Vapor Pressure Data of Soybean Oil, Castor Oil, and Their Fatty Acid Ethyl Ester Derivatives

Ndiaye, Papa M.; Tavares, Frederico W.; Dalmolin, Irede Angela Lucini; Dariva, Cláudio; Oliveira, Débora de; Oliveira, J. Vladimir

doi:10.1021/je049898o

Cited by 35 publications

(25 citation statements)

References 14 publications

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“…Afterwards the cell was dried, weighed and connected to the mobile part of the equipment. As one should expect, the degassing step has led in all circumstances to negligible solvent mass losses [21].…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 95%

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Low-pressure solubility of propane and n-butane in refined soybean oil

Tres

Mohr

Luccio

et al. 2009

The Journal of Chemical Thermodynamics

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Section: Apparatus and Experimental Proceduresmentioning

confidence: 95%

“…In fact, vapour pressure values reported for refined soybean oil over the temperature range of (290 to 355) K and pressure (0.35 to 2.16) kPa [21].…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%

Low-pressure solubility of propane and n-butane in refined soybean oil

Tres

Mohr

Luccio

et al. 2009

The Journal of Chemical Thermodynamics

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“…The highest concentration and proportion of COA in autumn were likely caused by strong emissions from charcoal-grilling or barbecue activities, which are popular in Beijing and surrounding areas in autumn as mentioned above. Fewer cooking activities during and around the Chinese New Year holiday (7-19 February) and the lower evaporation rates of cooking oils (Ndiaye et al, 2005) led to the lower concentration and proportion of COA in winter (Fig. S35).…”

Section: Investigating Oa Sources With Pmfmentioning

confidence: 99%

Seasonal variations in high time-resolved chemical compositions, sources, and evolution of atmospheric submicron aerosols in the megacity Beijing

et al. 2017

Atmos. Chem. Phys.

143

101

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Abstract. A severe regional haze problem in the megacity Beijing and surrounding areas, caused by fast formation and growth of fine particles, has attracted much attention in recent years. In order to investigate the secondary formation and aging process of urban aerosols, four intensive campaigns were conducted in four seasons between March 2012 and March 2013 at an urban site in Beijing (116.31 • E, 37.99 • N). An Aerodyne highresolution time-of-flight aerosol mass spectrometry (HRToF-AMS) was deployed to measure non-refractory chemical components of submicron particulate matter (NR-PM 1 ). The average mass concentrations of PM 1 (NR-PM 1 +black carbon) were 45.1 ± 45.8, 37.5 ± 31.0, 41.3 ± 42.7, and 81.7 ± 72.4 µg m −3 in spring, summer, autumn, and winter, respectively. Organic aerosol (OA) was the most abundant component in PM 1 , accounting for 31, 33, 44, and 36 % seasonally, and secondary inorganic aerosol (SNA, sum of sulfate, nitrate, and ammonium) accounted for 59, 57, 43, and 55 % of PM 1 correspondingly. Based on the application of positive matrix factorization (PMF), the sources of OA were obtained, including the primary ones of hydrocarbonlike (HOA), cooking (COA), biomass burning OA (BBOA) and coal combustion OA (CCOA), and secondary component oxygenated OA (OOA). OOA, which can be split into moreoxidized (MO-OOA) and less-oxidized OOA (LO-OOA), accounted for 49, 69, 47, and 50 % in four seasons, respectively. Totally, the fraction of secondary components (OOA+SNA) contributed about 60-80 % to PM 1 , suggesting that secondary formation played an important role in the PM pollution in Beijing, and primary sources were also non-negligible. The evolution process of OA in different seasons was investigated with multiple metrics and tools. The average carbon oxidation states and other metrics show that the oxidation state of OA was the highest in summer, probably due to both strong photochemical and aqueousphase oxidations. It was indicated by the good correlations (r = 0.53-0.75, p < 0.01) between LO-OOA and odd oxygen (O x = O 3 + NO 2 ), and between MO-OOA and liquid water content in aerosols. BBOA was resolved in spring and autumn, influenced by agricultural biomass burning (e.g., field preparation burnings, straw burning after the harvest). CCOA was only identified in winter due to domestic heating. These results signified that the comprehensive management for biomass burning and coal combustion emissions is needed. High concentrations of chemical components in PM 1 in Beijing, especially in winter or in adverse meteorological conditions, suggest that further strengthening the regional emission control of primary particulate and precursors of secondary species is expected.

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“…The equipment used to measure the vapour pressure of the compounds investigated in this work is shown schematically in figure 1, and is very similar to that used by Dariva et al [20] and Ndiaye et al [21]. The equilibrium cell is made of Pyrex glass and has a conical shape, having a total capacity of approximately 30 cm 3 .…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%