دورية أكاديمية
X-ray Absorption and X-ray Photoelectron Spectroscopic Study of Arsenic Mobilization during Mackinawite (FeS) Oxidation
| العنوان: | X-ray Absorption and X-ray Photoelectron Spectroscopic Study of Arsenic Mobilization during Mackinawite (FeS) Oxidation |
|---|---|
| المؤلفون: | Jeong, HY, Han, YS, Hayes, KF, |
| بيانات النشر: | AMER CHEMICAL SOC US |
| سنة النشر: | 2010 |
| المجموعة: | Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
| مصطلحات موضوعية: | DISORDERED MACKINAWITE, METAL REMOBILIZATION, NATURAL-WATERS, SPECIATION, IRON, GROUNDWATER, CHEMISTRY, MECHANISM, GOETHITE, TRANSFORMATIONS |
| الوصف: | In this study we investigated the speciation of the solid-phase As formed by reacting 2 x 10(-4) M As(III) with 1.0 g/L mackinawite and the potential for these sorbed species to be mobilized (released into the aqueous phase) upon exposure to atmospheric oxygen at pH 4.9, 7.1, and 9.1. Before oxygen exposure, X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) analyses indicated that As(III) was removed from the aqueous phase by forming As(0), ASS, and surface precipitates as thioarsenites at pH 4.9 and As(0) and thioarsenite surface precipitates at pH 7.1 and 9.1. When oxygen was introduced, XAS analysis indicated that As(0) and the surface precipitates were quickly transformed, whereas ASS was persistent. During intermediate oxygen exposure times, dissolved As increased at pH 4.9 and 7.1 due to the rapid oxidation of As(0) and the slow precipitation of iron (oxyhydr)oxides, the oxidation products of mackinawite. This indicates that oxidative mobilization is a potential pathway for arsenic contamination of water at acidic to neutral pH. The mobilized As was eventually resorbed by forming edge-sharing and double-corner-sharing surface complexes with iron (oxyhydr)oxides. ; X |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| تدمد: | 0013-936X |
| العلاقة: | 44; 955; 961; ENVIRONMENTAL SCIENCE & TECHNOLOGY; SCI급, SCOPUS 등재논문; SCI; v.44; no.3; pp.955-961; 2010-OAK-0000020004; https://oasis.postech.ac.kr/handle/2014.oak/27534Test |
| DOI: | 10.1021/ES902577Y |
| الإتاحة: | https://doi.org/10.1021/ES902577YTest https://oasis.postech.ac.kr/handle/2014.oak/27534Test |
| رقم الانضمام: | edsbas.C4E2FEF4 |
| قاعدة البيانات: | BASE |
| تدمد: | 0013936X |
|---|---|
| DOI: | 10.1021/ES902577Y |