Semivolatile behaviour and filter sampling artifacts for dicarboxylic acids during summer campaigns at three forested sites in europe

摘要

The sampling artifacts for C 2 –C 5 dicarboxylic acids (DCAs) were studied by collecting high-volume PM 2.5 samples using front and back quartz-fibre filters. The filters were ana- lysed for carbonaceous components, and for inorganic cationic and anionic and organic anionic species. Back/front filter ratios were determined for the C 2 –C 5 DCAs, but also for methanesulphonate (MSA – ), the various inorganic species, and the carbonaceous compo- nents. The sampling artifacts for the inorganic species were small (< 5%) with the excep- tion of those for nitrate. The median back/front filter ratios for MSA – and the C 2 –C 5 DCAs increased in the following order: oxalate (1.5%)–succinate (3%)–MSA – (4%)–malonate (2%–9%)–glutarate (7%–26%). Most of these ratios are smaller than those that were obtained for organic carbon, total carbon, and especially water-soluble organic carbon. Our back/front ratios for the C 2 –C 5 DCAs are lower to much lower than those found in other studies.