Cyclic siloxanes in indoor environments from hair salons in Hanoi, Vietnam: Emission sources, spatial distribution, and implications for human exposure

Chemosphere ◽  
2018 ◽  
Vol 212 ◽  
pp. 330-336 ◽  
Author(s):  
Tri Manh Tran ◽  
Minh Binh Tu ◽  
Nam Duc Vu
Keyword(s):  
Spatial Distribution ◽  
Human Exposure ◽  
Emission Sources ◽  
Indoor Environments ◽  
Cyclic Siloxanes

A review of contamination status, emission sources, and human exposure to volatile methyl siloxanes (VMSs) in indoor environments

2019 ◽  
Vol 691 ◽  
pp. 584-594 ◽  
Author(s):  
Tri Manh Tran ◽  
Anh Quoc Hoang ◽  
Son Thanh Le ◽  
Tu Binh Minh ◽  
Kurunthachalam Kannan
Keyword(s):  
Human Exposure ◽  
Emission Sources ◽  
Indoor Environments

scholarly journals Investigations of temporal and spatial distribution of precursors SO<sub>2</sub> and NO<sub>2</sub> vertical columns in the North China Plain using mobile DOAS

2018 ◽  
Vol 18 (3) ◽  
pp. 1535-1554 ◽  
Author(s):  
Fengcheng Wu ◽  
Pinhua Xie ◽  
Ang Li ◽  
Fusheng Mou ◽  
Hao Chen ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Air Quality ◽  
North China Plain ◽  
North China ◽  
Emission Sources ◽  
Temporal And Spatial Distribution ◽  
Air Mass ◽  
The North ◽  
The North China Plain ◽  
Temporal And Spatial

Abstract. Recently, Chinese cities have suffered severe events of haze air pollution, particularly in the North China Plain (NCP). Investigating the temporal and spatial distribution of pollutants, emissions, and pollution transport is necessary to better understand the effect of various sources on air quality. We report on mobile differential optical absorption spectroscopy (mobile DOAS) observations of precursors SO2 and NO2 vertical columns in the NCP in the summer of 2013 (from 11 June to 7 July) in this study. The different temporal and spatial distributions of SO2 and NO2 vertical column density (VCD) over this area are characterized under various wind fields. The results show that transport from the southern NCP strongly affects air quality in Beijing, and the transport route, particularly SO2 transport on the route of Shijiazhuang–Baoding–Beijing, is identified. In addition, the major contributors to SO2 along the route of Shijiazhuang–Baoding–Beijing are elevated sources compared to low area sources for the route of Dezhou–Cangzhou–Tianjin–Beijing; this is found using the interrelated analysis between in situ and mobile DOAS observations during the measurement periods. Furthermore, the discussions on hot spots near the city of JiNan show that average observed width of polluted air mass is 11.83 and 17.23 km associated with air mass diffusion, which is approximately 60 km away from emission sources based on geometrical estimation. Finally, a reasonable agreement exists between the Ozone Monitoring Instrument (OMI) and mobile DOAS observations, with a correlation coefficient (R2) of 0.65 for NO2 VCDs. Both datasets also have a similar spatial pattern. The fitted slope of 0.55 is significantly less than unity, which can reflect the contamination of local sources, and OMI observations are needed to improve the sensitivities to the near-surface emission sources through improvements of the retrieval algorithm or the resolution of satellites.

Cyclic and linear siloxanes in indoor air from several northern cities in Vietnam: Levels, spatial distribution and human exposure

Chemosphere ◽  
2017 ◽  
Vol 184 ◽  
pp. 1117-1124 ◽  
Author(s):  
Tri Manh Tran ◽  
Hanh Thi Le ◽  
Nam Duc Vu ◽  
Giang Huong Minh Dang ◽  
Tu Binh Minh ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Indoor Air ◽  
Human Exposure ◽  
Northern Cities

scholarly journals Analysis of respirable and inhalable particle in Obaretin during dry season

2021 ◽  
Vol 12 (2) ◽  
pp. 67-73
Author(s):  
T.F. Ediagbonya ◽  
E.E. Ukpebor ◽  
F.E. Okieimen
Keyword(s):  
Spatial Distribution ◽  
Particulate Matter ◽  
Detection Limit ◽  
Trace Metals ◽  
Trace Metal ◽  
Atomic Absorption ◽  
Glass Fibre ◽  
High Volume ◽  
Emission Sources ◽  
Mean Concentration

Application of effective abatement plan to curtail particulate matter is only conceivable when the emission sources have been uniquely identified and characterized. SKC high volume gravimetric sampler Model 210-5000, serial no 20537 and respirable foam were used to capture the respirableparticle and the inhalable particle at five different locations in Obaretin between December 2008 to April 2009. The foam and the glass fibre filter were analyzed for trace metals (NI, Cr, Zn, Co, Fe, Mn, Cu, Pb and Cd) by using Atomic Absorption Spectrophotometric, (AAS). From the analysed trace metals Ni and Co were below detection limit and the trace metal Cd was moderately enriched. The total mean concentration values of the analyzed trace metals for inhalable particle (Fe: 1.70ssmg/m3 , Zn:0.0532mg/m3, Cu:0.1370mg/m3, Mn:0.034mg/m3, Cd:0.04452mg/m3, Pb: 0.15226mg/m3, Cr: 0.0070mg/m3). Trace metals in respirable particles, the total mean concentration values of the analysed trace metals are: (Fe: 1.4536mg/m3, Zn:0.0456mg/m3, Cu:0.1206mg/m3, Mn:0.1130mg/m3, Cd:0.2098mg/m3, Pb:0.13560mg/m3, Cr: 0.10000mg/m3) Ni and Co were below detection limit. The spatial distribution were insignificant (P>0.05). The values obtained in this study violated the available WHO limit and fell within the purview of OSHA limit.

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