上海市中心城区主干道道路扬尘组分特征及来源解析

Study on the chemical compositions characteristics and source apportionment in road dust of main roads in Shanghai central district

分析了上海市中心城区主干道道路扬尘的化学组分,并采用化学质量平衡模型进行了道路扬尘的源解析。结果表明,上海市中心城区主干道道路扬尘的主要化学组分为Si(18.285 0%(质量分数,下同))、Ca(5.772 2%)、Al(2.460 6%)、Fe(2.345 8%)、Mg(0.889 3%)、K(0.846 4%)、Na(0.785 6%)等地壳元素;源解析结果表明,道路扬尘的首要污染来源是建筑尘(贡献率为34.4%),其次是土壤风沙尘(贡献率为32.6%)、渣土尘(贡献率为20.8%)、机动车尾气尘(贡献率为0.8%)。土壤风沙尘、建筑尘和渣土尘是道路扬尘主要的供应者(贡献率合计超过80%)。

The chemical compositions characteristics in road dust of main roads in Shanghai central district were analyzed.And the sources of road dust were also analyzed by using chemical mass balance（CMB）receptor model.The results showed that the primary compositions in road dust were Si,Ca,Al,Fe,Mg,K,Na,with mass fractions of18.285 0%,5.772 2%,2.460 6%,2.345 8%,0.889 3%,0.846 4%,0.785 6%.The main source in road dust was building dust,followed by soil dust,muck dust and dust of motor vehicle exhaust,with contribution rate of 34.4%,32.6%,20.8%,0.8%.The main suppliers were building dust,soil dust and muck dust.Their total contribution rates were over 80%.