三峡上游支流梁滩河底泥重金属分布及稳定化

本文以梁滩河河道底泥为研究对象，对不同监测断面39个底泥样品的重金属含量及分布进行了测定，同时选取其中五个底泥样品，利用纳米铁粉对底泥中重金属进行了稳定化处理，并通过XRD分析对其稳定化机理进行了探讨。研究结果表明，梁滩河底泥已经不同程度的受到了Cu、Pb、As、Zn、Cd、Cr等重金属的污染，其中As的污染程度最为严重，最高值达到了土壤背景值的110倍。添加纳米铁粉稳定化试剂后，As、Zn、Pb、Cr、Cu、Hg等重金属的浸出浓度都得到了较大程度的降低；XRD分析结果表明添加纳米铁后，重金属的化学形态由游离态转变为稳定态是重金属浸出浓度降低的主要原因之一。

Heavy Metal Distribution and Stabilizing Effects Mechanism of Liangtan River Sediments

This paper studied Liangtan River sediments , having measured heavy metal contents and distribution in 39 sediment samples of different monitoring sections. Choosing nano-scale iron to determine its effects on heavy metal stabilization in five contaminated sediment , and analysing its stabilization mechanism by XRD. The results show that the sediments in Liangtan River has been polluted by Cu, Pb, As, Zn, Cd, Cr:As was the most polluted, the highest value had reached 110 times of the soil background value. After adding nano-scale iron, the concentrations of As, Zn, Pb, Cr, Cu, Hg were highly reduced; XRD analysis shows that the chemical form of heavy metals changing from the free state to steady-state is one of the main reasons for the reduction of the leaching toxicity after adding nano-scale iron.