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污染控制技术及原理

Concentration,source analysis and risk assessment of BTEX in the indoor air of a university campus

基金项目：国家自然科学基金重大国际合作研究项目(No.20621140003);国家高技术研究发展计划(863)项目(No.2007AA061403);国家自然科学基金项目(No.20677048)

摘要：采用热解析气相色谱法采集分析空气中痕量BTEX,研究了新建大学校园内教室、图书馆、食堂等公共场所及学生宿舍空气中BTEX的浓度水平、来源及健康风险.结果表明,室内BTEX的平均浓度为(46.56±4.60)μg·m^-3,其中甲苯和苯含量较高,分别为(21.23±2.13)和(8.95±6.45)μg·m^-3.不同场所BTEX浓度大小为学生宿舍>食堂>教室>图书馆.其中学生宿舍空气中71.61%的BTEX来自室内源,27.29%来自室外源.苯暴露对学生的致癌风险为9.24×10^-6,超过了美国EPA制定的人体致癌风险限值.

Abstract：The concentrations,source analysis and carcinogenic risks of BTEXin different indoor environments of a university campus such as classrooms,libraries,canteens and dormitories were investigated.The mean concentration of BTEXwas(46.56±4.60) μg·m^-3,of which toluene and benzene were the most abundant compounds with concentrations of(21.23±2.13) and(8.95±6.45) μg·m^-3,respectively.The BTEXconcentrations occurred in the order: dormitories > canteens > classrooms > libraries.Dormitories were chosen for factor analysis,the results of which indicated that 71.61% of BTEXcame from indoor sources,while 27.29% came from outdoor sources.The carcinogenic risk of benzene was evaluated to be 9.24×10^-6 and was much higher than the limit set by USEPA.