Untitled

MacIntosh, David L.; Zimmer-Dauphinee, Susan; Manning, Randall O.; Williams, Phillip L.

doi:10.1023/a:1006234610865

Cited by 12 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The air inlet was located 5 m above ground level. The atmospheric air samplings at the Center site were collected during summer (January 29-February 14) and winter (July [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]2002). The sampling system was placed 3.0 meters above ground level and 2.5 meters far from the nearest street.…”

Section: Sampling Of Aldehydesmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of rural and urban atmospheric aldehydes in Londrina, Brazil

Pinto¹,

Solci²

2007

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Os níveis ambientais de formaldeído e acetaldeído foram medidos em três locais na cidade de Londrina: na estação central de ônibus urbano, no centro (perfis diurno e noturno) e em área rural, no verão e inverno de 2002. Os aldeídos foram coletados em cartuchos Sep-Pak revestidos com 2,4-DNPH e analisados por CLAE/AFD. Na estação central as razões de mistura de formaldeído e acetaldeído, estiveram, respectivamente, na faixa de 6,17 a 10,43 ppbv e 0,49 a 2,12 ppbv. No centro, durante o verão, os níveis do formaldeído variaram de 2,07 a 5,65 ppbv e do acetaldeído variaram de 1,05 a 5,06 ppbv. Durante o inverno, as concentrações diurnas de formaldeído e acetaldeído foram mais elevadas do que as noturnas. As razões de mistura do formaldeído e acetaldeído variaram de 3,24 a 9,46 ppbv e 2,81 a 10,83 ppbv, respectivamente. Na área rural as razões de mistura de formaldeído e acetaldeído variaram de 0,64 a 1,41 ppbv e 0,10 a 0,87 ppbv, respectivamente. As razões de acetaldeído/formaldeído foram comparadas com valores obtidos em outras cidades brasileiras.Ambiental levels of formaldehyde and acetaldehyde were measured at three sites in the city of Londrina: at the central bus station, downtown (night and day profiles) and in a rural area, during the summer and winter seasons of 2002. Atmospheric aldehydes were collected using C18 Sep-Pak cartridges coated with 2,4-DNPH and analyzed by HPLC-DAD. At the central bus station, the measured mixing atios for formaldehyde and acetaldehyde ranged, respectively, from 6.17 to 10.43 ppbv and from 0.49 to 2.12 ppbv. Downtown, during the summer, formaldehyde levels ranged from 2.07 to 5.65 ppbv, and acetaldehyde levels ranged from 1.05 to 5.06 ppbv. During the winter, the daytime concentrations for formaldehyde and acetaldehyde were higher than nighttime levels. Formaldehyde and acetaldehyde mixing ratios ranged from 3.24 to 9.46 ppbv and from 2.81 to 10.83 ppbv, respectively. At the rural site, formaldehyde and acetaldehyde mixing ratios ranged from 0.64 to 1.41 ppbv and from 0.10 to 0.87 ppbv, respectively. The acetaldehyde/formaldehyde ratios were compared with values from other Brazilian cities.

show abstract

Section: Sampling Of Aldehydesmentioning

confidence: 99%

“…These levels are common FA and AA mixing ratios for unpolluted areas, and this is in accordance with published background values. 5,[25][26][27][28] In Table 3 the results are compared with data from other areas.…”

Section: Aldehyde Mixing Ratios At the Farm Site-winter Samplingmentioning

confidence: 99%

Comparison of rural and urban atmospheric aldehydes in Londrina, Brazil

Pinto¹,

Solci²

2007

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

Environmental Aldehyde Sources and the Health Implications of Exposure

Sinharoy

McAllister

Vasu

et al. 2019

Aldehyde Dehydrogenases

View full text Add to dashboard Cite

Photochemical Production of Atmospheric Carbonyls in a Rural Area in Southern China

Guo

Chen

et al. 2014

Arch Environ Contam Toxicol

View full text Add to dashboard Cite

For the first time, ambient carbonyls were measured in a rural area in southern China from August 2012 to February 2013 to investigate their distribution characteristics and sources. Formaldehyde, acetaldehyde, and acetone were the three most abundant carbonyls, which accounted for 83-95 % of total seven carbonyls identified. The O3 formation potential of carbonyls in summer (59.55 μg/m(3)) was approximately ten times greater than that (6.37 μg/m(3)) in winter, and calculated photolysis rates were significantly faster in summer than those in winter, suggesting intensive photochemical activities in summer. Seasonal and diurnal variations of carbonyls showed that (1) the concentration of total carbonyls in summer (12.62 ± 10.83 μg/m(3)) was approximately five times greater than that in winter (2.33 ± 0.90 μg/m(3)), and a similar trend applied to the three abundant carbonyls; (2) the average summer to winter (S/W) ratio of formaldehyde and acetaldehyde was 10-13, and the S/W ratio of acetone was ~2.59; and (3) the highest concentrations of the three carbonyls and total carbonyls occurred at 14:00-16:00 with high temperature and intensive sunlight, especially in summer. These variations provided direct evidence for significant photochemical production of ambient carbonyls. Average C1/C2 ratios (3.07 ± 1.62) in summer were much greater than those (1.28 ± 0.25) in winter, and average C2/C3 ratios (35.09 ± 58.67) in summer were significantly greater than those (4.75 ± 2.12) in winter, both cases indirectly implying positive photochemical productions in summer. Especially, strong correlations (R(2) = 0.63-0.98) of temperature and sunlight intensity with the three abundant carbonyls and total carbonyls were observed, indicating a similar causal source such as significant photochemical production.

show abstract

Untitled

Cited by 12 publications

References 17 publications

Comparison of rural and urban atmospheric aldehydes in Londrina, Brazil

Comparison of rural and urban atmospheric aldehydes in Londrina, Brazil

Environmental Aldehyde Sources and the Health Implications of Exposure

Photochemical Production of Atmospheric Carbonyls in a Rural Area in Southern China

Contact Info

Product

Resources

About