Author/Authors :
T. S. Christoffersen، نويسنده , , J. Hjorth، نويسنده , , O. Horie، نويسنده , , N. R. Jensen، نويسنده , , D. Kotzias، نويسنده , , L. L. Molander، نويسنده , , P. Neeb، نويسنده , , L. Ruppert، نويسنده , , R. Winterhalter، نويسنده , , A. Virkkula، نويسنده , , Mary K. Wirtz، نويسنده , , B. R. Larsen، نويسنده ,
Abstract :
A method for the analysis of carboxylic acids in aerosols was developed, based on the collection of particles on Teflon filters (2.5 cm diameter with a 0.4 μm pore size), extraction with dichloromethane, and derivatization with BF3-methanol followed by analysis of the formed methylesters by large-volume injection GC/MS. In aerosol samples from smog chamber experiments with α-pinene and ozone, this method was applied and resulted in the identification for the first time of cis-pinic acid. Yields were in the range of 1-3% for 1000 pbbv α-pinene reacted with 750 pbbv ozone, and in in the range of 0.3-0.5% for 100 pbbv α-pinene reacted with 75 pbbv ozone. Being a dicarboxylic acid this product is estimated to possess an extremely low vapour pressure and may thus be an important element in gas-to-particle conversion of α-pinene.
