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二噁英的汙染路徑

发布日期：2023-02-16 13:57:05 作者：揚塵檢測儀來源：揚塵監測系統浏覽量：1462

你以爲二噁英只是一種物質？錯！其實它是擁有著210個成員的大家族。

二噁英的汙染路徑

大約有95%的二噁英是通過垃圾焚燒産生的，其他的來源有汽車尾氣、造紙、殺蟲劑、化工、冶煉、森林大火等。通過這麽多的途徑，二噁英飄散在空氣中，溶進水裏，滲透進土壤中。除此以外，被汙染的水源、空氣、土壤等又會進入農作物、動物體內。了解過食物鏈的人都知道，站的位置越高，有害物質積累就越嚴重。很不幸，人類站在食品鏈的頂端。

二噁英具有強烈的毒性，不僅被國際癌症中心認定爲“一級致癌物”，還被世人稱爲“世紀之毒”。

它到底有多毒？

二噁英中最毒的2,3,7,8-TCDD的毒性是砒霜的900倍，是“入口即死”的氰化鉀的1000倍！堪稱地球上毒性最強的毒物！

這家夥廣泛存在于外界環境中，可以在環境中不斷遷移，從大氣到土壤、水體，再到農作物、禽畜，通過食物鏈層層蓄積，最後人類“照單全收”！

二噁英在人體內的半衰期長達7-11年，也就是說，7-11年後，人體內二噁英的濃度才降低到原來的一半。

這裏說一個舉世震驚的例子。

美國與越南戰爭的時候，由于越南的遊擊隊利用茂密的森林植被做掩護，很難辦，美軍就利用直升機在空中噴灑大量的“橙劑”。這是落葉劑，所到之處，茂密的叢林就變成了光禿禿的樹幹子。戰爭結束後，戰後軍人、當地居民的後代不是患癌症，就是出現先天性疾病或缺陷。後來人們經過調查，才知道“橙劑”含有劇毒物二噁英。

越南在2000年做過一次調查，約有60萬越南人接觸了橙劑中的二噁英殘留物而患病，後代不是夭折就是畸形兒，或者有神經系統的缺陷。

圖片來自：pixabay

二噁英的汙染路徑

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