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Henrys Law Constant Of Glyoxal - Research Paper Example

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Experimental research evidence shows that heterogeneous chemical reactions play an imperative role in gas particle partitioning of the organic compounds. This results in the formation of development of secondary organic aerosols (SOA) in the atmosphere.
Acidity, ionic strength and sulfate effects on Henry's law constants (KH) of formaldehyde, glyoxal and methylglyoxal were investigated by bubble column technique…
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Henrys Law Constant Of Glyoxal
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Download file to see previous pages The enhancement of KH was linked to the sulfate: carbonyl molar ratio rather than the absolute concentration of sulfate ions in bulk solution. The profound sulfate effect was only observed in glyoxal and formaldehyde, but not methylglyoxal. Chemical analysis suggested that this sulfate mediated reaction was reversible. Meanwhile, Time of Flight-MS (TOF-MS), NMR spectroscopy and X-ray diffraction (XRD) suggested the unknown product was sulfate containing product. For ionic strength effect, KH of formaldehyde, methylglyoxal and glyoxal were investigated in NaCl solution with concentrations ranging from 25mM to 4M. Our observation suggested that the formation of hydrogen bonding between chloride ions and diol groups of the hydrated carbonyls lead to "salting-in" effects in concentrated NaCl solution. The partitioning process of these small, reactive carbonyls was not sensitive to the ionic strength of wet aerosols and the profound effects of sulfate on glyoxal KH supported the hypothesis that sulfate play an important role in glyoxal gas/aqueous phase partitioning.
The Henry law constant KH is a key parameter that aids in the...
2.2 Experimentation Methods 6
3.0 Results and Discussion 7
3.1 Formaldehyde 7
Product Identification 9
3.2 Glyoxal 10
3.3 Methylglyoxal 13
4.0 Conclusion 14
Work cited 16
Appendix 25
1.0 Introduction
The Henry law constant KH is a key parameter that aids in the determination of the magnitude, rate and flux direction between the aqueous and the gas solution. Due to the insufficient thermodynamic data and poor understanding in gas/particle partitioning behaviors of glyoxal and other oxidation products from both anthropogenic and biogenic volatile organic compounds (VOCs), discrepancies between field measurements and SOA models were large (Volkamer et al., 2006). In particular, the partitioning process of C2, C3-bifunctional species, formed in significant yields from the photo-oxidation of aromatic hydrocarbons, isoprene, terepene, alkenes as well as alkynes, remain unclear [Yu et al., 1995; Yu et al., 1997; Yu et al., 1998; Yu et al., 1999; Warneck, 2003].
Field measurements have revealed that these low molecular weight, bi-functional species are important precursors for SOA in cloud-processing [Blando and Turpin, 2000; Warneck, 2003]. Laboratory evidence suggests that, the rate-limiting step in SOA formation of isoprene photo-oxidation was the oxidation of first-generation reaction products which leads to the formation of up to four functional groups of the carbon skeleton. Therefore, the partitioning of chemical species containing multifunction groups could be more likely a critical step for formation of SOA in other systems as well (Kroll et al, 2006). Recently, glyoxal was used as an activity indicator for photo-oxidation attributed to its high abundance after onset of sunlight and short lifetime, while formaldehyde worked ...Download file to see next pagesRead More
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