View Item 
        •   Utrecht University Student Theses Repository Home
        • UU Theses Repository
        • Theses
        • View Item
        •   Utrecht University Student Theses Repository Home
        • UU Theses Repository
        • Theses
        • View Item
        JavaScript is disabled for your browser. Some features of this site may not work without it.

        Browse

        All of UU Student Theses RepositoryBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

        On the measurement of absorption with an OC/EC analyser

        Thumbnail
        View/Open
        Ammerlaan_BAJ_Bachelor_thesis_2015.pdf (5.320Mb)
        Publication date
        2015
        Author
        Ammerlaan, B.A.J.
        Metadata
        Show full item record
        Summary
        We present a novel methodology to measure aerosol absorbing properties and mass metric quantities simultaneous in a single instrument. The laser in an OC/EC analyser, which measures organic carbon (OC) and elemental carbon (EC), is used to measure the attenuation coefficient of a filter laden with aerosol. A single calibration to the Multi-Angle Absorption Photometer (MAAP), which is in our study used as a reference method, is needed to link the attenuation by aerosol on the filter to the absorption coefficient of the aerosol in ambient air. We show that the attenuation coefficient with this method can be determined within a precision of 9.6%. The results of an independent data set show that the results of this methodology are comparable to widely distributed commercial absorption photometers. We further demonstrate that an unstable laser transmission signal in the Sunset Thermal/Optical Carbon Analyser possibly causes a bias in the fractioning of total carbon (TC) into OC and EC. The laser transmission signal during the analysis of instrument blank filters can give an indication of the possible bias. A deviation of the laser transmission signal of 10% leads to a substantial bias in EC content. It is therefore important to monitor the stability of the laser transmission signal during an instrument blank analysis frequently.
        URI
        https://studenttheses.uu.nl/handle/20.500.12932/21013
        Collections
        • Theses
        Utrecht university logo