Development of simple pyrolysis correction method and evaluation of concentration trend of carbonaceous species in atmospheric fine particles

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Thermal method, usual measurement method of carbonaceous component of atmospheric fine particles, causes overestimation of elemental carbon(EC) due to pyrolysis of organic carbon(OC). Thermal optical method is capable of pyrolysis correction ; however, the instrument is expensive. In this study, a method that produces more precise EC concentration than usual by measurement of reflection intensity for a filter sample after sampling was developed. EC was measured by the developed method for the samples measured by thermal method previously, and annual trend of EC was reevaluated. EC was decreased compared to the data by thermal method in accordance with strengthened measures to exhaust gas of diesel vehicles.