Identification of organosiloxanes in ambient fine particulate matters using an untargeted strategy via gas chromatography and time-of-flight mass spectrometry
Identification of organosiloxanes in ambient fine particulate matters using an untargeted strategy via gas chromatography and time-of-flight mass spectrometry
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通过气相色谱法和飞行时间质谱法使用非目标策略识别环境细颗粒物中的有机硅氧烷
DOI：
10.1016/j.envpol.2020.116128
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发表时间：
2021
影响因子：
8.9
通讯作者：
Zhu Tong
中科院分区：
文献类型：
--
作者：
Cheng Zhen;Qiu Xinghua;Shi Xiaodi;Zhu Tong
有机硅广泛应用于消费品，广泛存在于生活环境中。然而，关于周围颗粒物中这组污染物的系统信息很少。本研究提出了一种新的基于三种硅同位素质量差异的非靶向性策略，利用气相色谱和高分辨率飞行时间质谱仪从北京两年的PM2.5样品中筛选有机硅化合物。从1019个峰中筛选出61个有机硅化合物，鉴定出35个有机硅氧烷，其中甲基硅氧烷17个，苯基甲基硅氧烷18个，分别有6个和3个物种得到确证。这些有机硅氧烷可分为三类：低硅数甲基硅氧烷、高硅数甲基硅氧烷和苯甲基硅氧烷。低硅甲基硅氧烷在采暖季节丰度较高，而在非采暖季节丰度较低，而高硅数甲基硅氧烷则表现出相反的季节变化。这项研究为通过非靶向方法筛选有机硅化合物提供了一种有前景的策略，并为进一步调查有机硅氧烷的来源和健康风险提供了见解。
Organosilicons are widely used in consumer products and are ubiquitous in living environments. However, there is little systemic information on this group of pollutants in ambient particles. This study proposes a novel untargeted strategy based mainly on the mass difference of three silicon isotopes to screen organosilicon compounds from 2-year PM2.5samples of Beijing using gas chromatography and high-resolution time-of-flight mass spectrometry. 61 organosilicons were filtered from 1019 peaks, and 35 ones were identified as organosiloxanes including 17 methylsiloxanes and 18 phenylmethylsiloxanes, of which 6 and 3 species were confirmed using reference standards, respectively. These organosiloxanes could be clustered into three groups: low-silicon-number methylsiloxanes, high-silicon-number methylsiloxanes, and phenylmethylsiloxanes. Low-silicon-number methylsiloxanes showed high abundance in the heating season but low abundance in the non-heating season, whereas high-silicon-number methylsiloxanes showed the opposite seasonal variation. This study provides a promising strategy for screening organosilicon compounds through an untargeted approach and gives insights for further investigation of the sources and health risks of organosiloxanes.