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环境中铅的自然分布铅是地壳的组成成分之一,在地壳岩石圈中含铅约2～200毫克/公斤,并遍布于土壤、水、大气及食物中。在自然条件下,环境中铅量变动较大,未开垦的土地含铅约8～20毫克/公斤,已开垦的耕地含铅可高达300毫克/公斤。未污染的海水含铅约5×10~(-7)%(多在0.01毫克/升以下),河水约为0.005毫克/升。植物可以吸收土壤中溶解状态的铅,
Lead in the Environment Natural Distribution Lead is one of the components of the crust. Lead in the crustal lithosphere is about 2 to 200 mg / kg and is found in soils, water, air and food. Under natural conditions, the amount of lead in the environment varies greatly. The uncultivated land contains about 8-20 mg / kg of lead and the reclaimed cultivated land contains up to 300 mg / kg of lead. Uncontaminated seawater contains about 5 x 10 ~ (-7)% lead (mostly 0.01 mg / l or less) and the water is about 0.005 mg / l. Plants can absorb lead dissolved in the soil,