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1.加拿大城市自来水中石棉含量调查加拿大的安大略省环境部于1972年8月～11月,对该省所属的地面水(河和湖)为水源的22个城市的自来水,调查了其中的石棉含量,所得结果摘要如表1。 2.美国水中石棉含量的调查据近年美国调查的结果,大多数主要水源包括湖、河和地下水中都含有一些石棉纤维,水中石棉的来源可能由下列几方面:水冲刷或流过含有石棉的土壤或岩石,刮风将
1. Survey of asbestos content in tap water in Canadian cities Canada’s Ontario Ministry of Environment surveyed the asbestos content in tap water from 22 cities where the surface water (river and lake) belongs to the province from August to November 1972. The results are summarized in Table 1. 2. Survey of Asbestos Content in the United States According to the results of recent US surveys, most of the major sources of water, including lakes, rivers, and groundwater contain asbestos fibers. The sources of asbestos in water may include the following: water erosion or flow through soil containing asbestos. Or rock, windy