Ambient BTEX and MTBE in the neighborhoods of different industrial parks in Southern Taiwan

Hsieh, Lien‐Te; Yang, Hsi-Hsien; Chen, Ho‐Wen

doi:10.1016/j.jhazmat.2005.08.001

Cited by 68 publications

(38 citation statements)

References 32 publications

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“…Therefore, it is possible that such multiple industrial sources of VOCs can coexist and are spread into Zoying and Guogang tunnels by the air flow/wind as long as traffic fleets move in the tunnels. This observation agrees with the point of view of Hsieh et al (2006), who indicate that in neighborhoods where multiple sources of VOCs coexist, the concentration ratio of MTBE to any VOC tends to be smaller than when traffic is the main source, as the contribution of VOC from these multiple sources is superimposed upon the traffic emissions, whereas MTBE comes only from traffic.…”

Section: Mtbe-btex Ratios In Different Tunnelssupporting

confidence: 91%

“…For each collected sample, MTBE and BTEX (including benzene, toluene, ethylbenzene, m/p-xylene and o-xylene) were analyzed by gas chromatography with a flame ionization detector (GC/FID, Agilent Technologies, 6890N Network GC System) using the NIOSH Method 1615 (Hsieh et al, 2005;Hsieh et al, 2006). Identification and quantification of VOCs were accomplished by using a GC with a Agilent Technologies capillary column (DB-1 30 m × 0.53 mm i.d., 3.0m film thickness), a flame ionization detector (FID).…”

Section: Sampling and Instrumentsmentioning

confidence: 99%

“…Some investigated studies revealed that toluene/benzene (T/B) ratio increases with increasing traffic volume, (Lee et al, 2002;Hsieh et al, 2006). Therefore, T/B ratios in different tunnels were also calculated and examined in this study (as shown in Table 4).…”

Section: Toluene/benzene (T/b) Ratios In Different Tunnelsmentioning

confidence: 99%

“…Since the 1970s, MTBE has become a common ingredient in gasoline owing to its excellent octane rating and low impact on air quality in large cities. As far as chemical property is concerned, MTBE is more suitable than other volatile organic compounds as a reference compound for indicating traffic emissions, owing to the fact that it is a compound consumed in the formation of gasoline (Hsieh et al, 2006). Chang et al (2003) indicated that besides some minor leakage from gas stations during pumping, MTBE in ambient air is assumed to derive almost exclusively from car exhaust and evaporative emissions (Chang et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…In Taiwan, by applying the characteristic ratios, Hsieh et al (2005Hsieh et al ( , 2006 have been able to characterize the ambient BTEX and MTBE in some representative sites, including: (1) in the ambient air of night markets in southern Taiwan; (2) in the neighborhoods of different industrial parks in southern Taiwan. In Hanoi, Vietnam, Truc and Oanh (2007) investigated roadside BTEX and other gaseous air pollutants in relation to emission sources.…”

Section: Introductionmentioning

confidence: 99%

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Measurements and Correlations of MTBE and BETX in Traffic Tunnels

Hsieh

Wang

Yang

et al. 2011

Aerosol Air Qual. Res.

