某电解铅厂周边农田土壤和玉米中铅污染评价及同位素溯源研究

为探究铅在土壤-玉米-大气中的迁移转化行为,以某电解铅厂周边农田土壤和玉米为研究对象,采集距排烟口50 m、110 m、300 m、500 m、700 m、900 m和3 000 m处的土壤和玉米样品,利用原子吸收光谱仪(AAS)和电感耦合等离子体质谱仪(ICP-MS)分别测定土壤、玉米和大气样品的铅含量和同位素比值。结果表明:电解铅厂周边的玉米均受到铅的污染,玉米根中的铅主要来自土壤,籽粒中的铅很有可能大部分来自大气,少部分来自土壤,茎中的铅很可能来自土壤而不是叶面传输;籽粒中的铅与叶片中的铅具有显著的相关关系(P0.01),相关方程为y=-0.0002x~2+0.0461x-0.4643,R=0.966 7。

Research on Pollution Assessment and Pollution Source of Lead Isotope in Farmland Soil and Maize around an Electrolytic Lead Factory

In order to explore the migration and transformation behavior of lead in soil-maize-atmosphere, the soil and maize in the farmland around an electrolytic lead plant were taken as research objects, and soil and maize samples at 50 m, 110 m, 300 m, 500 m, 700 m, 900 m and 3 000 m from the exhaust vents were collected. The lead content and isotope ratio of soil, maize and atmospheric samples were measured by atomic absorption spectrometry (AAS) and inductively coupled plasma mass spectrometry (ICP-MS), respectively. The results show that the maize around the electrolytic lead plant is polluted by the lead plant, and the lead in the roots of maize mainly comes from the soil. It is very likely that the lead in the grain mostly comes from the atmosphere, and a small part comes from the soil. The lead in the stems probably comes from the soil rather than leaf transport. There is a significant correlation between the lead in the grains and the lead in the leaves (P<0.01).The correlation equation is y=-0.0002x²+0.0461x-0.4643, R=0.966 7.