scholarly journals Sources Profiles of Volatile Organic Compounds (VOCs) Measured in a Typical Industrial Process in Wuhan, Central China

Atmosphere ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 297 ◽  
Author(s):  
Longjiao Shen ◽  
Ping Xiang ◽  
Shengwen Liang ◽  
Wentai Chen ◽  
Ming Wang ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Printed Circuit Board ◽  
Industrial Process ◽  
Abundant Species ◽  
Central China ◽  
Circuit Board ◽  
Chemical Compositions ◽  
Offset Printing ◽  
Volatile Organic

Industrial emission is an important source of ambient volatile organic compounds (VOCs) in Wuhan City, Hubei Province, China. We collected 53 VOC samples from petrochemical, surface coating, electronic manufacturing, and gasoline evaporation using stainless canisters to develop localized source profiles. Concentrations of 86 VOC species, including hydrocarbons, halocarbons, and oxygenated VOCs, were quantified by a gas chromatography–flame ionization detection/mass spectrometry system. Alkanes were the major constituents observed in the source profile from the petrochemical industry. Aromatics (79.5~81.4%) were the largest group in auto-painting factories, while oxygenated VOCs (82.0%) and heavy alkanes (68.7%) were dominant in gravure printing and offset printing factories, respectively. Acetone was the largest contributor and the most frequently monitored species in printed circuit board (PCB) manufacturing, while VOC species emitted from integrated chip (IC) were characterized by high contents of isopropanol (56.4–98.3%) and acetone (30.8%). Chemical compositions from vapor of gasoline 92#, 93#, and 98# were almost identical. Alkanes were the dominant VOC group, with i-pentane being the most abundant species (31.4–37.7%), followed by n-butane and n-pentane. However, high loadings of heavier alkanes were observed in the profile of diesel evaporation.

scholarly journals Vehicular emission of volatile organic compounds (VOCs) from a tunnel study in Hong Kong

2009 ◽  
Vol 9 (19) ◽  
pp. 7491-7504 ◽  
Author(s):  
K. F. Ho ◽  
S. C. Lee ◽  
W. K. Ho ◽  
D. R. Blake ◽  
Y. Cheng ◽  
...  
Keyword(s):  
Hong Kong ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Abundant Species ◽  
Average Concentration ◽  
Ozone Formation ◽  
Liquefied Petroleum Gas ◽  
Key Species ◽  
Volatile Organic ◽  
Maximum Increment

Abstract. Vehicle emissions of volatile organic compounds (VOCs) were determined at the Shing Mun Tunnel, Hong Kong in summer and winter of 2003. One hundred and ten VOCs were quantified in this study. The average concentration of the total measured VOCs at the inlet and outlet of the tunnel were 81 250 pptv and 117 850 pptv, respectively. Among the 110 compounds, ethene, ethyne and toluene were the most abundant species in the tunnel. The total measured VOC emission factors ranged from 67 mg veh−1 km−1 to 148 mg veh−1 km−1, with an average of 115 mg veh−1 km−1. The five most abundant VOCs observed in the tunnel were, in decreasing order, ethene, toluene, n-butane, propane and i-pentane. These five most abundant species contributed over 38% of the total measured VOCs emitted. The high propane and n-butane emissions were found to be associated with liquefied petroleum gas (LPG)-fueled taxis. Fair correlations were observed between marker species (ethene, i-pentane, n-nonane, and benzene, toluene, ethylbenzene and xylenes – BTEX) with fractions of gasoline-fueled or diesel-fueled vehicles. Moreover, ethene, ethyne, and propene are the key species that were abundant in the tunnel but not in gasoline vapors or LPG. The ozone formation potential from the VOCs in Hong Kong was evaluated by the maximum increment reactivity (MIR). It was found to be 568 mg of ozone per vehicle per kilometer traveled. Among them, ethene, propene and toluene contribute most to the ozone-formation reactivity.

Volatile organic compound emission in a university printing press facility in eastern North Carolina

2020 ◽  
pp. 1420326X1989684
Author(s):  
Kellyn Reese ◽  
Ogaga Tebehaevu ◽  
Jo Anne G. Balanay
Keyword(s):  
North Carolina ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Weighted Average ◽  
Digital Printing ◽  
Offset Printing ◽  
Volatile Organic Compound Emission ◽  
Volatile Organic ◽  
The Mean ◽  
Eastern North Carolina

Printing presses are known to release volatile organic compounds (VOCs) that may pose health risks to workers. The purpose of this study was to assess the area airborne total volatile organic compounds (TVOCs) and toluene concentrations in an eastern North Carolina university printing facility. Real-time TVOC concentrations for ∼8 h were measured using photoionization detectors during each sampling day in the facility offset and digital printing areas. Air samples were collected in the offset printing area using activated charcoal tubes to determine the 8-h time-weighted-average toluene exposure. The mean daily TVOC concentrations (n = 38) had an overall average of 6.68 ± 3.25 ppm. The mean daily TVOC concentrations in the offset printing area (8.99 ± 2.93 ppm) were significantly higher ( p <0.01) than that in the digital printing area (4.38 ± 1.38 ppm), which may be attributed to the type of printing equipment used. The highest mean daily TVOC concentration (15.77 ± 5.69 ppm) and the maximum 1-s TVOC level (42.59 ppm) were measured in the offset printing area. The overall mean toluene concentration (n = 9) was 0.14 ± 0.10 ppm (range of 0.04–0.31 ppm). Findings of this study will help in further understanding the offset and digital printing TVOC exposures and in planning to improve worker protection in printing and other similar industries.

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