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\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 别 名: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 多环芳烃(PAH)；稠环芳烃 \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 分子式: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> C\u003Csub>20\u003C\u002Fsub>H\u003Csub>12\u003C\u002Fsub> \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 分子量: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 252 \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 熔 点: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 217℃ 沸点：480℃ \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 密 度: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 比重1.32 \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 蒸汽压: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 20℃(蒸汽压 1.32×10-13kPa ) \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 溶解性: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 不溶于水 \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 稳定性: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 外观与性状: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 晶体 \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 危险标记: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>\u003Cstrong> 用 途: \u003C\u002Fstrong>\u003C\u002Ftd>\n\u003Ctd> 本品在工业上无生产和使用价值，一般只作为生产过程中形成的副产物随废气排放 \u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003C\u002Ftbody>\n\u003C\u002Ftable>\n\u003Cbr \u002F>\n\u003Cb> 2.对环境的影响: \u003C\u002Fb>\n\u003Cbr \u002F>毒性毒理：人们对环境中多环芳烃的毒性的全面研究还比较少。在环境中很少遇到单一的多环芳烃(PAH)，而PAH混合物中可能发生很多相互作用。PAH化合物中有不少是致癌物质，但并非直接致癌物，必须经细胞微粒中的混合功能氧化酶激活后才具有致癌性。第一步为氧化和羟化作用，产生的环氧化物或酚类可能再以解毒反应生成葡萄糖苷、硫酸盐或谷胱甘肽结合物，但某些环氧化物可能代谢成二氢二醇，它依次通过结合而生成可溶性的解毒产物或氧化成二醇-环氧化物，这后一类化合物被认为是引起癌症的终致癌物。PAH的化学结构与致癌活性有关，分子结构的改变，常引起致癌活性显著变化。在苯环骈合类的多环芳烃中有致癌活性的只是4至6环的环芳烃中的一部分。苯并[k]荧蒽的相对致癌性较弱。 \n\u003Cbr \u002F>\n\u003Cbr \u002F>代谢、降解、蓄积：PAH具有高度的脂溶性，易于经哺乳动物的内脏和肺吸收，能迅速地从血液和肝脏中被清除，并广泛分布于各种组织中，特别倾向于分布在体脂中。虽然PAG有高度的脂溶性，但是在动物或人的脂肪中几乎无生物蓄积作用的倾向，主要因为PAH能迅速和广泛地被代谢，代谢产物主要以水溶性化合物从尿和粪中排泄。在环境大气和水体中的PAH受到足够能量的阳光中紫外线的照射时会发生光解作用，土壤中的某些微生物可以使PAH降解，但分子量较大的苯并[k]荧蒽的光解、水解和生物降解是很微弱的。 \n\u003Cbr \u002F>\n\u003Cbr \u002F>迁移、转化：环境中的PAH主要来源于煤和石油的燃烧，也可来自垃圾焚烧或森林大火。其生成量同燃烧设备和燃烧温度等因素有关，如大型锅炉生成量很低，家用煤炉生成量很高。柴油和汽油机的排气中，以及炼油厂、煤焦油加工厂和沥青加工厂等排出的废气和废水中都含有PAH。PAH还存在于熏制的食物和香烟烟雾中。PAH大多吸附在大气和水中的微小颗粒物上，大气中的PAH为通过沉降和降水而污染土壤和地面水，研究表明，除了工业排污外，大气降水是径流排水中PAH的主要来源。由于PAH的水中溶解度低和亲脂性较强，因此该类化合物易于从不中分配到沉积物、有机质及生物体内，其结果使水中PAH的浓度较低，而在沉积物中残留浓度较高。 \n\u003Cbr \u002F>\n\u003Cbr \u002F>\n\n\u003Cb>3.现场应急监测方法: \u003C\u002Fb>\n\u003Cbr \u002F>　 \n\u003Cbr \u002F>\n\u003Cbr \u002F>\n\n\u003Cb>4.实验室监测方法: \u003C\u002Fb>\n\u003Cbr \u002F>高效液相色谱法(GB13198-91，水质) \n\u003Cbr \u002F>气相色谱法《空气中有害物质的测定方法》(第二版)，杭士平编 \n\u003Cbr \u002F>气相色谱法《固体废弃物试验分析评价手册》中国环境监测总站等译 \n\u003Cbr \u002F>\n\u003Cbr \u002F>\n\n\u003Cb>5.环境标准: \u003C\u002Fb>\n\u003Cbr \u002F>欧洲共同体(1975)饮用水 0.0001mg\u002FL(PAH) \n\u003Cbr \u002F>\n\u003Cbr \u002F>\n\n\u003Cb>6.应急处理处置方法: \u003C\u002Fb>\n\u003Cbr \u002F>处置：由于PAH与悬浮固体紧密结合，所以可以通过采用水处理措施降低浊度来保证PAH含量降至最低水平。 \n\u003Cbr \u002F>\n\u003Cbr \u002F>预防措施：由于PAH污染人类环境的范围很广，产生污染的具体原因很多，所以预防措施涉及的工艺操作过程，废水废气的综合利用和处理，自来水的净化和消毒，改进汽油燃烧过程，改良食品烟熏剂，提供间接烘烤，养成个人卫生习惯(不吸烟或少吸烟)等。 \n\u003Cbr \u002F>\u003Cbr \u002F>\u003Cbr \u002F>\u003Cbr \u002F>\u003Cbr \u002F>\n\u003Cbr 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