Determination of NO2 and SO2 by Ion Chromatography in Ambient Air by Use of Membrane - Closed Palmes Tube

Several authors have investigated the diffusive sampler method for measuring NO2 and SO2 in ambient air. The two pollutants are either independently or simultaneously analysed using the diffusive sampler. Different types of diffusive samplers can be used e.g badge type, radial type or open-ended longitudinal diffusion tubes. The Palmes tube, coated with triethanolamine (TEA), allows the simultaneous determination of NO2 and SO2. However, field measurements showed that the open-ended diffusion tube is affected by a strong artefact on the SO2 determination arising from sulphate particulate matter. To avoid this interference, a teflon membrane has been introduced at the open end of the Palmes tube able to prevent contamination coming from the particulate matter. However the introduction of the membrane creates an additive resistance to the diffusion of molecules to the absorbent and therefore modifies the uptake rate of the Palmes tube. The evaluation of NO2 membrane-closed Palmes diffusion tubes (MCPTs) is already presented somewhere else . Hereafter, an evaluation of the modified Palmes sampler with a membrane for the determination of SO2 is presented.

BUZICA Daniela;  GERBOLES Michel; 

2008-07-04

Health and Safety Executive, CAR Committee (Committee of Analytical Requirements), Working Group 5

JRC41789

http://www.hsl.gov.uk/publications/issue16.pdf,    https://publications.jrc.ec.europa.eu/repository/handle/JRC41789,