兰州市大气降雪中重金属污染的研究及来源分析

摘要

Five samples of snow with urban and suburban were collected in 2015 from January to February typical snowfall month in Lanzhou city. And the snow was measured in the dissolved state by flame atomic absorption spectrophotometry (FAAS) (AA1700),including,10 heavy metals (Cu,Hg,Cd,Mn,Al,Pb,Zn,Fe,As,Cr). The characteristics of the heavy metal content of atmosphere snowfall sample in Lanzhou city and suburban were described. And the origin and changes of heavy metals were analyzed. The results showed that the snowfall in Lanzhou city atmospheric heavy metal content were significantly higher than that of the suburb,and Pb content was the largest. Mn content in urban was up the most than that of rural ar-eas,which was higher by 86.22%.%于2015年典型降雪月份1~2月采集了兰州市市区和郊区5场降雪样品,用火焰原子吸收分光光度法(福立AA1700)测定了雪水中溶解态的10种重金属元素(Cu、Hg、Cd、Mn、Al、Pb、Zn、Fe、As、Cr),研究了兰州市市区和郊区大气降雪样品的重金属含量特征,并分析了重金属的来源及变化规律.结果表明,兰州市市区大气降雪中重金属含量均明显高于郊区,且Pb元素含量最大,Mn元素市区比郊区高出最多,达86.22%.