Multiproxy probing of rainwater dissolved organic matter (DOM) composition in coastal storms as a function of trajectory

Characterization of CHOS compounds in rainwater from continental and coastal storms by ultrahigh resolution mass spectrometry

“…The O:C and H:C of the CHOS compounds from the same study were 0.34 and 1.5, respectively. Although the elemental ratios of formulas detected in this study and the work by Mitra et al (2013) are similar, it is impossible to state that identical compounds are shared in the two sample sets. However, the similarity does suggest that the DOM isolated from rainwater at these different locations is similar in molecular composition.…”

“…Although continental derived storms have almost double the unique CHOS compounds as coastal rain, it appears there are only subtle differences between the rainwater CHOS containing formulas that are unique to each storm type. As a comparison to this study, terrestrial derived rainwater from southeastern United States was analyzed by FT-ICR MS and the distribution of CHOS molecular formulas was 14% of the total number of molecular formula assignments (Mitra et al, 2013). The O:C and H:C of the CHOS compounds from the same study were 0.34 and 1.5, respectively.…”

“…Distinct patterns emerge based upon when the O:C is plotted vs. the H:C. van Krevelen plots have been used to characterize distinct classes of organic matter found in atmospheric waters such as lipid-like material and condensed aromatic hydrocarbons (Altieri et al, 2012;Mitra et al, 2013;Wozniak et al, 2008). Clear differences have been observed in the composition of dissolved organic matter based upon the van Krevelen plots of CHO containing compounds in continental and coastal storms from a previous study (Mead et al, 2013).…”

“…Rainwater DOM is a complex heterogeneous mixture of organic compounds, the composition of which remains to a large extent unknown (Altieri et al, 2012;Mitra et al, 2013). This is particularly true when describing organic entities that contain one or more sulfur atoms (Zhao et al, 2013).…”

Molecular characteristics of the water soluble organic matter in size-fractionated aerosols collected over the North Atlantic Ocean

“…Approximately 10 mL of GF/F filtered WSOM was acidified (pH = 2) and solid-phase extracted using a styrene divinyl benzene polymer (PPL, Varian) cartridge following published procedures (Dittmar et al, 2008;Mitra et al, 2013). Prior to loading the WSOM, the PPL cartridge was rinsed with two cartridge volumes (~6 mL) of LC-MS grade methanol and MilliQ water.…”