Emerging investigator series: Spatial distribution of dissolved organic matter in ice and at air-ice interfaces

Subha Chakraborty, Tara F Kahan

Research output: Contribution to journalArticle

Abstract

Dissolved organic matter (DOM) is a common solute in snow and ice at Earth's surface. Its effects on reaction kinetics in ice and at air-ice interfaces can be large, but are currently difficult to quantify. We used Raman microscopy to characterize the surface and bulk of frozen aqueous solutions containing humic acid, sodium dodecyl sulfate (SDS), and citric acid at a range of concentrations and temperatures. The surface-active species (humic acid and SDS) were distributed differently than citric acid. Humic acid and SDS are almost completely excluded to the air-ice interface during freezing, where they form a film that coats the surface nearly completely. A liquid layer that coats the majority of the surface was observed at all humic acid and SDS concentrations. Citric acid, which is smaller and less surface active, is excluded to liquid channels at the air-ice interface and within the ice bulk, as has previously been reported for ionic solutes such as sodium chloride. Incomplete surface wetting was observed at all citric acid concentrations and at all temperatures (up to -5 °C). Citric acid appears to be solvated in frozen samples, but SDS and humic acid do not. These results will improve our understanding of the effects of organic solutes on environmental and atmospheric chemistry within ice and at air-ice interfaces.

Original languageEnglish (US)
Pages (from-to)1076-1084
Number of pages9
JournalEnvironmental Science: Processes and Impacts
Volume21
Issue number7
DOIs
StatePublished - Jul 1 2019

Fingerprint

Ice
dissolved organic matter
Biological materials
Spatial distribution
Humic Substances
Air
Research Personnel
citric acid
spatial distribution
ice
Citric Acid
Sodium Dodecyl Sulfate
humic acid
air
sodium
sulfate
solute
Atmospheric chemistry
Snow
liquid

ASJC Scopus subject areas

  • Environmental Chemistry
  • Public Health, Environmental and Occupational Health
  • Management, Monitoring, Policy and Law

Cite this

Emerging investigator series : Spatial distribution of dissolved organic matter in ice and at air-ice interfaces. / Chakraborty, Subha; Kahan, Tara F.

In: Environmental Science: Processes and Impacts, Vol. 21, No. 7, 01.07.2019, p. 1076-1084.

Research output: Contribution to journalArticle

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