Groundwater Pollution Characteristics and Source Apportionment

Huan, Huan; Xu, Jianwei; Wang, Jinsheng; Xi, Beidou

doi:10.1007/978-981-10-7706-7_4

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“…In contrast, biomass burning, which is extremely rare at most times of the year, nonetheless plays more important roles in particle concentrations and pollution events in the PRD in harvest season (Zhang et al 2010;Tao et al 2014;Wang et al 2016;Liu et al 2018;Zhou et al 2018). Influenced by multiple atmospheric conditions such as relative humidity and temperature, secondary processes, mainly generating sulfates, nitrates, and secondary organic aerosols, also substantially contribute to ambient aerosol concentrations (Hua et al 2015;. However, because of the complicated precursors, diverse reaction pathways, and high dependence on atmospheric conditions such as relative humidity and temperature, detailed knowledge about secondary aerosol formation is still not adequate (Ding et al 2012;Li et al 2017c).…”

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confidence: 99%

The regional nature of nitrate-dominant haze pollution during autumn over the Pearl River Delta area

Guo

Zhou

Huang

et al. 2020

Atmospheric and Oceanic Science Letters

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China has experienced severe haze and visibility degradation problems in recent years because of rapid urbanization and industrialization. In this study, daily atmospheric fine-aerosol samples were concurrently collected at three sites over the Pearl River Delta (PRD) region during 1-29 October 2014. PM 2.5 samples were analyzed for organic carbon and elemental carbon using a thermal/ optical carbon analyzer. Major water-soluble inorganic ions including F − , Cl − , NO 3 − , SO 4 2− , Na + , NH 4 + , K + , Mg 2+ , and Ca 2+ were analyzed by ion chromatography. The results show that the temporal variations of PM 2.5 concentration at the three sites were highly parallel, with particle pollution events simultaneously observed during 13-19 October (EP1) and 23-27 October (EP2), suggesting that pollution events in the PRD region are usually regional. This can most likely be attributed to the significant influences of synoptic conditions, which regionally facilitate or block diffusion of air pollutants. The chemical compositions of PM 2.5 at the three sites were also found to be similar, dominated by organics and sulfates. The results indicate that accumulation of traffic emissions seems to play important roles in particle pollution for the PRD region, leading in this case to elevated nitrate contributions during both EP1 and EP2 at the three sites. Moreover, the authors found that locally emitted aerosols from biomass burning only markedly influenced the air condition at one site, Nanhai, during EP1, while regionally transported biomass burning aerosols from eastern and northern Guangdong Province influenced all three sampling sites when the PRD was dominated by polluted air from these directions during EP2. 珠三角秋季硝酸盐气溶胶致霾污染的区域性特征摘要为研究珠三角地区大气霾污染特征和形成机制, 于2014年秋季在区域内三个典型观测站同步开

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