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Comparison of trip average in-vehicle and exterior CO determinations by continuous and grab sampling using an electrochemical sensing method

Comparison of trip average in-vehicle and exterior CO determinations by continuous and grab sampling using an electrochemical sensing method
Comparison of trip average in-vehicle and exterior CO determinations by continuous and grab sampling using an electrochemical sensing method
In air quality monitoring studies, continuous sampling is capable of reflecting real time variation of gas levels, however, with a margin of uncertainty related to the response time of the sensor and to the speed of concentration fluctuation. In contrast, grab sampling allows the determination of average gas concentration over the whole sampling period eliminating thus the uncertainties associated with the continuous method. As studies of in-vehicle carbon monoxide (CO) exposure often show rapidly fluctuating CO levels and are increasingly using the continuous electrochemical sensing method, the present activity aims at validating the suitability of the latter method for this monitoring task. For this purpose, an electrochemical CO sensing monitor was used to continuously monitor CO level inside and outside of a vehicle moving in an urban area, and to analyze the content of concomitantly taken grab samples. Trip-average CO levels measured using the two testing methods were compared. For CO levels higher than the instrument detection limit (1 ppm), the observed percent difference between continuous and grab sampling results varied within a fairly acceptable range (0.6–15.4%). The regression of continuous sampling data against grab sampling data revealed an average error of 6.9%, indicating the suitability of the continuous electrochemical method for monitoring in-vehicle and exterior average CO concentration under typical urban traffic conditions.

carbon monoxide, continuous and grab sampling, electrochemical analysis
1352-2310
6087-6094
Abi Esber, L.
295d1572-a486-4388-91ea-cb997bd99d25
El Fadel, M.
e4238001-2af0-4f3a-b8a4-8b6ed3e1285f
Shihadeh, A
423cf953-7ac5-47a6-b8bd-4b0909c4b787
Abi Esber, L.
295d1572-a486-4388-91ea-cb997bd99d25
El Fadel, M.
e4238001-2af0-4f3a-b8a4-8b6ed3e1285f
Shihadeh, A
423cf953-7ac5-47a6-b8bd-4b0909c4b787

Abi Esber, L., El Fadel, M. and Shihadeh, A (2007) Comparison of trip average in-vehicle and exterior CO determinations by continuous and grab sampling using an electrochemical sensing method. Atmospheric Environment, 41 (28), 6087-6094. (doi:10.1016/j.atmosenv.2007.05.020).

Record type: Article

Abstract

In air quality monitoring studies, continuous sampling is capable of reflecting real time variation of gas levels, however, with a margin of uncertainty related to the response time of the sensor and to the speed of concentration fluctuation. In contrast, grab sampling allows the determination of average gas concentration over the whole sampling period eliminating thus the uncertainties associated with the continuous method. As studies of in-vehicle carbon monoxide (CO) exposure often show rapidly fluctuating CO levels and are increasingly using the continuous electrochemical sensing method, the present activity aims at validating the suitability of the latter method for this monitoring task. For this purpose, an electrochemical CO sensing monitor was used to continuously monitor CO level inside and outside of a vehicle moving in an urban area, and to analyze the content of concomitantly taken grab samples. Trip-average CO levels measured using the two testing methods were compared. For CO levels higher than the instrument detection limit (1 ppm), the observed percent difference between continuous and grab sampling results varied within a fairly acceptable range (0.6–15.4%). The regression of continuous sampling data against grab sampling data revealed an average error of 6.9%, indicating the suitability of the continuous electrochemical method for monitoring in-vehicle and exterior average CO concentration under typical urban traffic conditions.

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More information

Published date: 2007
Keywords: carbon monoxide, continuous and grab sampling, electrochemical analysis
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 188947
URI: http://eprints.soton.ac.uk/id/eprint/188947
ISSN: 1352-2310
PURE UUID: a1ad2828-ebc0-4a32-911b-a077366c4b8b

Catalogue record

Date deposited: 01 Jun 2011 09:24
Last modified: 14 Mar 2024 03:34

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Contributors

Author: L. Abi Esber
Author: M. El Fadel
Author: A Shihadeh

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