Xu Ying, Fang Sheng-Rong
Water Environ Res. 2015 Jan;87(1):52-60.
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 Na2S and Na3PO4. 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.
利用重金属螯合剂二丙基二硫代磷酸铵（ADD）和二异丙基二硫代磷酸钾（PDD）开发了一种沉积物中重金属的稳定化处理方法。结果表明，7%的ADD和7%的PDD分别使铅和铜的稳定率高达99%，镉的稳定率分别为78%和95%，锌的稳定率分别为21%和51%。在pH值为2至12的范围内，使用螯合剂的稳定化产物渗滤液中的重金属含量明显低于使用硫化钠和磷酸钠的情况。处理后，螯合剂主要与沉积物中重金属的可交换部分结合，并与有机物形成稳定的键，从而显著降低了沉积物中重金属的生物风险。
