深圳市城市绿地土壤中重金属的含量及化学形态分布  

CONCENTRATION AND CHEMICAL FRACTIONATION OF HEAVY METALS IN SOILS OF URBAN GREEN SPACE IN SHENZHEN CITY

作　　者：卢瑛[1] 甘海华[1] 张波[2] 史正军 

机构地区：[1]华南农业大学资源环境学院,广州510642 [2]华南农业大学园林公司,广州510642 [3]深圳市园林科学研究所,深圳518003

出　　处：《环境化学》2009年第2期284-288,共5页Environmental Chemistry

基　　金：广东省科技计划项目(2004B33301012)

摘　　要：对深圳市中心区城市绿地表层土壤(0—20cm)中Cu,Zn,Pb和Cd的含量、化学形态分布和迁移性进行研究.结果表明,土壤中Cu,Zn,Pb和Cd的含量分别为6.4—188.2(26.3)mg·kg-1,34.9—284.8(69.1)mg·kg-1,15.2—245.5(47.2)mg·kg-1和0.01—3.48(0.47)mg·kg-1.道路绿化带土壤中Cu,Zn和Pb的平均含量最高,在公园绿地土壤中Cd的平均含量最高.分别有75.6%,87.0%,98.8%和98.8%的土壤中Cu,Zn,Pb和Cd的含量超过广东省赤红壤的背景值,重金属在土壤中呈现明显的富集特征.土壤中Cu,Zn和Cd以残渣态所占比例最高,Pb以铁锰氧化物结合态最高.随着土壤中Cu,Zn,Pb和Cd含量的增加其残渣态所占比例降低,铁锰氧化物结合态或交换态所占比例增加,重金属活性增大.土壤中Cd迁移能力最强,迁移能力依次为Cd>Zn>Pb和Cu.Soil samples with O--20cm depth for urban green space were collected city, and the concentration, chemical fractionation and mobility of Cu, Zn, Pb and Cd in soils were studied. The results indicated that the concentrations of Cu, Zn, Pb and Cd were 6.4--188.2 （26.3）mg·kg^-1, 15.2--245.5 （ 47.2 ） mg·kg^-1 and 0. 01---3.48 （0.47） mg·kg^-1 respec- 34. 9--284.8 （69. 1 ）mg ·kg^-1, tively. The mean concentrations of Cu, Zn and Pb in soils for road green belt, and Cd for park green space were the highest. 75.6%, 87.0%, 98.8% and 98.8% of studied soils for Cu, Zn, Pb and Cd concentrations were higher than background values in Latosolic red earth of Guangdong province respectively, which reflected significant enrichment of heavy metals in soils. The Cu, Zn and Cd in soils were predominately located in residual fraction, Pb in Fe-Mn oxide fraction. With the increase of soil Cu, Zn, Pb and Cd concentrations, the precentage of their residual fraction decreased, Fe-Mn oxide or exchangeable fraction increased, and their activities increased. Cadmium was identified as the most mobile element, and the order of mobility was Cd 〉 Zn 〉 Pb, Cu.

关 键 词：重金属 化学形态 土壤 深圳市 

分 类 号：X53[环境科学与工程—环境工程] TU985.127[建筑科学—城市规划与设计]