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Carbon analysis consists in the evaluation of the carbonaceous content ofthe aerosol (TC) but, more importantly, of its distribution between the twocomponents EC (Elemental Carbon) and OC (Organic Carbon) that arecharacterized by different physical-chemical properties. In spite of thenumerous studies focused on this topic, nowadays a universal methodology forthe determination of the two components EC and OC is not available. In factOC and EC (also known as black carbon or soot) are operationally defined bythe method of analysis and, as a consequence, different methods can producedifferent results.In this paper we present results on the application of TGA/FT-IR(Thermo-gravimetric Analysis/Fourier Transformed Infrared Spectroscopy) tothe characterization of carbonaceous aerosols. The analytical methodologywas applied to PM10 (particulate matter with aerodynamic diameter smallerthan 10 μm) four-hour time resolution samples collected in Milan urbanarea. The method is a two-steps thermal one and it is based on the differentthermal behaviour of OC and EC. It has been set up analyzing suitablestandards containing both organic and elemental carbon. Carbonquantification is achieved by on-line, continuous monitoring of CO2infrared absorption at 2361 cm−1. A good separation between OC and ECon particulate matter (PM) samples has been obtained. Ranges and averagevalues were 12–70 μg/m3 and 20 μg/m3 for OC and 0.2–6 μg/m3and 2 μg/m3 for EC. On average OC and EC made up29 (±13)% and 2.5 (±1.8)% of the PM10 fraction,respectively. The method reliability has been verified by a preliminarycomparison with TOT (Thermal Optical Transmission) technique. OC and ECvalues determined for ambient samples of PM10 were correlated withmeteorological parameters as well as with Radon concentrations

A TGA/FT-IR study for measuring OC and EC in aerosol samples