冶炼厂周边区域夏季大气Cu和Cd沉降特征

为了解贵溪冶炼厂周边农田区域夏季大气重金属沉降状况,于2012年6—8月及2013年6—8月(夏季),设置8个监测点,共收集大气干湿混合样品48个,采用原子吸收分光光度法分析了Cu、Cd。结果发现,冶炼厂周边区域2012年夏季Cu、Cd沉降通量分别为42.5~421、1.01~5.06 mg/m2,平均值149、2.02 mg/m2;2013年夏季Cu、Cd沉降通量分别为40.6~94.3、0.12~0.44 mg/m2,平均值59.4、0.26 mg/m2。同1月份不同监测点Cu、Cd沉降量存在一定差异性,风向为造成该差异性的主要气象因素;不同监测点Cu、Cd月沉降通量与风向频率均具有显著相关性(r均大于0.60)。降雨量影响Cu、Cd月沉降量,Cu、Cd平均月沉降量与降雨量均呈显著相关关系(r=0.91、r=0.87,P0.05)。

Study on Atmospheric Deposition Characteristics of Cu and Cd in Summer around One Smelting Factory

We chosed eight monitoring points at different positions around Guixi smelting factory to find out the level of atmospheric deposition fluxes of Cu and Cd in summer. The samples were collected in each summer of 2012 and 2013(June, July, August). All samples were calculated the deposition fluxes and analysed the deposition characteristics. The results showed that, Cu and Cd deposition fluxes varied in range of 42.5-421, 1.01-5.06 mg/m² respectively in the summer of 2012, the average value is 149, 2.02 mg/m², and the deposition fluxes of Cu and Cd varied in range of 40.6-94.3, 0.12-0.44 mg/m² respectively in the summer of 2013, the average value is 59.4, 0.26 mg/m². A certain differences exist in Cu and Cd deposition fluxes among eight monitoring points, which is mainly caused by wind directions. The Cu and Cd deposition fluxes in each month both have significant correlation with wind direction frequencies(r>0.60). And rainfalls had influenced the deposition fluxes of Cu and Cd apparently, of which correlation coefficient are 0.91, 0.87 respectively.