随着经济的发展，人类活动将各种重金属污染物带入环境中，造成这些污染物在环境中累积，并通过大气、水体、土壤进入食物链，进而直接或间接地威胁人类健康。汞对生物体来说是一种高毒元素，常温下以液态形式存在，具有较高的蒸气压，因而易于挥发进入大气。汞在大气中主要以气态单质汞(Hg0)形态存在，占大气总汞的90%以上，在大气中的驻留时间最长可达l年，并且能够通过大气循环进行远距离迁移，从而造成全球环境的汞污染。大气汞也可以通过干湿沉降返回地表，并能在水陆生态系统中进行甲基化和生物富集，进而对人类健康产生更大的危害。因此，研究大气汞状况，对了解区域汞污染现状，探索汞的生物地球化学循环规律，探寻汞污染的战略防...Along with the development of the economics, a large number of heavy metal contaminants, including organic and inorganic matters, were discharged into the urban environment by human activities, which has provoked some serious environmental problems. A threat to human health caused by these pollutants when they accumulate in the environment through air, water and soil and finally enter into the foo...学位：理学硕士院系专业：海洋与环境学院环境科学与工程系_环境管理学号：2262006115238
