Premium
Stabilization of Heavy Metals in Contaminated Sediments Using Organic Chelating Agents
Author(s) -
Xu Ying,
Fang ShengRong
Publication year - 2015
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 - 10.1002/j.1554-7531.2015.tb00140.x
Subject(s) - chelation , chemistry , metal , sediment , organic matter , environmental chemistry , heavy metals , ammonium , leachate , potassium , fraction (chemistry) , contamination , nuclear chemistry , inorganic chemistry , chromatography , organic chemistry , geology , paleontology , biology , ecology
A stabilization treatment for heavy metals in sediments was developed using the heavy metal chelators ammonium dipropyl dithiophosphate (ADD) and potassium diisopropyl dithiophosphate (PDD). The results indicate that 7% ADD and 7% PDD achieved Pb and Cu stabilization rates of up to 99%, Cd stabilization rates of 78% and 95%, and Zn stabilization rates of 21 and 51%, respectively. At pH levels ranging from 2 to 12, the amount of heavy metals in leachate from the stabilized product using the chelating agents were significantly less than those using Na 2 S and Na 3 PO 4 . After treatment, the chelating agents were mainly bound to the exchangeable fraction of heavy metals in the sediment and formed stable bonds with organic matter, thus significantly reducing the biological risks of heavy metals in sediment.