干旱区生态环境知识资源中心(Arid): Molecular speciation controls arsenic and lead bioaccessibility in fugitive dusts from sulfidic mine tailings

Arid

DOI	10.1039/d2em00182a
	Molecular speciation controls arsenic and lead bioaccessibility in fugitive dusts from sulfidic mine tailings
	Root, Robert A.; Chorover, Jon
通讯作者	Root, RA
来源期刊	ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
ISSN	2050-7887
EISSN	2050-7895
出版年	2023
卷号	25 期号:2 页码:288-303
英文摘要	Communities nearby mine wastes in arid and semi-arid regions are potentially exposed to high concentrations of toxic metal(loid)s from fugitive dusts deriving from impoundments. To assess the relation between potentially lofted particles and human health risk, we studied the relationship between pharmacokinetic bioaccessibility and metal(loid) molecular speciation for mine tailings dust particulate matter (PM), with elevated levels of arsenic and lead (up to 59 and 34 mmol kg(-1), respectively), by coupling in vitro bioassay (IVBA) with X-ray absorption spectroscopy (XAS). Mine tailing efflorescent salts (PMES) and PM from the surface crust (0-1 cm, PMSC) and near surface (0-25 cm) were isolated to <10 mu m and <150 mu m effective spherical diameter (PM10 and PM150) and reacted with synthetic gastric and lung fluid for 30 s to 100 h to investigate toxic metal(loid) release kinetics. Bioaccessible (BAc) fractions of arsenic and lead were about 10 and 100 times greater in gastric than in lung fluid simulant, respectively, and 10-100% of the maximum gastric BAc from PM10 and PM150 occurred within 30 s, with parabolic dissolution of fine, highly-reactive particles followed by slower release from less soluble sources. Evaporite salts were almost completely solubilized in gastric-fluid simulants. Arsenate within jarosite and sorbed to ferrihydrite, and lead from anglesite, were identified by XAS as the principal contaminant sources in the near surface tailings. In the synthetic lung fluid, arsenic was released continuously to 100 h, suggesting that residence time in vivo must be considered for risk determination. Analysis of pre- and post-IVBA PM indicated the release of arsenic in lung fluid was principally from arsenic-substituted jarosite, whereas in synthetic gastric fluid arsenic complexed on ferrihydrite surfaces was preferentially released and subsequently repartitioned to jarosite-like coordination at extended exposures. Lead dissolved at 30 s was subsequently repartitioned back to the solid phase as pyromorphite in phosphate rich lung fluid. The bioaccessibility of lead in surface tailings PM was limited due to robust sequestration in plumbojarosite. Kinetic release of toxic elements in both synthetic biofluids indicated that a single IVBA interval may not adequately describe release dynamics.
类型	Article
语种	英语
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:000866411300001
WOS关键词	IN-VITRO DIGESTION ; RELATIVE BIOAVAILABILITY ; FERRIC ARSENATE ; TISSUE DOSIMETRY ; PARTICLE-SIZE ; SOIL ; RISK ; FERRIHYDRITE ; METABOLISM ; EXPOSURE
WOS类目	Chemistry, Analytical ; Environmental Sciences
WOS研究方向	Chemistry ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396296
推荐引用方式 GB/T 7714	Root, Robert A.,Chorover, Jon. Molecular speciation controls arsenic and lead bioaccessibility in fugitive dusts from sulfidic mine tailings[J],2023,25(2):288-303.
APA	Root, Robert A.,&Chorover, Jon.(2023).Molecular speciation controls arsenic and lead bioaccessibility in fugitive dusts from sulfidic mine tailings.ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS,25(2),288-303.
MLA	Root, Robert A.,et al."Molecular speciation controls arsenic and lead bioaccessibility in fugitive dusts from sulfidic mine tailings".ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS 25.2(2023):288-303.