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Prediction model of the buildup of volatile organic compounds on urban roads

Mahbub, Parvez, Goonetilleke, Ashantha, & Ayoko, Godwin A. (2011) Prediction model of the buildup of volatile organic compounds on urban roads. Environmental Science and Technology, 45(10), pp. 4453-4459.

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Abstract

A model to predict the buildup of mainly traffic-generated volatile organic compounds or VOCs (toluene, ethylbenzene, ortho-xylene, meta-xylene, and para-xylene) on urban road surfaces is presented. The model required three traffic parameters, namely average daily traffic (ADT), volume to capacity ratio (V/C), and surface texture depth (STD), and two chemical parameters, namely total suspended solid (TSS) and total organic carbon (TOC), as predictor variables. Principal component analysis and two phase factor analysis were performed to characterize the model calibration parameters. Traffic congestion was found to be the underlying cause of traffic-related VOC buildup on urban roads. The model calibration was optimized using orthogonal experimental design. Partial least squares regression was used for model prediction. It was found that a better optimized orthogonal design could be achieved by including the latent factors of the data matrix into the design. The model performed fairly accurately for three different land uses as well as five different particle size fractions. The relative prediction errors were 10–40% for the different size fractions and 28–40% for the different land uses while the coefficients of variation of the predicted intersite VOC concentrations were in the range of 25–45% for the different size fractions. Considering the sizes of the data matrices, these coefficients of variation were within the acceptable interlaboratory range for analytes at ppb concentration levels.

Impact and interest:

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4 citations in Web of Science®

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ID Code: 42043
Item Type: Journal Article
Keywords: traffic-generated volatile organic compounds, VOCs, average daily traffic (ADT), volume to capacity ratio (V/C), and surface texture depth (STD)
DOI: 10.1021/es200307x
ISSN: 0013-936X
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ENVIRONMENTAL ENGINEERING (090700)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2011 American Chemical Society
Deposited On: 21 Jun 2011 07:57
Last Modified: 02 May 2012 19:36

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