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Investigating the Transformations of Arsenic and Toxic Metal(loid)s Speciation and the Impact on Arsenic Bioaccessibility in Particulate Matter From Mine Tailings Sites Distributed in Different Climates
Investigating the Transformations of Arsenic and Toxic Metal(loid)s Speciation and the Impact on Arsenic Bioaccessibility in Particulate Matter From Mine Tailings Sites Distributed in Different Climates
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105125
- ISBN
- 9798291587515
- DDC
- 577
- 서명/저자
- Investigating the Transformations of Arsenic and Toxic Metal(loid)s Speciation and the Impact on Arsenic Bioaccessibility in Particulate Matter From Mine Tailings Sites Distributed in Different Climates
- 발행사항
- [Sl] : The University of Arizona, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 196 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Chorover, Jon.
- 학위논문주기
- Thesis (Ph.D.)--The University of Arizona, 2025.
- 초록/해제
- 요약Legacy mine tailings are a persistent source of contaminant metal(loid) release, posing potential risks to human and ecosystem health. This study examines the solid-phase weathering, geochemical speciation, and bioaccessibility of arsenic (As), lead (Pb), zinc (Zn), and cadmium (Cd) in sulfidic mine tailings collected from 11 abandoned sites across a broad climatic gradient in the Western United States, ranging from arid to humid environments. Tailings were sampled from surface to 2 m depth and characterized for total metal concentrations, mineralogy, and As speciation using X-ray absorption spectroscopy. In vitro bioaccessibility assays (IVBA) were performed under gastric and intestinal conditions to assess human health risk. Arsenic weathering patterns varied with climate: arid sites exhibited surface enrichment correlated with Fe and S, while humid sites showed deeper As enrichment and near-surface depletion, reflecting oxidative translocation and secondary mineral retention. Arsenopyrite (As⁰) dominated in unweathered zones, while oxidized arsenate (As⁵⁺) was prevalent in weathered layers; As³⁺ was not detected. IVBA results revealed low As bioaccessibility (3.5%) in humid regions and moderate values (10- 36%) in arid to semi-arid sites, with site-specific mineralogy-particularly Fe-bearing phases like jarosite and ferrihydrite-playing a critical role. Pb exhibited low bioaccessibility due to transformation into stable phases (e.g., plumbojarosite), while Zn and Cd were more labile, especially under acidic conditions. Climatic conditions strongly influenced metal lability, weathering depth profiles, and associated risks, with moderate climates often presenting higher bioaccessibility. These findings underscore the importance of climate-driven geochemical processes in controlling contaminant mobility and provide insight for prioritizing remediation at legacy mining sites under future climate scenarios.
- 일반주제명
- Environmental science
- 일반주제명
- Environmental health
- 일반주제명
- Soil sciences
- 키워드
- Bioaccessibility
- 키워드
- Health risk
- 키워드
- Mine tailings
- 키워드
- Speciation
- 키워드
- Weathering
- 기타저자
- The University of Arizona Environmental Science
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105125
■006m o d
■007cr#unu||||||||
■020 ▼a9798291587515
■035 ▼a(MiAaPQ)AAI32238695
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a577
■1001 ▼aAlghzawi, Ma'in Zaid.
■24510▼aInvestigating the Transformations of Arsenic and Toxic Metal(loid)s Speciation and the Impact on Arsenic Bioaccessibility in Particulate Matter From Mine Tailings Sites Distributed in Different Climates
■260 ▼a[Sl]▼bThe University of Arizona▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a196 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Chorover, Jon.
■5021 ▼aThesis (Ph.D.)--The University of Arizona, 2025.
■520 ▼aLegacy mine tailings are a persistent source of contaminant metal(loid) release, posing potential risks to human and ecosystem health. This study examines the solid-phase weathering, geochemical speciation, and bioaccessibility of arsenic (As), lead (Pb), zinc (Zn), and cadmium (Cd) in sulfidic mine tailings collected from 11 abandoned sites across a broad climatic gradient in the Western United States, ranging from arid to humid environments. Tailings were sampled from surface to 2 m depth and characterized for total metal concentrations, mineralogy, and As speciation using X-ray absorption spectroscopy. In vitro bioaccessibility assays (IVBA) were performed under gastric and intestinal conditions to assess human health risk. Arsenic weathering patterns varied with climate: arid sites exhibited surface enrichment correlated with Fe and S, while humid sites showed deeper As enrichment and near-surface depletion, reflecting oxidative translocation and secondary mineral retention. Arsenopyrite (As⁰) dominated in unweathered zones, while oxidized arsenate (As⁵⁺) was prevalent in weathered layers; As³⁺ was not detected. IVBA results revealed low As bioaccessibility (3.5%) in humid regions and moderate values (10- 36%) in arid to semi-arid sites, with site-specific mineralogy-particularly Fe-bearing phases like jarosite and ferrihydrite-playing a critical role. Pb exhibited low bioaccessibility due to transformation into stable phases (e.g., plumbojarosite), while Zn and Cd were more labile, especially under acidic conditions. Climatic conditions strongly influenced metal lability, weathering depth profiles, and associated risks, with moderate climates often presenting higher bioaccessibility. These findings underscore the importance of climate-driven geochemical processes in controlling contaminant mobility and provide insight for prioritizing remediation at legacy mining sites under future climate scenarios.
■590 ▼aSchool code: 0009.
■650 4▼aEnvironmental science
■650 4▼aEnvironmental health
■650 4▼aSoil sciences
■653 ▼aBioaccessibility
■653 ▼aContaminant mobility
■653 ▼aHealth risk
■653 ▼aMine tailings
■653 ▼aSpeciation
■653 ▼aWeathering
■690 ▼a0768
■690 ▼a0470
■690 ▼a0481
■71020▼aThe University of Arizona▼bEnvironmental Science.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0009
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359480▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
