摘要
以南京北郊为例,测量分析了屋面径流中砷(As)、汞(Hg)、铅(Pb)、镉(Cd)和锌(Zn)5种元素的浓度、形态特征。结果表明:短时强降雨过程中这5种元素浓度在较大范围内无规则波动,且不同元素间浓度分布存在较大差异;Zn与Pb的平均浓度分别高于《地表水环境质量标准》(GB 3838—2002)的Ⅴ类和Ⅳ类标准限值,污染程度从大到小依次为Zn>Pb>As>Hg>Cd。元素形态分析表明,径流中除Hg外其他4种元素主要以颗粒态形式存在,各元素颗粒态占总形态的平均分数分别为:As,64.5%;Hg,43.7%;Pb,76.5%;Cd,54.6%;Zn,54.3%。
In this study,the pollution characteristics of arsenic （As）,mercury （Hg）,lead （Pb）,cadmium （Cd）and zinc （Zn）were determined for short-term roof runoff with condition of construction-fugitive-dust.Re-sults indicated that the concentration of elements varied to a high degree during the rainfall period,and it indica-ted big difference between different elements concentration.Based on both event mean concentrations and fluxes, it can be concluded that the elements pollution may be ranked as Zn 〉Pb 〉As 〉Hg 〉Cd.In terms of fractiona-tion,elements in the particulate phase dominated the runoff pollution;the mean fraction of elements in the partic-ulate phase to total phase was 64.5%,43.7%,76.5%,54.6% and 54.3%,respectively for As,Hg,Pb,Cd and Zn.
出处
《环境监测管理与技术》
CSCD
2015年第3期22-26,36,共6页
The Administration and Technique of Environmental Monitoring
基金
国家自然科学基金资助项目(41401546)
关键词
砷
汞
铅
镉
锌
污染特征
屋面径流
短时强降雨
南京
As
Hg
Pb
Cd
Zn
Pollution characteristics
Roof runoff
Short-term storm
Nanjing
