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Thermal–optical analysis (TOA) is a widely used technique that fractionatescarbonaceous aerosol particles into organic and elemental carbon (OC and EC),or carbonate. Thermal sub-fractions of evolved OC and EC are also used forsource identification and apportionment; thus, oven temperature accuracyduring TOA analysis is essential. Evidence now indicates that the "actual"sample (filter) temperature and the temperature measured by the built-in oventhermocouple (or set-point temperature) can differ by as much as50 °C. This difference can affect the OC–EC split point selection andconsequently the OC and EC fraction and sub-fraction concentrations beingreported, depending on the sample composition and in-use TOA method andinstrument. The present study systematically investigates the influence of anoven temperature calibration procedure for TOA. A dual-optical carbonanalyzer that simultaneously measures transmission and reflectance (TOT andTOR) is used, functioning under the conditions of both the National Institute of Occupational Safety andHealth Method 5040 (NIOSH) andInteragency Monitoring of Protected Visual Environment (IMPROVE) protocols. The application of the oven calibration procedure to our dual-optics instrument significantly changed NIOSH 5040 carbon fractions (OC andEC) and the IMPROVE OC fraction. In addition, the well-known OC–EC splitdifference between NIOSH and IMPROVE methods is even further perturbedfollowing the instrument calibration. Further study is needed to determine ifthe widespread application of this oven temperature calibration procedurewill indeed improve accuracy and our ability to compare among carbonaceousaerosol studies that use TOA

The influence of temperature calibration on the OC–EC results from a dual-optics thermal carbon analyzer