摘要
为了弄清洪湖市大气降水p H值及重金属干湿沉降状况,于2014年3月—2015年3月分春夏秋冬四季在6个采样点系统收集了大气降水样品24件。研究结果表明:洪湖市大气降水年平均p H值为6.76,总体上为中性雨,并未受到酸雨威胁;大气降水中重金属质量浓度较低,Zn、Cr、Pb、Cd、Hg、Cu及As平均值分别为13.31、0.24、0.68、0.13、0.02、1.13、0.77μg/L;总体而言,除As外,各重金属元素季度干沉降通量密度在春季明显高于其它各季;经估算,Cu、Cr、Hg、Cd、Pb、Zn及As湿沉降通量分别为15.97、0.29、0.82、0.16、0.02、1.36、0.92 mg/(m^2·a),最后根据《土地质量地球化学评估技术要求》大气质量等级标准,表明研究区大气质量总体优良,为一级水平。
In order to find out the p H value of atmospheric precipitation and the wet deposition of heavy metals in Honghu City, 24 samples were collected at 6 representative sites from March 2014 to March 2015, which covered four seasons of spring, summer, autumn and winter. The study showed that the average p H value of the atmospheric precipitation in Honghu City was 6.76 and it was generally neutral rain, which was not been threatened by acid rain.The average concentrations of heavy metals in the atmospheric precipitation were low. The average values of Zn, Cr, Pb,Cd, Hg, Cu and As were 13.31、0.24、0.68、0.13、0.02、1.13 and 0.77 μg/L, respectively. In general, the dry deposition density of the heavy metal elements except for As was significantly higher in spring than in other seasons. After estimation, the wet deposition of Cu, Cr, Hg, Cd, Pb, Zn and As was 15.97, 0.29, 0.82, 0.16, 0.02, 1.36 and 0.92 mg/（m^2·a）,respectively. According to the air quality grade standards in the Land Quality Geochemical Assessment Technical Requirments, the overall quality of the air was generally good and was at the first class standard.
出处
《城市环境与城市生态》
CAS
2016年第1期18-20,27,共4页
Urban Environment & Urban Ecology
基金
湖北省"金土地"工程--高标准基本农田地球化学调查项目(洪土资发[2014]13号)
关键词
大气干湿沉降
PH
重金属
洪湖市
dry and wet atmospheric deposition
pH
heavy metal
Honghu City
