Probing the impact of a phytoplankton bloom on the chemistry of nascent sea spray aerosol using high-resolution mass spectrometry

Radoman, Nikola; Christiansen, Sofus; Johansson, Jana H.; Hawkes, Jeffrey A.; Bilde, Merete; Cousins, Ian T.; Salter, Matthew

doi:10.1039/d2ea00028h

Cited by 6 publications

(8 citation statements)

References 115 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Together, the lower O/C and higher H/C values in the SML indicate that those molecules may be more hydrophobic. This is consistent with previous studies of DOM in SML and subsurface waters that found the SML DOM to have more formulas containing H/C > 1.25 and O/C in the range of 0.10–0.40. , Also, the consistently lower O/C in the SML samples, compared to the subsurface water samples, suggests that there is no additional photochemical processing in the SML beyond that in the subsurface water …”

Section: Discussionmentioning

confidence: 96%

“…Together, this indicates that a large fraction of the identified organic formulas are aliphatic and that these formulas are representative of molecules that are similar in composition, including H/C and O/C, of known surfactants, lipids, and fatty acids. 33,34,38 Previous studies identified aliphatic formulas as those containing H/C greater than 1.0 and a DBE to carbon (DBE/C) ratio of less than 0.3. 39 In this study, average DBE for each sample ranged from 7.36 to 8.41, for both ionization modes, and average DBE/C ranged from 0.31 to 0.47 (median of 0.35).…”

Section: Characteristics Of Organic Compoundsmentioning

confidence: 99%

“…The combination of tensiometry and mass spectrometry can confirm the presence of surfactants and identify their formulas. Mass spectrometry is commonly used to characterize DOM found in marine environments. − With the use of high-resolution mass spectrometry, chemical formulas can be assigned to natural DOM signals. , These formulas have previously been used to broadly classify organic compounds into groups based on hydrogen-to-carbon (H/C) and oxygen-to-carbon (O/C) ratios. ,,, Additionally, using tandem mass spectrometry techniques, ion fragmentation can be used to identify the chemical structures of individual DOM signals. The use of both positive and negative ionization modes contributes unique information about the composition of DOM …”

Section: Introductionmentioning

confidence: 99%

“…35−38 With the use of highresolution mass spectrometry, chemical formulas can be assigned to natural DOM signals. 38,39 These formulas have previously been used to broadly classify organic compounds into groups based on hydrogen-to-carbon (H/C) and oxygento-carbon (O/C) ratios. 33,37,40,41 Additionally, using tandem mass spectrometry techniques, ion fragmentation can be used to identify the chemical structures of individual DOM signals.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies using high-resolution mass spectrometry have observed organic compounds in the SML to have high H/C and low O/C values. ,, Other studies have identified sulfur-containing molecules and fatty acids , in marine organic compounds that may be surfactant-like.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Organic Signatures of Surfactants and Organic Molecules in Surface Microlayer and Subsurface Water of Delaware Bay

Burdette

Bramblett

Deegan

et al. 2022

ACS Earth Space Chem.

View full text Add to dashboard Cite

Surface-active species are present in marine waters and can accumulate in the surface microlayer (SML). Surfactants are amphiphilic organic compounds that reduce surface tension at an interface. Current work is investigating the link between the molecular composition of surfactants in the SML and those in subsurface waters, as well as the differences in surfactant molecular composition across different water types. In this study, subsurface water and SML samples were collected on three sampling days at three sites in the Delaware Bay: the Mouth of the Bay, Mid-Bay, and the marsh-influenced Broadkill River. Organic matter was extracted from the SML and subsurface water using two solid-phase extractions (graphitized carbon and C18) and then analyzed using tensiometry and high-resolution mass spectrometry, in positive and negative ionization modes. Here, we show that molecules with high H/C are preferentially enriched in the SML compared to the subsurface waters. We demonstrate that the measured organic extracts contribute to lower surface tensions in the SML. A rainfall event led to increased terrestrial runoff and mixing that altered the composition of the organic molecules in the SML and subsurface waters of the Broadkill River site, and the composition of the extracted organic molecules varied across sampling days. These results imply that the surfactant compositions are not uniform across sampling regions or from the subsurface to the SML.

show abstract

Section: Discussionmentioning

confidence: 96%