摘要
对南京市3种不同类型屋面的雨水径流中Cu、Zn、Pb、Cd4种重金属进行14场次降雨事件的现场取样监测,分析了重金属污染的出流规律,并用统计分析方法对屋面径流重金属含量及其影响因素进行了探讨.结果表明,屋面径流4种重金属事件平均浓度(EMC值)具有较好的正态分布性,Cu、Zn、Pb、Cd的EMC中值浓度分别为19.4μg·L-1、131.0μg·L-1、19.9μg·L-1和0.31μg·L-1;屋面径流重金属污染受前期晴天数的影响最大;屋面径流重金属浓度在一定程度上受到雨前大气污染状况的影响,4种重金属与PM10的相关性大小顺序为:Cd>Pb>Zn>Cu.
Four heavy metals-Cu,Zn,Pb and Cd-contained in the runoff of 3 different types of roofs in Nanjing were monitored through field sampling during 14 rainfall events.During the process,the discharge patterns of heavy metal pollution were analyzed and the concentration of heavy metals in the roof runoff and the factors influencing the runoff were explored with statistical methods.The results showed that the EMCs of the four heavy metals in the roof runoff had a normal distribution;the average event mean concentrations （EMCs） of Cu,Zn,Pb and Cd were 19.4 μg·L-1,131.0 μg·L-1,19.9 μg·L-1 and 0.31 μg·L-1 respectively.The heavy metal pollution in the roof runoff was mostly influenced by the number of sunny days antecedent to the rainfall event;the concentration of heavy metals in the roof runoff was influenced to a certain extent by the status of air pollution before the rainfall event;the correlation between these four heavy metals and PM10 in order of importance was CdPbZnCu.
出处
《环境科学学报》
CAS
CSCD
北大核心
2011年第4期724-730,共7页
Acta Scientiae Circumstantiae
基金
"十一五"国家科技支撑计划重大项目(No.2006BAJ03A04)~~
关键词
屋面雨水径流
重金属
事件平均浓度
影响因素
roof runoff
metals
event mean concentration （EMCs）
influence factors
