CAJ | 학술논문

采用混合溶剂提取、N,O-双(三甲硅醚)-三氟乙酰胺(BSTFA)衍生化预处理和 GC/MS 分析技术,对四川攀枝花苏铁国家自然保护区PM2.5中的大气二次有机气溶胶进行了定量检测,探讨了研究区域内气溶胶中异戊二烯、α-/β-蒎烯光氧化产物、β-石竹酸及小分子羧酸和的浓度水平与变化规律,并讨论了有机物占有机碳(OC)的比值。结果表明,24 h PM2.5中,异戊二烯光氧化产物、α-/β-蒎烯光氧化产物和β-石竹酸的平均浓度分别为51.2、16.1和1.7 ng/m3；苹果酸和2-羟基戊二酸的平均浓度分别为12.4 ng/m3和4.9 ng/m3。OC和元素碳(EC)的平均浓度分别为20.3μg/m3和5.9μg/m3。异戊二烯氧化产物、α-/β-蒎烯氧化产物及β-石竹烯氧化产物对OC的贡献率分别为1.63%、0.34%和0.36%。
채용혼합용제제취、N,O-쌍(삼갑규미)-삼불을선알(BSTFA)연생화예처리화 GC/MS 분석기술,대사천반지화소철국가자연보호구PM2.5중적대기이차유궤기용효진행료정량검측,탐토료연구구역내기용효중이무이희、α-/β-파희광양화산물、β-석죽산급소분자최산화적농도수평여변화규률,병토론료유궤물점유궤탄(OC)적비치。결과표명,24 h PM2.5중,이무이희광양화산물、α-/β-파희광양화산물화β-석죽산적평균농도분별위51.2、16.1화1.7 ng/m3；평과산화2-간기무이산적평균농도분별위12.4 ng/m3화4.9 ng/m3。OC화원소탄(EC)적평균농도분별위20.3μg/m3화5.9μg/m3。이무이희양화산물、α-/β-파희양화산물급β-석죽희양화산물대OC적공헌솔분별위1.63%、0.34%화0.36%。
PM2.5 aerosol samples, collected during the summer of 2011 in Sichuan Panzhihua Cycad National Nature Reserve, were extracted with mixed solution, derivatized with N,O-bis-(trimethylsilyl) trifluoroacetamide (BSTFA) and analyzed by gas chromatography/mass spectrometry (GC/MS). The objectives of this study were to examine the time series of photooxidation products of isoprene, α-/β-pinene and β-caryophyllene and of some small molecular carboxylic acids, to determine their concentrations and estimate their contributions to aerosol organic carbon (OC). The results showed that average concentrations of total isoprene and α-/β-pinene oxidation products and β-caryophyllinic acid in 24 h PM2.5 aerosol samples were 51.2, 16.1 and 1.7 ng/m3, respectively. Average levels of malic acid and 2-hydroxyglutaric acid were 12.4 ng/m3 and 4.9 ng/m3, and the mean concentrations of OC and elemental carbon (EC) were 20.3 μg/m3 and 5.9 μg/m3, respectively. Contributions of isoprene, α-/β-pinene and β-caryophyllene oxidation products to OC were 1.63%, 0.34% and 0.36% during sampling campaign, respectively.