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Use of cyclodextrin and calcium chloride for enhanced removal of mercury from soil
Author(s) -
Wang Xiaojiang,
Yolcubal Irfan,
Wang Weizi,
Artiola Janick,
Maier Raina,
Brusseau Mark
Publication year - 2004
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/03-379
Subject(s) - mercury (programming language) , chemistry , reagent , adsorption , elution , sorbent , chloride , environmental chemistry , soil water , calcium , cyclodextrin , chromatography , soil contamination , soil science , environmental science , organic chemistry , computer science , programming language
The use of solutions containing carboxymethyl‐β‐cyclodextrin (CMCD) or CaCl 2 for enhancing the removal of Hg from a sandy soil was investigated using batch and column experiments. The retention of Hg appeared to be controlled by specific adsorption reactions, which greatly constrained Hg removal when using water (KNO 3 solution) to flush columns packed with contaminated soil. The results showed that the two reagents did enhance the removal of Hg from the soil. For example, 81% and 60% of Hg was recovered after 50 pore volumes of flushing with 50 mM CaCl 2 and 2 mM CMCD, respectively, compared to 24% recovery for a 10 mM KNO 3 solution. However, significant tailing and delayed recovery of Hg during the elution process occurred in the presence of all reagents, indicating that the removal of Hg from the soil was rate limited.