东北典型遗留铬渣堆放场土壤Cr污染及运移特征

Soil pollution and transport characteristics of Cr in the typical leftover chrome slag storage site in northeast China

原铬盐生产企业堆存铬渣虽然已无害化处置,但堆放场遗留的土壤污染问题仍十分严重,含Cr化合物在不同性质土壤中的迁移特征具有典型性。针对东北某大型遗留铬渣堆放场地,开展了典型土壤介质的Cr污染分布及迁移特征研究。结果表明,土壤渗透性和酸碱度对于总Cr和Cr(Ⅵ)在土壤中的浓度分布特征有明显影响,Cr(Ⅵ)更易在下层渗透性差的土层聚积,弱酸性条件下更适宜含Cr化合物在土壤中的迁移。因此,在进行此类污染场地调查时,应充分考虑不同土壤介质渗透性及酸碱度对Cr污染分布的影响,进一步提高调查结果准确性。

Although the chromium slag has been disposed harmlessly,the problem of soil pollution left in the storage site is still very serious.The Cr in soil with different properties shows typical migration characteristics.A study on the distribution and migration characteristics of Cr pollution in typical soil medium is carried out for a large-scale leftover chromium slag stacking site in Northeast China.The results show that the permeability and pH of the soil are seriously affected on the concentration distribution characteristics of total Cr and Cr(Ⅵ)in soil.Cr(Ⅵ)is more likely to accumulate in the lower soil layer with a poor permeability,and it is more suitable for the migration of Cr in the soil under weakly acidic conditions.Therefore,in the investigation of such polluted sites,the influence of the permeability and pH of the soil on the distribution of Cr pollution should be fully considered to further improve the accuracy of the survey results.