模拟酸雨对泉州市大气降尘重金属浸出特性的研究  

The Study of Simulated Acid Rain on Leaching Characteristics of Heavy Metals from Quanzhou Dustfall

作　　者：戚红璐[1] 胡恭任[1] 李祯[1] 

机构地区：[1]华侨大学环境科学与工程系,福建厦门361021

出　　处：《工业安全与环保》2010年第5期21-23,共3页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金项目(40673061)资助

摘　　要：针对福建泉州地区受污染的大气降尘样品,采用模拟酸雨浸泡的试验方法,研究不同酸度模拟酸雨(pH分别为2.5,3.5,4.5和5.6)对大气降尘样品中重金属元素浸出性质的影响。研究结果表明,Cu、Pb、Ni、Zn、Mn、Cr、V、Co、Cd均有不同程度的浸出,随着模拟酸雨pH值的升高重金属浸出率逐渐减小,pH在2.5到3.5范围内浸出率变化最大,Cd、Cu、Pb、Zn、Cr的释放量明显高于其他元素。pH是影响9种重金属元素浸出率大小的主要影响因素,降尘样品本身的酸碱度对其浸出率也有一定的影响。通过实验也让人们了解了大气降尘中重金属的潜在危害。The dusffall leaching model is used to study the leaching process of heavy metals with the simulated acid rain. The dusffall sampies polluted by heavy metals are obtained from Quanzhon, Fujian Province. The pH of the simulated acid rain is controlled in four levels of 2.5, 3.5, 4.5 and 5.6. The tested metals includes Cu, Pb, Ni, Zn, Mn, Ca, V, Co and CA. The investigation reveals that CO, Pb, Ni, Zn, Mn, Cr, V, Co and CA has varying degrees of dissolution and with the increase of pH value of the simulated acid rain, the leaching rate of heavy metals gradually decreases. At pH range of 2.5 to 3.5, the change of leaching rate is the largest. The release of CA, CO, Pb, Zn and Cr is significantly higher than that of other elements. From this experiment we can see the impact of pH is the main dement for leaching process. The pH values of samples also have an appreciable effect. This experiment also allows people to understand the potential hazards of heavy metals in the dust of the atmosphere.

关 键 词：模拟酸雨 大气降尘 重金属 浸出率 

分 类 号：X513[环境科学与工程—环境工程]