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Schatting van de bijdrage van secundair organisch materiaal aan PM10
Gepubliceerd door: Publicatie datum:
ECN SF 1-3-2000
ECN publicatienummer: Publicatie type:
ECN-C--00-038 ECN rapport
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This report provides a very first estimate of the magnitude of thecontribution of secondary organic carbon to the concentration of fine particle mass (PM10) in the Netherlands, via an extrapolation of information gained in a literature search. Secondary organic carbon aerosol (SOC) is defined here as condensed organic material formed in the atmosphere by oxidation of organic gases. A major part of the literature used comes from the US and the LA-Basin. Much less information is available for Europe, and virtually nothing is known about the situation in the Netherlands. The information pertains mainly to the amounts of SOC but to a lesser extent also to organic carbon aerosol. From the measurements available in Northwest Europe, the contribution of total organic carbon to PM10 is estimated to be 20% (give or take 10%) in urban areas. In rural areas the contribution is somewhat higher, at an estimate of 25% (give or take 10%). The estimate of the contribution of SOC to PM10 is characterized by much uncertainty. A first estimate is that the contribution is 5-10% in urban areas and 5-20% in rural areas. It should be stressed that there are errors in the values used for the estimates here which are associated with artifacts during collection of the aerosol for analysis. The uncertainty in the reported values of some 50% is based on a number of studies on these artifacts in the US. Therefore, a more conservative estimate of the contribution of SOC to PM10 is 3-15% in urban areas up to a maximum of 3-30% in rural areas. A clear seasonal variation is observed for SOC, however, relative to total PM10 this variation is small. Only in episodes of photochemical smog the contribution is appreciably larger, in particular in the afternoon hours. Little is known about the sources. Two important sources were found: an important anthropogenic source is gasoline-powered vehicles, an important biogenic source is wood. 49 refs.

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