| PM10中重金属的分布及其在模拟酸雨中的释放 |
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| 中文关键词 可吸入颗粒物(PM10) 模拟酸雨 重金属释放 |
| 英文关键词 inhaled particles(PM10) simulated acid rain release of heavy metal |
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| 中文摘要 |
| 运用扫描电镜-X射线能谱分析方法（SEM-EDS）和电感耦合等离子体-原子发射光谱法（ICP-AES），分析和测定了佛山市可吸入颗粒物（PM10）及其中重金属的赋存状态和质量分布。同时研究了模拟酸雨淋溶条件下PM10中重金属Cu、Pb、Zn和Cd的释放过程。结果表明：颗粒物在大气中存在的形态各异，主要以簇状集合体形式存在。PM10日平均浓度为0.19mg/m3，与国家二级标准（0.15mg/m3）相比，超标率为79%。PM10中含有一定量的Zn、Pb、Cu和Cd，其中Zn、Pb的含量要高于Cd和Cu。模拟酸雨淋溶实验显示，PM10中Cu、Pb、Zn、Cd均有不同程度的释放，Cd和Zn的释放率明显高于Cu和Pb，且释放速率较快；pH值是影响四种重金属释放的主要因素，随模拟淋溶液pH值降低，重金属的释放强度显著提高。 |
| 英文摘要 |
| The distribution of heavy metals in inhaled particles matter (PM10), which were collected in Foshan during December of 2004, was characterized with Scanning Electron Microscope-X-ray Energy Dispersive Analysis technique (SEM-EDS) and Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES). The releases of Cu, Pb, Zn, and Cd were also examined for their potential releases in simulated acid rain, which were quantified with batch reactors. The results showed the daily average concentration of PM10 was 0.19mg/m3, about 79% higher than the secondary standard of China. The relatively contents of Zn and Pb in PM10 were much higher than Cd and Zn, whereas the releasing rates of Cd and Zn in simulated acid rain were greater than that of Cu and Pb. The releasing rates of heavy metals from PM10 were increased as the pH of the acid rain decreased. |
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