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首页 > 新闻中心 > 杭州新婚夫妇新房对于多环芳烃除异味的方法
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杭州新婚夫妇新房对于多环芳烃除异味的方法
发布时间：2017-03-10        浏览次数：12        返回列表

多环芳烃(PAHs),是指两个以上苯环以稠环形式相连的化合物,是环境中存在很广的一类有机污染物,它是石油、煤等化石燃料及木材、烟草等有机物在不完全燃烧过程中产生的.火山爆发等也会产生PAHs.由于PAHs的致癌和(或)诱变性,对人类危害较大,所以,环境中PAHs的存在、迁移转化及其对人体健康的影响一直受到人们的重视,并成为比较热门的研究领域.

　　对PAHs的研究可追溯到18世纪.早在1775年,Pott认为阴囊癌的发生与职业暴露煤烟有关.杭州空气净化当然,那时并不知道其中的致癌物质是什么.过了150多年,到20世纪30年代,Cook等才最后确认煤烟中的致癌物质是PAHs,特别是苯并[a]芘(B[a]P).

　　人类活动(如汽车、烹调、采暖、吸烟等)排放的PAHs可直接进入大气,并吸附在颗粒物,特别是直径小于5(n的可吸人粒子上(PAHs的粒径分布随季节而变);由于35环的PAHs具有较高的蒸气压,即使在常温下也有相当部分以气态形式存在,即空气中PAHs以气、固两种状态存在,但一定条件下两者之间可以相互转化.影响空气中PAHs存在状态的因素有,PAHs本身的物理性质、气温以及其他共存的污染物如祺尘、03等.空气中的PAHs可以和03、NOx,HN03等反应,转化成致癌或诱变作用更强的化合物.

　　由于PAHs的生物效应,生活或工作空间存在PAHs显然是389危险的,它将直接影响人体健康.因此,PAHs分析在空气污染监测和控制中都是十分重要的.因空气中PAHs含量很低,成分复杂,稳定性差,故人们一直在致力于PAHs采样分析技术的研究,以准确监测空气中PAHs的浓度及存在状态.早期人们主要研究吸附在颗粒物上的PAHs及其粒径分布、来源,由于气相中PAHs同样具有危害性,故逐渐开展气相PAHs的研究,进而较全面监测评价城市空气颗粒物及气相中PAHs的含量和来源,研究室内空气中PAHs的污染状况、来源、水体接触PAHs的程度、指标及影响因素.在深入研究PAHs致癌、诱变作用的同时,近几年又开展了空气中PAHs的健康风险评价,试图确定空气中PAHs的安全浓度.由于N02-PAHs等比母体具有更强的致癌或诱变作用,因此空气中NCVPAHs等的来源及PAHs的反应也逐渐受到人们的重视.