沈阳市城区土壤和灰尘中铅的分布特征

 对沈阳市城市土壤和灰尘中铅的分布特征进行了研究.结果表明,沈阳市区土壤中全铅含量为26～2910.60mg/kg,平均为199.72mg/kg,是对照(33.30mg/kg)的6倍,是沈阳市土壤背景值(22.15mg/kg)的9倍;沈阳市区灰尘中铅浓度范围为19.58～2809.90mg/kg,平均为220.06mg/kg,是对照(37.97mg/kg)的5.8倍;沈阳市土壤和灰尘中铅分布空间差异大,局部污染比较严重,灰尘中铅与土壤中铅的分布规律趋于一致,铁西区铅浓度最高,其次是和平区、皇姑区和于洪区的交界处以及大东工业区;土壤和灰尘中铅含量与距污染源的距离成反比,与距地表的距离也成反比.

The distribution character of lead in soil and dust in urban region of Shenyang City

The distribution character of lead in soil and dust in urban region of Shenyang City is studied preliminarily. The total lead content in the soil is 26~2910.60mg/kg, with average value of 199.72mg/kg, which is six times of the content in control point and nine times of the background value in Shenyang City. The range of total lead content in the dust is 19.58~2809.90mg/kg, with average value of 220.06mg/kg, which is 5.8 times of the content in control point. The difference of the distribution of lead in soil and dust is obvious; the partial pollution is serious, the lead distribution rule in soil and dust tends to be identical, lead content in Tiexi district is highest, next is the content in Heping district, the joint of Yuhong and Huanggu districts and Dadong industrial district. The lead content in soil and dust decreases with increasing of the distance to the pollution source and also to the earths surface.