采集柳林县城扬尘及空气颗粒物其他污染源(煤烟尘、土壤风沙尘、建筑水泥尘、机动车尾气尘)样品,测定了元素、离子、碳化学组分,并与其他城市的扬尘化学组分进行比较.结果表明,柳林细粒子(PM2.5)扬尘和粗粒子(PM10)扬尘的化学组成为:常量元素(32.66％、43.65％) ＞TC(17.49％、15.13％)＞离子组分(4.68％、2.79％)＞微量元素(1.52％、1.43％).柳林粗粒子扬尘化学组成与其他城市相差较大:TC含量高于其他4个城市,SO42-、Ca、Fe含量总体较低.分歧系数计算结果为:细粒子CDm,,k=0.42,粗粒子CDmk=0.46,均大于0.2,说明扬尘与土壤风沙尘的化学组成相似程度不高,受人类活动的影响较大.总之,土壤风沙尘、建筑水泥尘、煤烟尘是影响柳林扬尘的主要因素,煤炭使用、煤炭运输和机动车尾气尘对柳林扬尘也有一定影响.
Re-suspended dust (RD) in atmospheric environment and particulate (PM2.5and PM10) associated with primary emission (such as coal dust,soil dust,cement dust,vehicle dust) sources in Liulin were collected.And the elements,ions and carbon species were analyzed in order to the establishment the chemical composition profile of RD.The contents of chemical components associated with fine particulate (PM2.5) and coarse particulate (PM1o) in Liulin were elements (32.66％,43.62％) ＞TC (17.49％,15.13％) ＞water-soluble ions (4.68％,2.79％) ＞trace elements (1.52％,1.43％);The chemical composition of RD in Liulin was significantly different from other cities.The proportion of TC in Liulin was higher than other cities,while the ones of SO42-,Ca and Fe of RD in Liulin were relative lower than other cities.The divergence coefficient was 0.42 for PM2.5 and 0.46 for PM10,and both were larger than 0.2,which indicated that there was difference in chemical component profiles between RD and soil dust.In brief,soil dust,cement dust and coal dust were the major influencing factors on chemical component of RD,and the use and transportation of coal and vehicle exhaust dust had some influence on RD.
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