大学校园室内BTEX的浓度水平、来源及健康风险

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

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.

The concentrations, source analysis and carcinogenic risks of BTEX in different indoor environments of a university campus such as classrooms, libraries, canteens and dormitories were investigated. The mean concentration of BTEX was （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 BTEX concentrations occurred in the order： dormitories 〉 canteens 〉 classrooms 〉 libraries. Dormitories were chosen for factor analysis, the results of which indicated that 71.61% of BTEX came 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.