Speciation of As in the blackfoot disease endemic area.
Speciation of arsenic (As) in well water and contaminated soil in the blackfoot disease endemic area has been studied by extended X-ray absorption fine structural (EXAFS) spectroscopy in the present work. Experimentally, we found that arsenic in the well water possessed an As-O bond distance of 1.72 A with a coordination number (CN) of 4.3. In the blackfoot disease area, arsenic with a high oxidation state (As(V)) was also observed in the contaminated soil. In the early stage (after 90 minutes) of the electrokinetic remediation (EKR) of the contaminated soil, the in-situ EXAFS data indicated that the CN of As-O (1st shell) decreased slightly, that may be due to the perturbation of the incompact As atoms in the outer shells by EKR.
Wang
H C
HC
Department of Environmental Engineering, National Cheng Kung University, Tainan City, Taiwan. wanghp@mail.ncku.edu.tw
Wang
H P
HP
Peng
C Y
CY
Liu
S H
SH
Yang
Y W
YW
D001151:Arsenic / Q000009:adverse effects / Q000032:analysis / Q000737:chemistry*; D004563:Electrochemistry; D019353:Endemic Diseases; D006801:Humans; D007700:Kinetics; D016491:Peripheral Vascular Diseases / Q000139:chemically induced* / Q000453:epidemiology*; D012037:Refuse Disposal / Q000379:methods; D012989:Soil Pollutants / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000009:adverse effects / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D001151:Arsenic