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In this study, the concentrations of five volatile organic compounds (VOCs), including BTEX and methyl tertiary-butyl ether (MTBE), were investigated in five different traffic tunnels (including Liangshan, Yueguangshan, Zoying, Guogang and Zhongliao tunnels) in southern Taiwan. Results showed that Guogang Tunnel was the most polluted with the highest average levels of both MTBE and BTEX while ethylbenzene had the lowest levels. The range of measured concentration of toluene in Liangshan, Yueguangshan, Zoying, Guogang and Zhongliao tunnels were from 5.6 to 6.2 (mean = 1.6), from 0.0 to 62.3 (mean = 17.6), from 2.7 to 26.7 (mean = 13.1), from 15.2 to 125.5 (mean = 57.5), and from 43.7 to 197.1 (mean = 115.8) μg/m 3 , respectively. In Guogang Tunnel, the average MTBE-BTEX ratios at two peak rush periods were (5.0:1, 5:3, 4:1, 0:1, 5:1.1) and (5.7:1, 3:3, 2:1, 0:1, 4:1.1). From morning till night, the ratios at different sampling periods in the five different tunnels suggest the existence of both different traffic flow and variations in traffic fleet type in different tunnels. T/B ratio ranged from 0 to 2.3, from 0 to 1.9, from 0.6 to 2.5, from 0.9 to 2.6 and from 0 to 10.5 in Liangshan, Yueguangshan, Zoying, Guogang and Zhongliao tunnels, respectively. We also observed a wide range of (m+p+o)-xylenes/ethylbenzene (ΣX/E) or m,p-X/E ratio in all five tunnels. The m,p-xylene/ethylbenzene ratio ranged from 2.2 to 5.7, from 1.4 to 3.3, from 2.0 to 7.7, from 1.4 to 1.5 and from 5.5 to 8.1 in Liangshan, Yueguangshan, Zoying, Guogang and Zhongliao Tunnels, respectively. Notably, those high ΣX/E ratios in all tunnels reflect a fresh air parcel in the tunnels due to the enclosed/half-enclosed environment. Nevertheless, it is important that the characteristics of X/E in different traffic tunnels are explored.

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Section: Mtbe-btex Ratios In Different Tunnelssupporting

confidence: 91%

Section: Sampling and Instrumentsmentioning

confidence: 99%

Section: Toluene/benzene (T/b) Ratios In Different Tunnelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurements and Correlations of MTBE and BETX in Traffic Tunnels

Hsieh

Wang

Yang

et al. 2011

Aerosol Air Qual. Res.

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Adsorption of Methyl tert‐butyl Ether on Perfluorooctyl Alumina Adsorbents – High Concentration Range

2007

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The performance of two types of perfluorooctyl alumina (PFOAL) adsorbents prepared using c-alumina (PFOAL A ) and alumina-active-basic® (PFOAL B ) is reported. The equilibrium adsorption behavior of the adsorbents was studied for adsorption of methyl tert-butyl ether (MTBE) in a wide range (5-1000 mg/L) of aqueous phase MTBE concentrations. The monolayer adsorption capacities were 3.3 and 3.5 mg MTBE/g adsorbent, and the maximum adsorption capacities were 7.1 and 6.3 mg MTBE/g adsorbent for PFOAL A and PFOAL B, respectively. The application of Freundlich, Langmuir, BET and BDDT (the general form of BET) isotherms were compared for the modeling of aqueous adsorption of MTBE on the surface of PFOAL adsorbents. It was shown that adsorption of MTBE on the surface of PFOAL is a type IV van der Waals adsorption, which is best modeled by the general form of the BET (BDDT) multilayer adsorption isotherm.

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Kinetics of Catalytic Ozonation of Methyl tert‐Butyl Ether in the Presence of Perfluorooctyl Alumina

2009

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In this work, the kinetics of heterogeneous ozonation of methyl tert-butyl ether (MTBE) in the presence of perfluorooctyl alumina (PFOAL) catalysts is presented. Activity of the PFOAL catalysts in ozonation reactions of MTBE was studied in a batch reactor over the temperature range of 25 to 40°C. The results show that PFOAL is an effective catalyst for enhancing the molecular mechanism of ozone reactions. For a catalyst concentration of 5 g/L, the contribution of the rate of heterogeneous catalytic reaction in the total reaction rate is about 50 %, 75 %, and 85 % at the reaction temperatures of 25°C, 30°C, and 40°C, respectively. Kinetic studies showed that the chemical reaction of ozone and MTBE is the controlling step in this catalytic system. The quasi-homogeneous kinetic model proved to be an appropriate approach in modeling the heterogeneous reaction of ozone with MTBE on PFOAL catalysts.

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Ambient BTEX and MTBE in the neighborhoods of different industrial parks in Southern Taiwan

Cited by 68 publications

References 32 publications

Measurements and Correlations of MTBE and BETX in Traffic Tunnels

Measurements and Correlations of MTBE and BETX in Traffic Tunnels

Adsorption of Methyl tert‐butyl Ether on Perfluorooctyl Alumina Adsorbents – High Concentration Range

Kinetics of Catalytic Ozonation of Methyl tert‐Butyl Ether in the Presence of Perfluorooctyl Alumina

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