Mobile measurements of atmospheric decamethylcyclopentasiloxane (D5) in Eastern China

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2024-12-19 DOI:10.1016/j.atmosenv.2024.121001

Haifeng Yu , Yunhua Chang , Lin Cheng , Wen Tan , Liang Zhu , Jianlin Hu

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引用次数: 0

Abstract

Decamethylcyclopentasiloxane (D5) is prevalent in European and North American urban air due to the use of personal care products. China accounts for 55% of global siloxane production, yet the atmospheric concentration and sources of D5 in China remain largely unexplored. Using the Vocus mobile laboratory, here we performed high time-resolved measurements of D5 along a north-south transect (∼700 km) in eastern China. Prior to reaching the destination, Nanjing Chemical Industry Park (NCIP), D5 concentration had a low variability of minute-mean concentration (2.6 ± 1.3 pptv). Population density didn't exhibit a correlation with D5 concentration (1-min average concentration) (R² = 0.06), whereas a significant correlation was observed between the city-scale population and D5 concentration (R² = 0.74). Concentrated spikes in D5 concentrations (peaking at 384.8 pptv per second) were observed around NCIP, home to nearly 400 energy and chemical companies. These D5 concentrations were highly correlated with agrochemical-related dichlorobenzenes (R² = 0.99) rather than other petrochemical-related tracers. Unlike developed countries, D5 in China's air may primarily originate from emissions released during production processes.

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由于使用个人护理产品，欧洲和北美城市空气中普遍存在十甲基环五硅氧烷（D5）。中国的硅氧烷产量占全球产量的 55%，但中国大气中 D5 的浓度和来源在很大程度上仍未得到探索。利用 Vocus 移动实验室，我们在中国东部沿南北横断面（700 公里）对 D5 进行了高时间分辨测量。在到达目的地南京化学工业园区（NCIP）之前，D5 浓度的分钟平均值变化较小（2.6 ± 1.3 pptv）。人口密度与 D5 浓度（1 分钟平均浓度）不相关（R2 = 0.06），而城市人口与 D5 浓度之间存在显著相关性（R2 = 0.74）。在近 400 家能源和化工企业所在地--NCIP 附近，观测到 D5 浓度的集中峰值（峰值为每秒 384.8 pptv）。这些 D5 浓度与农用化学品相关的二氯苯（R2 = 0.99）而非其他石化相关示踪剂高度相关。与发达国家不同，中国空气中的 D5 可能主要来自生产过程中的排放。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.