用VEF值评价地铁车站内挥发性有机物的污染水平

[目的 ]评价地铁车站内站台和站厅挥发性有机物 (VOCs)的污染水平 ,并判断来源。 [方法 ]用气相色谱质谱联用仪对地铁车站站台和站厅挥发性有机物浓度进行测定 ,并用挥发性有机物富集指数 (VEF)进行分析。 [结果 ]两车站站台和站厅监测点白天及夜晚的CO2 浓度差异存在显著性 (P <0 .0 1) ,监测点白天和夜晚的VOCs浓度差异无显著性 (P >0 .0 5 )。地铁车站内VOCs的主要来源来自其自身室内排放源 ,室外污染物浓度及通风状况等可能对室内VOCs有影响。 [结论 ]地铁车站内存在VOCs污染 ,用VEF评价地铁车站内VOCs污染状况 ,能较简便、准确地反映其污染物来源 ,并可比较不同车站之间VOCs的浓度水平

Evaluating the Levels of Volatile Organic Compounds at Subway Stations by Using VEF

Objective To evaluate the levels of volatile organic compounds at hall and platform at two subway stations,and point out the possible sources of pollution.[Methods] By using GC-MS,the concentrations of volatile organic compounds were determined. The results were analyzed by volatile organic compound enrichment factor(VEF).[Results] There exists significant difference between CO 2 concentrations of two subway stations at day and night(P<0.01).The difference of VOCs between day and night is not significant. The main sources of volatile organic compounds are from indoor contaminants. Outdoor pollutants,as well as ventilation,may affect somewhat the level of indoors' pollution. [Conclusion] The concentration of volatile organic compounds remains high at subway stations. The use of VEF can help to identify the source of volatile organic compounds.