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《Urban Environment & Urban Ecology》 2011-04
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Content of Heavy Metals of Road Greenbelt Soil in Nanjing City and Pollution Evaluation

DING Ai-fang1,LIU Cun-li1,CHEN Chang-yun1,ZHANG Yan-fang1,SHAO Jin-song2 (1.School of Biochemical and Environmental Engineering of Nanjing Xiaozhuang University,Nanjing 211171,China; 2.Jiangsu Agro-product Quality Test Center,Nanjing 210036,China)  
In order to study the accumulation characteristic of heavy metals in road greenbelt soil in different green time,soil samples with 0~5 cm and 5~20 cm depth of road greenbelt were collected at the centre of Nanjing City.After microwave digestion of soil,the total heavy metals,such as Cu,Zn,Pb,Cd and Cr were determined by atomic absorption spectrophotometer.The results showed that the average contents of total Cu,Zn,Pb,Cd and Cr of the soils were 38.8±14.3,113.4±25.5,53.1±27.7,0.114±0.06,51.8±8.9 mg/kg respectively.The maximum value was 2.4~18.5 times of the minimum value.Coefficient of variation of Zn and Cr was about 20%,other heavy metals were between 35%~55%.The contents of heavy metal were significantly higher in soil of green time before 2000 than that of after 2000.Pb,Cu and Zn were in different pollution level.Pb and Cu were in the moderate pollution level evenly.While Cr was limited to the level of alert,and Cd was in the cleanliness level.There existed surface accumulation of heavy metals in road greenbelt soil because of traffic and human activity.
【Fund】: 江苏省高校自然科学研究项目(JHZD09-17);; 南京市园林局项目(200901)
【CateGory Index】: X53
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