固化剂对土壤重金属的固化作用及其机理

摘要：大量研究表明一些固化剂对土壤重金属的生物有效性有一定影响。本文设置土柱淋溶实验，研究了不同固化剂（磷酸二氢钾、坡缕石、纳米二氧化硅、粉煤尘和钢渣）对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响。结果表明，钢渣和粉煤灰对Zn的有显著的活化作用，与其导致土壤颗粒的比表面积及孔容显著降低有关。KH2PO4处理3天后，对锌有显著的固化作用，可能与土壤pH值被改变有关。坡缕石和5%的纳米二氧化硅处理3天后对锌有显著的固化作用，这可能与坡缕石增加了土壤颗粒的比表面积和总微体积有关。72414

关键词：固化剂；重金属；迁移性；土壤理化性质

The Solidification for Amendment to Affect Heavy Metal Soil Pollution and Its Mechanization

Abstract：some researches suggested that soil amendments could influence the bioavailability of heavy metals in the soil samples。 In this study, we simultaneously investigated the effects of different amendment (monopotassium phosphate, palygorskite, nano silica powder, coal dust and slag) on the content of Cu ion and Zn ion in the calcium chloride extraction of soil samples treated by EDDS drench solution under the soil column leaching experiment。 Our results demonstrate that coal dust and slag had significant activation effect on Zn ion in the soil samples, which was related to the significant decrease of the specific surface area and the pore volume of soil particles。 While after 3 days, treated by monopotassium phosphate, the soil samples which have been treated have a significant curing effect on zinc ion in the soil samples, which may be related to the change of soil samples pH。 And after 3 days, treated by palygorskite and 5% of nano silica powder, the soil samples which have been treated have a significant curing effect on zinc ion in the soil samples, which may be related to the increase of soil specific surface area and total micro volume of soil samples under the effects of the palygorskite and nano silica powder。

Key words: Amendment; Heavy metal soil; Mobility; Soil physicochemical properties

摘要： 1

关键词： 1

Abstract：。 1

Key words: 1

前言: 2

1 材料与方法 3

1。1 供试材料 3

1。2 实验设计 3

1。3 分析测试方法 4

1。4 数据处理 4

2结果与分析 4

2。1固化剂对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响 4

2。1。1磷酸二氢钾对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响 4

2。1。2坡缕石对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响 5

2。1。3纳米二氧化硅对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响 5

2。1。4粉煤渣对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响 5

2。1。5钢渣对EDDS淋溶液处理土壤CaCl2提取态Cu、Zn含量的影响 5

2。2固化剂对重金属污染土壤理化性质的影响 6

2。2。1固化剂对重金属污染土壤比表面积的影响 6

2。2。2固化剂对重金属污染土壤BJH中值孔径固化剂对土壤重金属的固化作用及其机理:http://www.youerw.com/huaxue/lunwen_82389.html