scholarly journals Mercury isotopic compositions in fine particles and offshore surface seawater in a coastal area of East China: implications for Hg sources and atmospheric transformations

2021 ◽  
Vol 21 (24) ◽  
pp. 18543-18555
Author(s):  
Lingling Xu ◽  
Jiayan Shi ◽  
Yuping Chen ◽  
Yanru Zhang ◽  
Mengrong Yang ◽  
...  
Keyword(s):  
Coastal Area ◽  
Fine Particles ◽  
Industrial Area ◽  
East China ◽  
Emission Sources ◽  
Spatial Difference ◽  
Surface Seawater ◽  
Atmospheric Processes ◽  
Isotopic Compositions ◽  
Source Materials

Abstract. Isotopic compositions of Mercury (Hg) in atmospheric particles (HgPM) are probably the mixed results of emission sources and atmospheric processes. Here, we present Hg isotopic compositions in daily fine particles (PM2.5) collected from an industrial site (Chunxiao – CX) and a nearby mountain site (Daimeishan – DMS) in a coastal area of East China, and in surface seawater close to the industrial area, to reveal the influence of anthropogenic emission sources and atmospheric transformations on Hg isotopes. The PM2.5 samples displayed a significant spatial difference in δ202Hg. For the CX site, the negative δ202Hg values are similar to those of source materials, and the HgPM contents were well correlated with chemical tracers, indicating the dominant contributions of local industrial activities to HgPM2.5, whereas the observed positive δ202Hg at the DMS site was likely associated with regional emissions and extended atmospheric processes during transport. The Δ199Hg values in PM2.5 from the CX and DMS sites were comparably positive. The unity slope of Δ199Hg versus Δ201Hg over all data suggests that the odd mass independent fractionation (MIF) of HgPM2.5 was primarily induced by the photoreduction of Hg2+ in aerosols. The positive Δ200Hg values with a minor spatial difference were probably associated with the photooxidation of Hg0, which is generally enhanced in the coastal environment. Total Hg in offshore surface seawater was characterized by negative δ202Hg and near-zero Δ199Hg and Δ200Hg values, which are indistinguishable from Hg isotopes of source materials. Overall, the PM2.5 collected from industrial areas had comparable δ202Hg values but more positive Δ199Hg and Δ200Hg as compared to surface seawater. The results indicate that atmospheric transformations would induce the significant fractionation of Hg isotopes and obscure the Hg isotopic signatures of anthropogenic emissions.

scholarly journals Mercury isotopic compositions in fine particles and offshore surface seawater in a coastal area of East China: Implication for Hg sources and atmospheric transformations

2021 ◽  
Author(s):  
Lingling Xu ◽  
Jiayan Shi ◽  
Yuping Chen ◽  
Yanru Zhang ◽  
Mengrong Yang ◽  
...  
Keyword(s):  
Coastal Area ◽  
Fine Particles ◽  
Industrial Area ◽  
East China ◽  
Emission Sources ◽  
Spatial Difference ◽  
Surface Seawater ◽  
Chemical Tracers ◽  
Isotopic Compositions ◽  
Source Materials

Abstract. Isotopic compositions of Hg in atmospheric particles (HgPM) are probably the mixed results of emission sources and atmospheric processes. Here, we present Hg isotopic compositions in daily fine particles (PM2.5) collected from an industrial site (CX) and a nearby mountain site (DMS) in a coastal area of East China, as well as in surface seawater close to the industrial area, to reveal the roles of anthropogenic emission sources and atmospheric transformations in varying Hg isotopes. The PM2.5 samples displayed significant spatial difference in δ202Hg. For the CX, the negative δ202Hg values were similar to those of source materials and HgPM contents were well correlated with other chemical tracers, indicating the dominant contributions of local industrial activities to HgPM2.5. Whereas the observed positive δ202Hg at the DMS was likely associated with regional emissions and extended photo-reduction during transport. Δ199Hg values in PM2.5 from the CX and DMS were comparable positive. The unity slope of Δ199Hg versus Δ201Hg over all data suggests that the odd-MIF of HgPM2.5 was primarily induced by photo-reduction in aerosols. The positive Δ200Hg values with minor spatial difference were probably associated with photo-oxidation of Hg0 which is generally enhanced in the coastal environment. Total Hg in offshore surface seawater was characterized by negative δ202Hg and near-zero Δ199Hg and Δ200Hg, which are indistinguishable from Hg isotopes of source materials. Overall, industrial PM2.5 had comparable δ202Hg values but more positive Δ199Hg and Δ200Hg as compared to surface seawater. The results indicate that atmospheric transformations would induce significant fractionation of Hg isotopes, which obscures Hg isotopes of anthropogenic emissions.

