从芳香挥发性化学产品中气相臭氧分解和二次羟基生成麝香化合物开士美兰。

IF 4.3 3区 环境科学与生态学 Q1 CHEMISTRY, ANALYTICAL
Ayomide A Akande, Nadine Borduas-Dedekind
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引用次数: 0

摘要

芳香个人护理产品是挥发性化学产品(VCPs)的一个子集,是能够影响空气质量的一种新的室外污染物来源。香水中使用的麝香等芳香分子已在水生生物、水体、室内空气和城市环境中被发现。考虑到麝香气味化合物的分布,有必要对其在室内外的大气归宿进行限制。在这里,我们使用 Vocus 质子转移反应飞行时间质谱仪量化了 Cashmeran(一种双环麝香化合物)在大气中的氧化归宿,Cashmeran 与 galaxolide、astratone 和 rosamusk 一起在一种商用香水中被检测到。开司梅兰的浓度最高可达 0.35 ppbv,占香水的 0.33 ± 0.04%。我们测定了 O3 与开士梅兰环加的二阶速率常数为 (2.78 ± 0.31) × 10-19 cm3 molec-1 s-1,在 N2 中的温度为 293 ± 1 K。这个速率常数对应于 20 ppbv O3 的 85 天寿命。然后,我们在含有 20%O2 的空气中重复了臭氧分解实验,测得的二次 OH 浓度高达 5.1 × 105 摩尔/立方厘米-3。因此,香味分子(如香茅)的氧化作用可通过产生二次羟基自由基来改变室内空气的氧化能力。此外,我们的研究结果表明,开士梅兰的寿命很长,可以作为城市空气中的 VCP 示踪剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The gas phase ozonolysis and secondary OH production of cashmeran, a musk compound from fragrant volatile chemical products.

Fragrant personal care products are a subset of volatile chemical products (VCPs), an emerging source of outdoor pollutants capable of impacting air quality. Fragrant molecules, such as musks, are used in perfumes and have been found in aquatic organisms, water bodies, indoor air, and urban environments. Considering the distribution of musk-smelling compounds, there is a need to constrain their atmospheric fate indoors and outdoors. Here, we used a Vocus proton-transfer-reaction time-of-flight mass spectrometer to quantify the atmospheric oxidative fate of cashmeran, a bicyclic musk compound, detected in a commercial perfume alongside galaxolide, astratone and rosamusk. Cashmeran concentrations rose up to 0.35 ppbv representing a mass yield of 0.33 ± 0.04% of the perfume. We determined the second order rate constant of the cyclo-addition of O3 with cashmeran to be (2.78 ± 0.31) × 10-19 cm3 molec-1 s-1 at 293 ± 1 K in N2. This rate constant corresponds to an 85 day lifetime against 20 ppbv of O3. Then, we repeated the ozonolysis experiments in air with 20% O2 and measured significant secondary OH concentrations up to 5.1 × 105 molec cm-3. Consequently, the lifetime of cashmeran in our experiment was shortened to 5 h. Thus, the oxidation of fragrant molecules, like cashmeran, could alter the oxidative capacity of indoor air via the production of secondary OH radicals. Furthermore, our results show that cashmeran is long-lived and could serve as a VCP tracer in urban air.

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来源期刊
Environmental Science: Processes & Impacts
Environmental Science: Processes & Impacts CHEMISTRY, ANALYTICAL-ENVIRONMENTAL SCIENCES
CiteScore
9.50
自引率
3.60%
发文量
202
审稿时长
1 months
期刊介绍: Environmental Science: Processes & Impacts publishes high quality papers in all areas of the environmental chemical sciences, including chemistry of the air, water, soil and sediment. We welcome studies on the environmental fate and effects of anthropogenic and naturally occurring contaminants, both chemical and microbiological, as well as related natural element cycling processes.
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