Characterization of summer PM2.5 aerosols from four forest areas in Sichuan, SW China

Mo, Hengqin; Li, Li; Wei, Lai; Zhao, Min; Pu, Jinguo; Zhou, Yi; Deng, Shihuai

doi:10.1016/j.partic.2014.10.009

Cited by 13 publications

(4 citation statements)

References 29 publications

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“…The eastern Sichuan basin, e.g. Deyang, Zigong and Yibin city has high residuals because of its unique geographical climate conditions35. Shenzhen city of southern Guangdong province also has much higher residuals because of the influence of coal used as fuel in this area for industrial plants2736.…”

Section: Resultsmentioning

confidence: 99%

Spatiotemporal Pattern of PM2.5 Concentrations in Mainland China and Analysis of Its Influencing Factors using Geographically Weighted Regression

Luo

Samat

et al. 2017

Sci Rep

130

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Based on annual average PM2.5 gridded dataset, this study first analyzed the spatiotemporal pattern of PM2.5 across Mainland China during 1998–2012. Then facilitated with meteorological site data, land cover data, population and Gross Domestic Product (GDP) data, etc., the contributions of latent geographic factors, including socioeconomic factors (e.g., road, agriculture, population, industry) and natural geographical factors (e.g., topography, climate, vegetation) to PM2.5 were explored through Geographically Weighted Regression (GWR) model. The results revealed that PM2.5 concentrations increased while the spatial pattern remained stable, and the proportion of areas with PM2.5 concentrations greater than 35 μg/m3 significantly increased from 23.08% to 29.89%. Moreover, road, agriculture, population and vegetation showed the most significant impacts on PM2.5. Additionally, the Moran’s I for the residuals of GWR was 0.025 (not significant at a 0.01 level), indicating that the GWR model was properly specified. The local coefficient estimates of GDP in some cities were negative, suggesting the existence of the inverted-U shaped Environmental Kuznets Curve (EKC) for PM2.5 in Mainland China. The effects of each latent factor on PM2.5 in various regions were different. Therefore, regional measures and strategies for controlling PM2.5 should be formulated in terms of the local impacts of specific factors.

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Section: Resultsmentioning

confidence: 99%

Spatiotemporal Pattern of PM2.5 Concentrations in Mainland China and Analysis of Its Influencing Factors using Geographically Weighted Regression

Luo

Samat

et al. 2017

Sci Rep

130

View full text Add to dashboard Cite

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“…3 ). Many studies have shown that rough surface plant structures can more effectively retain atmospheric particulate matter, including Hg (Mo et al 2015 ). More importantly, the middle of the maize whiskers is a hollow structure, with both regular catheters and irregular tissue gaps, and SEM measurements (Fig.…”

Section: Discussionmentioning

confidence: 99%

Retention properties and mechanism of agricultural waste maize whisker on atmospheric mercury

Zheng,

Chen,

Zhou

et al. 2023

Bioresour. Bioprocess.

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Mercury (Hg) is a global pollutant transmitted mainly through the atmosphere, posing a serious threat to biological survival and human health. Porous materials, with high specific surface area, high porosity, and high adsorption, are particularly suitable for the purification of atmospheric Hg mixtures. However, plant porous materials are rarely directly used for atmospheric Hg purification. In this study, the properties and mechanism of maize whisker in removing atmospheric Hg were analyzed. The results show that the Hg content in the whiskers increases significantly as the initial Hg concentration increases, and 79.38% Hg can be removed by 0.2 g maize whiskers after 1 h exposure when the initial Hg concentration is 0.1 μg m−3, indicating that maize whiskers can accumulate atmospheric Hg rapidly and effectively. The hole diameter of the maize whisker is between 0.83 and 3.06 μm, which is suitable for the adsorption of small substances. Correlation analysis shows that maize whiskers have a significant correlation between atmospheric Hg retention and its specific surface area, pore size, medium pore ratio, and micropore ratio, suggesting that the maize whisker hole feature has a significant influence on its ability to retain atmospheric Hg. Compared with the energy profiles before and after Hg treatment, the peak of Mg decreased after Hg adsorption. Fourier infrared spectrometer analysis suggests that functional groups such as -OH, -COOH, and -O- are involved in the adsorption process. The change in pH value shows an obvious effect on the overall change in zeta potential in the adsorption process. Therefore, a variety of mechanisms, including physical adsorption, electrostatic adsorption, complexation, chelation, and ion exchange, are involved in Hg retention with the maize whisker. This study reveals the important potential value of agricultural waste maize whiskers in the purification of atmospheric heavy metal Hg. Graphical Abstract

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“…Finally, the daytime suburban OC/EC ratio (RTD profile) was three times higher than the nighttime one (RTN profile), which could be related to a secondary organic contribution due to transport emissions, local photochemical oxidation processes in the atmosphere, or presence of mixed vehicle exhaust in the background (Li et al 2010, Mo et al 2015, Lai et al 2016). In addition, these ratios were 2-4 times higher than those for the urban construction profile, supporting the origin of these kind of emissions, anthropogenic for urban construction and naturaltransport for suburban profiles.…”

Section: Oc/ec Diagnostic Ratiosmentioning

confidence: 91%

Fine Particles Emission Source Profiles for a Semi-Arid Urban Center: Key Markers and Similarity Tests

Mancilla

Medina

González

et al. 2022

Rev. Int. Contam. Ambie.

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Source apportionment studies rely on source emission profiles, which in some instances are locally scarce or non-existent. Thus, estimations are done using profiles obtained from other geographical sites, which brings a certain degree of uncertainty in the outcomes of such studies. This work presents the results of near-field measurement of 12 types of fine particle emission sources to develop local-region source profiles in the Monterrey Metropolitan Area. The source profiles include a chemical characterization of trace elements and carbonaceous fraction. A statistical analysis based on the Pearson distance and similarity identity distance was conducted to ensure the uniqueness of each source profile. Overall, the most dominant species in the profiles were organic and elemental carbon, and elemental sulfur, whereas the least abundant were transition metals. The meat-cooking operations profiles exhibited the highest organic carbon to elemental carbon ratios, which were 7-40 times higher than those for biomass burning and vehicle exhausts profiles. The urban construction profile was dominated by crustal elements, while the suburban area profile exhibited an internal mixing with anthropogenic compounds. The source profiles in this study were distinguishable, as determined by preliminary tests for each pair of chemical source profiles. These profiles could be used to implement receptor models in urban sites with similar characteristics.

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Characterization of summer PM2.5 aerosols from four forest areas in Sichuan, SW China

Cited by 13 publications

References 29 publications

Spatiotemporal Pattern of PM2.5 Concentrations in Mainland China and Analysis of Its Influencing Factors using Geographically Weighted Regression

Spatiotemporal Pattern of PM2.5 Concentrations in Mainland China and Analysis of Its Influencing Factors using Geographically Weighted Regression

Retention properties and mechanism of agricultural waste maize whisker on atmospheric mercury

Fine Particles Emission Source Profiles for a Semi-Arid Urban Center: Key Markers and Similarity Tests

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