山西煤层自燃区PM_(10)中有机碳、元素碳的特征

采集了山西大同市、宁武县和河曲县煤层自燃区12个点位PM10样品,采用Analysensysteme Gmb H Vario E1型元素分析仪分析了PM10中有机碳(OC)和元素碳(EC)组分,探讨了煤层自燃区OC、EC污染特征、总碳气溶胶(TCA)对PM10的贡献、OC/EC比值.结果表明,PM10、OC、EC的质量浓度范围分别为114~401,22.9~68.1,21.9~70.7μg/m3.不同区域PM10、OC和EC污染水平差异较大,河曲县PM10污染最为严重,宁武县碳污染水平最高.露头煤层自燃区PM10低于采空自燃区,而对于OC和EC则相反.TCA对PM10的贡献高达63.82%,且露头煤层自燃区TCA对PM10的贡献比采空自燃区高.不同采样点OC/EC值介于0.7~1.6之间,小于前人结论中相似源OC/EC值.二次有机碳(SOC)污染较小.

Characterization of atmospheric organic and elemental carbon of PM10in coal spontaneous combustion zone,Shanxi

Twelve PM10 samples were collected at coal spontaneous combustion zone in Datong, Ningwu and Hequ, Shanxi, and were analyzed for organic carbon (OC) and elemental carbon (EC) by Analysensysteme GmbH vario E1cube. Total carbon aerosol (TCA) contribution to PM10 and OC/EC ratio were discussed. The ranges of PM10, OC, EC concentration were114~401, 22.9~68.1, 21.9~70.7μg/m3, respectively. There were significant differences of pollution levels of PM10, OC and EC in different regions. The most serious PM10 pollution was at Hequ, while the highest level of carbonaceous particulate matter was at Ningwu. Average PM10 concentrations in outcrop coal spontaneous combustion zone was lower than in mined coal spontaneous combustion zone, however, the distribution of OC and EC was opposite. Total carbonaceous aerosol (TCA=OC×1.6+EC) accounted for 63.82% of the PM10 mass. TCA contribution to PM10 in outcrop coal spontaneous combustion zone was higher than in mined coal spontaneous combustion zone. OC/EC ranged from 0.7to 1.6, less than the ratio in other researchers￠studies, indicating secondary organic carbon (SOC) pollution was lighter.