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Chelating extraction of copper from soil using s‐carboxymethylcysteine
Author(s) -
Hong Andrew,
Chen TingChien,
Okey Robert W.
Publication year - 1995
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143095x133202
Subject(s) - chelation , copper , extraction (chemistry) , chemistry , soil contamination , environmental chemistry , heavy metals , metal , nuclear chemistry , soil water , inorganic chemistry , chromatography , environmental science , organic chemistry , soil science
Heavy metal contamination of soil frequently occurs at hazardous waste sites. The use of chelating agents to extract heavy metals from contaminated soils is seen as a treatment method. This research investigated the use of the chelator S‐carboxymethylcysteine (SCMC) to extract copper from a spiked soil. Batch equilibration experiments over 24‐hour periods tested the hypotheses that through a proper choice of chelator extraction could be made more selective toward heavy metals, and extracted metals could be readily recovered as precipitates by increasing the solution pH. The results showed that SCMC could extract and release copper reversibly and that SCMC prefers complexing with copper over competing Fe and Ca ions. Chemical equilibrium modeling was useful for selecting suitable chelating agents for the extraction and subsequent treatment conditions for metals recovery.