Open AccessChromium speciation in residues after sequential extraction of a thermally treated sludge analog
Author(s) -
Wei YuLing,
Yang YawWen,
Lee JyuFu,
Huang MuYu,
Hsu LeeHow
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/s0909049500020641
Subject(s) - xanes , extended x ray absorption fine structure , chromium , genetic algorithm , spectral line , leaching (pedology) , chemistry , extraction (chemistry) , inorganic chemistry , analytical chemistry (journal) , materials science , nuclear chemistry , absorption spectroscopy , environmental chemistry , organic chemistry , soil water , physics , environmental science , quantum mechanics , astronomy , evolutionary biology , soil science , biology
XANES fitting indicates that non‐Cr 2 O 3 form of Cr(III), transformed from CrO 3 by four‐hour heat application at 1100°C, is the key species sorbed onto or lattice‐diffused into kaolin matrices that exhibits strong leaching resistance to sequential extraction using various combined solutions including HNO 3 , H 2 O 2 , and HF. The EXAFS spectra are all in agreement with the XANES results. It is suggested that some Cr 2 O 3 might have reacted with kaolin to form new compounds such as Cr 2 O 3 ˙Al 2 O 3 ˙2SiO 2 to account for the slight dissimilarity between the EXAFS spectra of samples and that of Cr 2 O 3 .