Product category:
Air Pollution Monitor and Control
News Release from: Metrohm UK | Subject: Marga
Edited by the Processingtalk Editorial
Team on 21 June 2007
Inorganic species in aerosols and
ambient air
MARGA measures the concentration of inorganic species in aerosols and their related gas phase components in ambient air
A mass flow controlled air-pump draws 1m3 ambient air per hour through the sampling box The size of particulate matter (PM) could be selected by placing special designed cyclones (PM 10 or PM 2.5um) before the entrance of the sampling box
This article was originally published on Processingtalk on 31 Jul 2006 at 8.00am (UK)
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In this box water soluble gases are quantitatively (more than 99,7%) absorbed in a wetted rotating denuder (WRD).
Based on the difference in diffusion velocity of aerosols and gases, the aerosols will pass the WRD and are trapped in the steam-jet-aerosol-collector (SJAC) which is connected to the WRD.
By steam injection a water supersaturated condition is created, forcing a water vapour condensation process.
By condensational growth aerosols are quantitatively (more than 99,7%) separated from the airstream in a cyclone.
The liquid streams from the WRD and SJAC are collected during exactly one hour in 25ml burettes located in the analytical box.
These samples are degassed and mixed with an internal standard and than controlled injected in anion and cation chromatographs.
The ion chromatograph sensitivity is sufficient to reach sub 0.1ug/m3 detection limits at a 1m3/h air sampling flow converted into a 25ml liquid sample volume.
For lower detection limits a so-called concentrator column could be applied.
The detection system is continuously controlled by an internal calibration, performed by the addition of a standard solution containing anions and cations normally not present in ambient . Request a free brochure from Metrohm UK ...
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