Atmospheric Deposition of Solid Particles in the Area of Košice

2015 ◽  
Vol 244 ◽  
pp. 188-196
Author(s):  
Jozef Hančuľák ◽  
Tomáš Kurbel ◽  
Erika Fedorová ◽  
Jaroslav Briančin ◽  
Oľga Šestinová ◽  
...  
Keyword(s):  
Atmospheric Deposition ◽  
Fine Particles ◽  
Industrial Area ◽  
Solid Particles ◽  
Emission Sources ◽  
Iron And Steel ◽  
Edx Analysis ◽  
Fe Oxides ◽  
Iron And Steel Works ◽  
Steel Works

The total atmospheric deposition (AD) was sampled in the urban and industrial area with iron and steel works and other urban sources of pollution. The eleven sampling sites have been placed on the roof above the height of the surrounding buildings at a distance of between 1 and 15 kilometers from the largest industrial source of air pollution in Slovakia. Qualitative and quantitative characteristics of the AD of solid particles (PM) and the fluxes AD of elements (Fe, Al, Mn, Zn, Pb, Cu, Cr, Cd, As) were studied. Particle size distribution, SEM and EDX analysis were applied for PM characterization. Relatively high occurrence of fine particles under 10 µm (12.1 - 47.7%) were found in the samples. SEM and EDX analysis showed the presence of particles whose origin is mainly from emission sources of ironworks (Fe oxides, Fe-rich particles, Ca-rich particles, Mn-Fe oxides). The extremely high values of AD of Fe (18,551 and 27,232 µg.m-2.day-1) and Mn (695 and 1295 µg.m-2.day-1) were measured at two sites near (1.3 and 4.5 km) the iron and steel works compared to the AD of the other areas. The portion of emission sources iron and steel works on the AD of Fe and PM fluxes at the individual sites in the city was calculated in the range of 21.8 to 51.4%. The results from 2009–2014 are introduced.

Seasonal variations in pCO2 and its controlling factors in surface seawater of the northern East China Sea

2007 ◽  
Vol 27 (20) ◽  
pp. 2623-2636 ◽  
Author(s):  
JeongHee Shim ◽  
Dongseon Kim ◽  
Young Chul Kang ◽  
Jae Hak Lee ◽  
Sung-Tae Jang ◽  
...  
Keyword(s):  
East China Sea ◽  
Seasonal Variations ◽  
Controlling Factors ◽  
East China ◽  
Surface Seawater ◽  
China Sea

Distribution, sources and ecological risk of polycyclic aromatic hydrocarbons in the estuarine–coastal sediments in the East China Sea

2017 ◽  
Vol 19 (4) ◽  
pp. 561-569 ◽  
Author(s):  
Ye Li ◽  
Xinran Liu ◽  
Min Liu ◽  
Xiaofei Li ◽  
Qing Wang ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
East China Sea ◽  
Ecological Risk ◽  
Aromatic Hydrocarbons ◽  
Coastal Area ◽  
Coastal Sediments ◽  
East China ◽  
The East China Sea ◽  
Polycyclic Aromatic ◽  
Estuarine Coastal

Pollution by PAHs in the estuarine–coastal area of the ECS should be paid attention.

scholarly journals Summertime and wintertime atmospheric processes of secondary aerosol in Beijing

2019 ◽  
Author(s):  
Jing Duan ◽  
Ru-Jin Huang ◽  
Yongjie Li ◽  
Qi Chen ◽  
Yan Zheng ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Seasonal Variations ◽  
Chemical Speciation ◽  
Fine Particles ◽  
Large Fraction ◽  
Formation Mechanisms ◽  
Urban Air ◽  
Aerosol Formation ◽  
Secondary Aerosol ◽  
Atmospheric Processes

Abstract. Secondary aerosol constitutes a large fraction of fine particles in urban air of China. However, its formation mechanisms and atmospheric processes remain largely uncertain despite considerable studies in recent years. To elucidate the seasonal variations of fine particles composition and secondary aerosol formation, an Aerodyne quadrupole aerosol chemical speciation monitor (Q-ACSM) combined with other online instruments were used to characterize the submicron particulate matter (diameter 

ELEMENTAL ANALYSIS OF ATMOSPHERIC AEROSOLS: RESULTS AND PERSPECTIVES OF THE PIXE TECHNIQUE

1990 ◽  
Vol 01 (02) ◽  
pp. 93-112 ◽  
Author(s):  
E. KOLTAY
Keyword(s):  
Elemental Analysis ◽  
Atmospheric Aerosols ◽  
Emission Sources ◽  
Emission Inventories ◽  
Aerosol Transport ◽  
Detailed Understanding ◽  
Main Research ◽  
Atmospheric Processes ◽  
Research Fields ◽  
Pixe Method

Information on the elemental constituents of atmospheric aerosols is of basic importance in studying atmospheric processes for a detailed understanding of the physics and chemistry of the atmosphere. Environmental pollution and its impact can be tested in the same way, too. In the present review we survey the main research fields in aerosol analytics that can be investigated with the application of the PIXE method. The nature of emission sources, emission inventories, aerosol transport and its tracing, arctic aerosols and climatic influences are mentioned along with methodological features of the present-day PIXE technique and its combined applications with other tools of instrumental analytics.

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