@@ 引言rn底泥是各种来源的营养物质进入水体后,经沉淀、吸附、生物吸收等多种途径最终沉积于水体底部,形成疏松状、富含有机质和营养盐的灰黑色淤泥.因此沉积物曾一度被看作是水体环境各种污染物质的最终储存场所.底泥中含有丰富的有机质、腐殖质,是一种良好的有机肥料[1-2],因此,土地利用是底泥资源化处置利用的重要方式.英、法等发达国家疏浚底泥的农用率高,而我国利用率相当低[3].%A new type of heavy metal chelating agent, potassium diisopropyl dithiophosphate was synthesized and the treatment of sediment contaminated by heavy metals hy this chelator was investigated. The results indicated that when the dosage of potassium diisopropyl dithiophosphate was 3 ％(mass), the stabilization rate of heavy metals in sediment, such as Ph, Cu, Cd, could reach more than 85％, and the effect was better than inorganic stabilization chemicals, like Na2S and Na3PO4. After treatment the sediment could meet the US standards for heavy metals waste landfill. Meanwhile, the maximum leaching capacity of the treated sediment was much lower than the case with inorganic stabilization chemicals, and such stabilization effect could be obtained in a wide range of pH. The heavy metals in sediment after treatment could be transformed from exchangeable to organically bound and residue, reducing secondary contamination risk when the environment has changed.
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