【摘要】 将人类的活动看成是对有毒有害元素的生产过程,应用均值-极差控制图对成都市城区内大气降尘中的汞元素(Hg)含量的分布特点进行了分析,得到异常值出现的原因,并提出纠正和预防措施。结果表明,成都市城区内汞元素的产生过程是基本稳定的,总体上处于统计控制状态。更多还原

【Abstract】 The distribution and quality control about Hg element in air dust near the ground of Chengdu were discussed with average-range(-R)control chart when regarding people’s activity as the process of producing poisonous and bad element.The result shows that the generation process of Hg element is under control and steady.更多还原