Research Infrastructure ACTRIS-CZ.

Research infrastructure ACTRIS-CZ was adopted on the Czech national roadmap of reaserch infrastructures in 2016. Its coreforms a co-located station Košetice-Křešín u Pacova and special equipment from collaborating partner institutions. Research infrastructure ACTRIS-CZ is focused on atmospheric research, especially on atmospheric aerosol, reactive gases and meteorological parameters

Diffusion Battery – The Renewed Aerosol Spectrometer for Nanoparticles

The aim of the experiments was to develop new control software for the diffusion battery model DB 3040, in order to optimize measurements with this device. The software allows for larger variability of key control parameters of the diffusion battery and re-opens its application beyond determination of activity size distributions. In comparison with the most widely used method of aerosol spectrometry based on electrical mobility of particles, the method of diffusion battery can be advantageous in situations where we need to measure aerosols of relatively low concentrations with size distributions peaking bellow 20 nanometers

Polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and chlorinated pesticides in background air in central Europe - investigating parameters affecting wet scavenging of polycyclic aromatic hydrocarbons

Concentrations of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and chlorinated pesticides (CPs) were measured in air and precipitation at a background site in central Europe. Sigma PAH concentrations in air and rainwater ranged from 0.7 to 327.9 ng m(-3) and below limit of quantification (< LOQ) to 2.1 x 10(3) ng L-1. The concentrations of PCBs and CPs in rainwater were < LOQ. Sigma PCB and Sigma CP concentrations in air ranged from < LOQ to 44.6 and < LOQ to 351.7 pg m(-3), respectively. The potential relationships between PAH wet scavenging and particulate matter and rainwater properties were investigated. The concentrations of ionic species in particulate matter and rainwater were significantly correlated, highlighting the importance of particle scavenging process. Overall, higher scavenging efficiencies were found for relatively less volatile PAHs, underlining the effect of analyte gas-particle partitioning on scavenging process. The particulate matter removal by rain, and consequently PAH wet scavenging, was more effective when the concentrations of ionic species were high. In addition, the elemental and organic carbon contents of the particulate matter were found to influence the PAH scavenging