Open AccessIn situ EXAFS study of copper in the electrokinetic remediation process
Author(s) -
Liu S.H.,
Wang H. Paul,
Wang H.C.,
Yang Y. W.
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500020628
Subject(s) - extended x ray absorption fine structure , copper , chemistry , in situ , x ray absorption spectroscopy , spectroscopy , analytical chemistry (journal) , absorption spectroscopy , environmental chemistry , physics , organic chemistry , quantum mechanics
The speciation of copper in the early stage of the electrokinetic remediation (EKR) process has been studied by extended X‐ray absorption fine structure (EXAFS) spectroscopy in the present work. By in‐situ EXAFS, we found that copper in a contaminated soil possessed a Cu‐O bond distance of 1.98 Å with a coordination number (CN) of 5.8. In the second shell, the bond distance of Cu‐(O)‐Cu was 2.87 Å with a CN of 6.4. However, possibly due to the fact that incompact copper atoms in the outer shells were distorted by EKR, the Cu‐(O)‐Cu (2nd shell) bond distance and the CN of copper in the contaminated soil decreased by 0.08 Å and 5.4, respectively in the early stage of the EKR process. Interestingly, after prolonging the contact time to about 80 minutes, the 1st‐shell copper atoms were also perturbed by EKR. This work is an example of usefulness of the in‐situ EXAFS spectroscopy for detailed studies of the speciation of copper in the contaminated soil during EKR process.