A technique for rapid source apportionment applied to ambient organic aerosol measurements from a thermal desorption aerosol gas chromatograph (TAG) was written by Zhang, Yaping;Williams, Brent J.;Goldstein, Allen H.;Docherty, Kenneth S.;Jimenez, Jose L.. And the article was included in Atmospheric Measurement Techniques in 2016.Electric Literature of C15H22O2 The following contents are mentioned in the article:
We present a rapid method for apportioning the sources of atm. organic aerosol composition measured by gas chromatog.-mass spectrometry methods. Here, we specifically apply this new anal. method to data acquired on a thermal desorption aerosol gas chromatograph (TAG) system. Gas chromatograms are divided by retention time into evenly spaced bins, within which the mass spectra are summed. A previous chromatogram binning method was introduced for the purpose of chromatogram structure deconvolution (e.g., major compound classes). Here we extend the method development for the specific purpose of determining aerosol samples’ sources. Chromatogram bins are arranged into an input data matrix for pos. matrix factorization (PMF), where the sample number is the row dimension and the mass-spectra-resolved eluting time intervals (bins) are the column dimension. Then two-dimensional PMF can effectively do three-dimensional factorization on the three-dimensional TAG mass spectra data. The retention time shift of the chromatogram is corrected by applying the median values of the different peaks’ shifts. Bin width affects chem. resolution but does not affect PMF retrieval of the sources’ time variations for low-factor solutions A bin width smaller than the maximum retention shift among all samples requires retention time shift correction. A six-factor PMF comparison among aerosol mass spectrometry (AMS), TAG binning, and conventional TAG compound integration methods shows that the TAG binning method performs similarly to the integration method. However, the new binning method incorporates the entirety of the data set and requires significantly less pre-processing of the data than conventional single compound identification and integration. In addition, while a fraction of the most oxygenated aerosol does not elute through an underivatized TAG anal., the TAG binning method does have the ability to achieve mol. level resolution on other bulk aerosol components commonly observed by the AMS. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Electric Literature of C15H22O2).
2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Electric Literature of C15H22O2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics