The present invention relates to an apparatus and a method for measuring organic element carbon contained in ultrafine dusts. More particularly, the present invention relates to an apparatus and method for measuring organic element carbon contained in ultrafine dusts, And more particularly, to an apparatus and method for measuring organic element carbon contained in ultrafine dust. The present invention relates to an oven for generating methane by heating an ultrafine dust-trapped filter disposed therein; A carbon calculator for measuring an amount of methane produced in the oven and calculating an amount of carbon contained in the measured methane; A light receiving unit for receiving the reflected light reflected by the filter and the transmitted light transmitted through the filter, and outputting the light amount of the reflected light and the transmitted light; A transmittance calculating unit for outputting the reflectance and transmittance of the filter with respect to the laser in comparison with the amount of light irradiated by the laser light source, the light amount of the reflected light and the transmitted light provided by the light receiving unit; Calculating the amount of organic carbon and the amount of elemental carbon contained in the ultrafine dust using the amount of carbon contained in the methane provided by the carbon calculation unit and the reflectivity and the transmittance of the filter with respect to the laser provided by the permeability calculation unit And an organic carbon calculating unit. Here, the apparatus for measuring organic element carbon included in the ultrafine dust may further include a temperature sensor for measuring a temperature inside the oven, and the permeability calculating unit may calculate the permeability of the filter using the temperature Temperature information of the oven provided by the sensor can be further utilized.;
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