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众所周知,砷并非是金属元素,但因砷对环境所产生的影响和危害与重金属有相似之处,故在环境污染的研究与防治中,通常把它当作重金属看待。砷作为人体不需要的元素,毒性非常强,其化合物中的三氧化二砷是妇幼皆知的剧毒药物——砒霜。科学研究表明,只要有0.06克～0.20克砒霜进入人体,人就会中毒身亡。在地壳中,砷的丰度仅约为1.8 ppm,岩石和土壤中砷的含量在1 ppm 至数百ppm 之间。地面水中的含砷量因水源和地理条件不同而有很大差异(据H.J.M.鲍恩估算,淡水为O.2微克/升～230微克/升,平均为0.5微克/升;海水为3.7
As we all know, arsenic is not a metal element, but due to the similarities and effects of arsenic on the environment and hazards associated with heavy metals, it is often treated as a heavy metal in the research and prevention of environmental pollution. Arsenic, as an unwanted element of the human body, is very toxic. The arsenic trioxide in its compound is a highly toxic drug known to both women and children - arsenic. Scientific research shows that as long as there are 0.06g ~ 0.20g arsenic into the human body, people will be poisoned to death. In the earth’s crust, the abundance of arsenic is only about 1.8 ppm, and the content of arsenic in rocks and soils is between 1 ppm and several hundred ppm. The arsenic content in surface water varies greatly depending on the source and geographical conditions (according to H.J.M. Bowen estimates, freshwater is O.2 μg/L to 230 μg/L, with an average of 0.5 μg/L; sea water is 3.7