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Decontamination of Aquatic Vegetable Leaves by Removing Trace Toxic Metals during Pickling Process with Acetic Acid Solution

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The heavy-metal content of aquatic plants is mainly dependent upon their ecological system. This study indicated that although the toxic heavy-metal contents could be above the recommended maximum levels depending upon their concentrations in growing water, they can be decontaminated by pickling with 5% acetic acid solution. Almost all Cd, Hg, Ba, or Sb and 99.5% Pb, 96.7% Ag, or 97.1% Al were removed from Water Spinach leaves by soaking in acetic acid solution. For Water-Shield leaves, almost all Cd, Hg, Pb, Ba, or Sb and 95.0% Ag or 96.1% Al were removed. For Watercress leaves, almost all Cd, Hg, Ba, or Sb and 99.0% Pb or 99.7% Ag were removed. For Water Hyacinth leaves, almost all Cd, Ba, or Sb and 99.0% Hg, 98.5% Pb, 95.0% Ag, or 98.7% Al were removed.

Keywords: acetic acid extraction; aquatic vegetable leaves; decontamination; method; toxic metals

Document Type: Research Article


Affiliations: 1: College of Food Science,Southwest University, People's Republic of China 2: School of Public Health,Dali University, Dali, People's Republic of China

Publication date: 2011-07-01

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