Device for the removal and concentration of ionic metal species from water
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United States of America Patent
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Oct 2, 2001
Grant Date -
N/A
app pub date -
Mar 3, 1999
filing date -
Mar 3, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device is provided for capturing ionic metal species (e.g., Cd, Cu, Ni, Pb and Zn) dissolved in water. The device includes a nonporous polymeric tube for capturing the dissolved ionic metal species. The tube is formed from a membrane having transient cavities therein having an average pore size greater than 10 .ANG.. A sequestration medium, contained within the tube, transforms the ionic metal species captured by the tube into a complexed, non-mobile metal species. The sequestration medium is capable of diffusing through the nonporous polymeric membrane at a controlled rate to form the complexed, non-mobile species and can comprise a mixture and metal complexing agent (e.g., a quinoline) and a long chain organic acid (e.g., oleic acid).
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