摘要
收集整理了中国 33 个城市的表层土壤重金属(As、Co、Cr、Cu、Mn、Ni、Pb、Zn、Cd、Hg)含量,城镇化指标(GDP、常住人口、机动车保有量),大气环境监测指标(空气质量指数 AQI、PM2.5、PM10、SO2、NO2、CO 和 O3),研究了 33 个城市土壤重金属污染空间分布特征和潜在风险.结果表明:各个城市土壤重金属 As、Co、Cr、Cu、Mn、Ni、Pb、Zn、Cd、Hg的平均含量分别是中国土壤元素背景值的 1.12、1.75、1.21、1.69、1.16、1.13、1.75、1.66、4.18、2.87 倍.土壤重金属地累积指数(Igeo)均值排序为 Cd(1.48)＞Hg(0.93)＞Pb(0.23)＞Co(0.22)＞Cu(0.17)＞Zn(0.14)＞Cr(-0.31)＞Mn(-0.37)＞Ni(-0.41)＞As(-0.42).中国八大社会经济区域内梅罗污染指数顺序为西南地区(7.07)＞长江中游地区(6.84)＞北部沿海地区(6.81)＞东部沿海地区(4.09)＞南部沿海地区(3.82)＞东北地区(3.12)＞黄河中游地区(2.76)＞大西北地区(3.73).不同重金属元素单项潜在生态风险系数大小顺序为 Cd＞Hg＞As＞Pb＞Co＞Cu＞Ni＞Cr＞Mn＞Zn,潜在生态风险指数平均值为 665.15.城市土壤中 Cu、Mn、Pb和 Zn之间相关性较好,但是与城镇化指标、大气环境监测指标之间不存在显著相关性.
Abstract
The content of heavy metals(As,Co,Cr,Cu,Mn,Ni,Pb,Zn,Cd,Hg)in topsoil,urbanization index(GDP,resident population,vehicle ownership)and atmospheric environment monitoring index(AQI,PM2.5,PM10,SO2,NO2,CO and O3)in 33 cities of China were collected and sorted out,and the spatial distribution characteristics and potential risks of soil heavy metal pollution in provincial capital cities were studied in this paper.The results showed that the average content of heavy metals As,Co,Cr,Cu,Mn,Ni,Pb,Zn,Cd and Hg in the soils of provincial capital cities were 1.12,1.75,1.21,1.69,1.16,1.13,1.75,1.66,4.18 and 2.87 times of the background values of Chinese soil elements,respectively.The order of Igeo mean value of soil heavy metal cumulative pollution index was:Cd(1.48)＞Hg(0.93)＞Pb(0.23)＞Co(0.22)＞Cu(0.17)＞Zn(0.14)＞Cr(-0.31)＞Mn(-0.37)＞Ni(-0.41)＞As(-0.42).The nemero pollution index values in the 8 socio-economic regions of China were:Southwest China(7.07)＞Middle reaches of the Yangtze River(6.84)＞Northern coastal area(6.81)＞Eastern coastal area(4.09)＞Southern coastal area(3.82)＞Northeast China(3.12)＞Middle reaches of the Yellow River(2.76)＞Great Northwest China(3.73).The order of potential ecological risk coefficient of different heavy metals was Cd＞Hg＞As＞Pb＞Co＞Cu＞Ni＞Cr＞Mn＞Zn,and the average value of potential ecological risk index was 665.15 respectively.The correlation among Cu,Mn,Pb and Zn in urban soil was good,but there was no significant correlation with urbanization index and atmospheric environment monitoring index.
维普
万方数据