芜湖市区大气降尘中重金属铜、锌含量及其分布特征研究.docVIP

目 录 摘 要 ................................................ .........1 关键词 .................................................. ......1 Abstract ........................................................2 1引言……………………………………………………………………………….2 2研究方法 ....................................... ....... ...............2 2.1 采样点布置 .................. ...............................2 2.2 样品的采集..... ................................. ..... .......3 2.3 样品的处理与分析.............................................3 3 结果与讨论......................................................... ..4 3.1 芜湖市区大气降尘中重金属的分布特征……………………………………4 3.2不同功能区降尘中重金属含量………………………………………………6 3.3 降尘中重金属形态特征 ……………………………………………………7 3.4 降尘中重金属的生物有效性与环境风险……………………………………7 3.5大气降尘污染防治措施..........................................8 4 结论.......................................................... 9 参考文献 ..................................... ................. 9 致谢 ......................................... .................11 芜湖市区大气降尘中重金属铜、锌含量及其分布特征研究 摘 要:大气中粒径大于10μm的固体颗粒物的统称为降尘, 是大气污染的关键污染物之一。为了解其在芜湖市区域的铜和锌的沉降规律, 在芜湖市区域内布设20个采样点同步采集大气颗粒物干沉降。.以HNO3 -H2O2 为消解体系, 建立了微波消解-火焰原子吸收光谱法测定其中铜和锌元素的方法, 分析数据后可以看出芜湖市不同的功能区降尘重金属含量有所差异，降尘中金属Zn含量的平均值为56.27 mg/kg；降尘中金属Cu含量的平均值为93.02mg/kg，工业区和商业区含量明显高于居民区和乡村地区，Cu含量高于Zn含量。研究区降尘中重金属均存有明显的空间分布规律，Cu和Zn均是南北低而中部高。 关键词：:大气降尘；重金属；分布特征;火焰原子吸收法。 The research of Heavy metals copper and zinc content and its distribution characteristics in atmospheric dust in Wuhu city Abstract: Particle size is more than 10 microns solid particles in the atmosphere is collectively known as dust, which is one of the key pollutant of atmosphere pollution. To understand the subsidence regularity of copper and zinc in Wuhu area, setting 20 sampling site in Wuhu area. Synchronous sampling point sampling atmospheric particulates with HNO3 - H2O2 digestion system, established the microwave digestion - flame atomic absorption spectrometry with copper and zinc, the method of analysis data can be seen after Wuhu different functional areas