A comparison of carbonyl compound concentrations at urban roadside and indoor sites

Williams, I.D.; Revitt, D. Mike; Hamilton, R.

doi:10.1016/0048-9697(96)05248-5

Cited by 48 publications

(32 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These numbers are relevant for atmospheric science, for which formaldehyde is an important molecule. Formaldehyde is present in the atmosphere at concentration of ∼ 50 pptv (parts per trillion by volume) in clean tropospheric air [2] and up to 10-70 ppbv (parts per billion by volume) in the air in urban centers [3,4]. By excitation of theÃ 1 A 2 ←X 1 A 1 transition in the 260-360 nm wavelength range two dissociation channels [5,6] with high quantum yields [7,8,9,10,11,12] are open: (a) H 2 CO+hν → H 2 + CO and (b) H 2 CO+hν → H + HCO.…”

Section: Spectroscopy Of Theãmentioning

confidence: 99%

Spectroscopy of the transition of formaldehyde in the 30140–30790cm−1 range: The and rovibrational bands

Motsch

Schenk

Zeppenfeld

et al. 2008

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

Room-temperature absorption spectroscopy of theÃ 1 A 2 ←X 1 A 1 transition of formaldehyde has been performed in the 30140-30790 cm −1 range allowing the identification of individual lines of the 2 1 0 4 3 0 and 2 2 0 4 1 0 rovibrational bands. Using tunable ultraviolet continuous-wave laser light, individual rotational lines are well resolved in the Doppler-broadened spectrum. Making use of genetic algorithms, the main features of the spectrum are reproduced. Spectral data is made available as Supporting Information.

show abstract

Section: Spectroscopy Of Theãmentioning

confidence: 99%

Spectroscopy of the transition of formaldehyde in the 30140–30790cm−1 range: The and rovibrational bands

Motsch

Schenk

Zeppenfeld

et al. 2008

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

show abstract

“…Among these carbonyl compounds, formaldehyde is the most abundant species, followed by acetaldehyde. 14,15 It has been estimated that the secondary production of low-molecular-weight aldehydes usually predominates over direct emission from vehicle exhaust. 16 In this study, the speciation and photochemical reactivity of the exhaust gas VOCs and carbonyls from both new and in-use motorcycles were investigated.…”

Section: Discussionmentioning

confidence: 99%

Volatile Organic Proﬁles and Photochemical Potentials from Motorcycle Engine Exhaust

Tsai

Liu

Yang

et al. 2003

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

This study surveyed emissions from 2-and 4-stroke new and in-use motorcycles. Emission tests were carried out on a dynamometer following the designated test procedure of the Economic Commission for Europe (ECE). Samples were derived during various driving stages, which included idle, acceleration, 30 km/hr cruise, 50 km/hr cruise, and deceleration. All test motorcycles (10 new and 15 in-use) complied with Taiwan Environmental Protection Administration's Phase III Motorcycle Emission Standards. The dominant volatile organic carbon (VOC) species were isopentane (53 and 295 mg/km, 2-and 4-stroke, respectively), 2-methylpentane (75 and 83 mg/km), 3-methylpentane (34 and 66 mg/km), and toluene (30 and 100 mg/km). The VOC emission factors for the 2-/4-stroke motorcycles were 311/344 (new) and 1479/433 (inuse) mg/km, respectively. In addition, the dominant carbonyl species for the new and in-use motorcycles were formaldehyde (0.4 and 0.7 mg/km, respectively), acetaldehyde (0.6 and 1.2 mg/km), and acetone (0.5 and 0.7 mg/km). The carbonyl compound emission factors for the 2-and 4-stroke motorcycles were 3.2/3.1 (new) and 5.3/ 4.6 (in-use) mg/km, respectively. The ozone formation potentials, based on an ECE test cycle, show that the values from the in-use motorcycles were higher than those from the new motorcycles. The dominant VOC species for the ozone formation potential were propylene (65 and 502 mg-O 3 /km, respectively), isopentane (98 and 501 mg-O 3 /km), 2-methylpentane (152 and 167 mg-O 3 / km), 3-methylpentane (79 and 253 mg-O 3 /km), and toluene (127 and 398 mg-O 3 /km). Further, the dominant carbonyl species were formaldehyde (4.1 and 6.2 mg-O 3 / km, new and in-use, respectively) and acetaldehyde (4.8 and 9 mg-O 3 /km).

show abstract

“…Column: CP Wax (diameter: 0.25 mm, Length: 60 m, film thickness: 2.5 μm) (Muller, 1997;Williams et al, 1996). 그리고 이들 성분이 실내에 존 재할 경우, ppb 단위의 낮은 농도에도 건강에 해로운 영향을 미칠 수도 있다 (Horvath et al, 1988).…”

Section: Gc (Shimadzu Gc-2010 Japan) Ms (Shimadzu Gcms-qp2010 Japan)unclassified

A Study of Odorants and Volatiles Released from Pork Belly Meat When Treated by Different Cooking Methods

Kim¹,

Kim²,

Kim³

et al. 2014

Journal of Korean Society for Atmospheric Environment

View full text Add to dashboard Cite

A comparison of carbonyl compound concentrations at urban roadside and indoor sites

Cited by 48 publications

References 6 publications

Spectroscopy of the transition of formaldehyde in the 30140–30790cm−1 range: The and rovibrational bands

Spectroscopy of the transition of formaldehyde in the 30140–30790cm−1 range: The and rovibrational bands

Volatile Organic Proﬁles and Photochemical Potentials from Motorcycle Engine Exhaust

A Study of Odorants and Volatiles Released from Pork Belly Meat When Treated by Different Cooking Methods

Contact Info

Product

Resources

About