应用ICP-MS检测不同种植制度土壤中重金属含量

Application of ICP-MS to Detection of Heavy Metals in Soil from Different Cropping Systems

随着社会的发展,人们越来越关心人类活动对环境和食品污染造成的影响。以北京市大兴区不同种植制度的土壤作为实验材料,借助于ICP-MS对土壤中重金属进行了测定,以确定人类活动对土壤生态环境的影响。结果显示,长期种植水果的土壤中和长期小麦玉米轮作的土壤中重金属含量显著高于种植蔬菜的土壤:Cr,Mn,Ni,Cu,Zn,As和Cd以长期种植水果的土壤中含量最高;Ti和Pb以长期小麦玉米轮作的土壤中含量最高,它们甚至高出其他土壤几倍。分析原因除了与人们施用的化肥、灌溉用水有关以外,还与种植果树等作物收获部分较少有关,而种植蔬菜大部分器官都收获,带走了许多重金属。

With the rapid development of the society, more and more attention has been paid to the influence of human activity on environment and food pollution. Soils of different cropping systems, sampled from Daxing district of Beijing, were analyzed in terms of the contents of heavy metals （Ti, Cr, Mn, Ni, Cu, Zn, As, Cd and Pb） by the method of ICP-MS to determine the influence of cropping system on environment. The results showed that the contents of nine heavy metals in soils from the cropping systems （fruits and maize/wheat） were several times higher than those from vegetable system. Contents of Cr, Mn, Ni, Cu, Zn, As and Cd were the highest in soils from fruit system, while Ti and Pb the highest in soils from maize/wheat system. The causes of the above differences could be the different harvest organs for different crops.