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Erik Swietlicki. Foto.

Erik Swietlicki

Professor

Erik Swietlicki. Foto.

Towards the isolation and estimation of elemental carbon in atmospheric aerosols using supercritical fluid extraction and thermo-optical analysis

Författare

  • Hafiz Abdul Azeem
  • Johan Martinsson
  • Kristina Eriksson Stenström
  • Erik Swietlicki
  • Margareta Sandahl

Summary, in English

Air-starved combustion of biomass and fossil fuels releases aerosols, including airborne carbonaceous particles, causing negative climatic and health effects. Radiocarbon analysis of the elemental carbon (EC) fraction can help apportion sources of its emission, which is greatly constrained by the challenges in isolation of EC from organic compounds in atmospheric aerosols. The isolation of EC using thermo-optical analysis is however biased by the presence of interfering compounds that undergo pyrolysis during the analysis. EC is considered insoluble in all acidic, basic, and organic solvents. Based on the property of insolubility, a sample preparation method using supercritical CO2 and methanol as co-solvent was developed to remove interfering organic compounds. The efficiency of the method was studied by varying the density of supercritical carbon dioxide by means of temperature and pressure and by varying the methanol content. Supercritical CO2 with 10% methanol by volume at a temperature of 60 °C, a pressure of 350 bar and 20 min static mode extraction were found to be the most suitable conditions for the removal of 59 ± 3% organic carbon, including compounds responsible for pyrolysis with 78 ± 16% EC recovery. The results indicate that the method has potential for the estimation and isolation of EC from OC for subsequent analysis methods and source apportionment studies.

Avdelning/ar

  • Centrum för analys och syntes
  • Centrum för miljö- och klimatvetenskap (CEC)
  • Kärnfysik
  • MERGE: ModElling the Regional and Global Earth system

Publiceringsår

2017-07

Språk

Engelska

Sidor

4293-4300

Publikation/Tidskrift/Serie

Analytical and Bioanalytical Chemistry

Volym

409

Issue

17

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Analytical Chemistry

Nyckelord

  • Atmospheric aerosols
  • Elemental carbon
  • Pyrolytic organic carbon
  • Source apportionment
  • Supercritical carbon dioxide
  • Thermo-optical analysis

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1618-2642