following concentration ranges were reported in topsoil: As (1–17,250 mg kg−1), Cd (0.01–15.10 mg kg−1), Cu (7–9,238 mg kg−1), Cr (1–214 mg kg−1), Ni (5–766 mg kg−1), Pb (3–1,149 mg kg−1), and Zn (22–1,271 mg kg−1). It was concluded that the ecosystem in both districts was highly polluted by heavy metals whereas the arsenic concentrations in topsoil were among the highest reported worldwide. The results of this study provide new evidence on the impact of AGM on the environment and may further contribute to the design of policy measures with the aim of reducing environmental and human health risks associated to AGM activities.

show abstract

Assessment of arsenic speciation and bioaccessibility in mine-impacted materials

Cited by 33 publications

References 38 publications

Methodological factors influencing inhalation bioaccessibility of metal(loid)s in PM2.5 using simulated lung fluid

Methodological factors influencing inhalation bioaccessibility of metal(loid)s in PM2.5 using simulated lung fluid

An inhalation-ingestion bioaccessibility assay (IIBA) for the assessment of exposure to metal(loid)s in PM10

Artisanal gold‐mining in a rural environment: Land degradation in Kenya

Contact Info

Product

Resources

About