VOC emission instrumentation
Proton Transfer Reaction - Quadrupole Mass Spectrometer (PTR-QMS) is an instrument for monitoring various volatile orcanic compounds (VOC). We have coupled the PTR-QMS with the gas-exchange measurement system to monitor the VOC emissions from Scots pine shoots and stem, from soil and snow. Also VOC emissions from European Aspen are measured during summertime.
The PTR-QMS takes sample air from the sample line of gas-exchange measurement system and measures the concentration of about 10 atomic masses (resolution 1 atomic mass unit) in the sample air in about 10 second interval. During typical measurement day there is about 30 closures for the chamber located in trees, and 8 for those located to forest floor. Zero air measurements are conducted 8 times per day, about 10 minute period each time. The calibration is conducted using a separate calibration gas mixing unit, about 2-4 times per month.
Further information about device and its applications can be found from .