义乌市TSP中3种重金属元素的沉降

Deposition of Three Heavy Metal Elements in TSP in Yiwu City

测定了义乌市TSP及其中的重金属Fe,Mn和Cu的浓度,通过扫描电镜和降雨冲洗效果分析了含有这3种重金属的颗粒物的粒径,计算了3种重金属的沉降通量。结果表明相对于世界其他城市,义乌市TSP中这3种重金属浓度偏高;绝大部分TSP的半径小于4.5μm;Fe和Mn的湿沉降量大于干沉降量,而Cu以干沉降为主。

The concentrations of the TSP and the three heavy metals Fe,Mn and Cu in TSP were detected in Yiwu city,and the distribution of the particle size were analyzed by scanning electron microscope and wash of the rain,then the depositions of the three heavy metals were analyzed.The results showed that compared with the other cities in the world,the concentrations of the three heavy metals in TSP in Yiwu city were a litter higher,and the radii of most of the particle were less than 4.5μm,the wet deposition of Fe and Mn was higher than the dry deposition.But for Cu,it was opposite.