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中文摘要：
为了解兰州市大气可吸入颗粒物（PM10）及其中重金属Zn，Cu和Cd污染规律，对国家环境保护部发布的兰州市大气监测数据进行分析，并于2010年7月和2011年1月在兰州市设立6个采样点分别采集夏季和冬季大气可吸入颗粒物，测定其中Zn，Cu和Cd的质量浓度．结果表明：从2001年开始兰州市PM10质量浓度逐年下降，并且冬春两季下降程度高于夏秋两季．每年PM10质量浓度在5—10月较低，从11月开始快速升高，到次年第一季度达到最高，高质量浓度会一直持续到次年4月，5月再次降低．PM10质量浓度的日平均变化呈现明显双峰双谷分布，并且在空间上表现出工业区〉商业区〉清洁区的规律．PM10中的重金属Zn，Cu和Cd质量浓度大小依次为Zn〉Cu〉〉Cd，且3种元素质量浓度在冬季采暖期高于夏季非采暖期．
英文摘要：
In order to understand inhalable particle matters in ambient air and their characteristics of zinc, copper and cadmium in Lanzhou, an analysis was made of the air monitoring statistics of Lanzhou published by the Ministry of Environmental Protection of China. Six sampling points were set up in different functional areas of Lanzhou in July of 2010 and January of 2011 and the concentrations of zinc, copper and cadmium in ambient air were determined. The results show that PM10 concentrations in Lanzhou decreased year by year since 2001, especially in winter and spring. The data also demonstrate that the PM10 was lower from May to October but increased rapidly after November every year, and reached peak level in the first quarter of the next year. The high concentration would be sustained in April, and descend again in May. We observed that the PM10 presented an obvious daily distribution of two peaks and two valleys. And it presented a spatial distribution of industrial park〉 commercial district〉 clean zone. The concentrations of zinc, copper and cadmium elements in the PM10 indicate a zinc〉 copper 〉〉cadmium pattern. The concentrations of heavy metals in winter heating period were much higher than in summer.
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