A new quadrupole time-of-flight mass spectrometer has been acquired in collaboration with Assist. Prof. L. Vergeynst and Assist. Prof. Z. Wei from Dept. of Engineering. The instrument is mainly funded by a grant from the Carlsberg Foundation. The instrument will be used for analysis of e.g. organic compounds in atmospheric aerosol particles and transformation of micropollutants in water and sewage sludge.