Articles online

UV-Absorption-Based Measurements of Ozone and Mercury: An Investigation on Their Mutual Interferences

Category: Articles

Volume: 6 | Issue: 4 | Pages: 418-429
DOI: 10.4209/aaqr.2006.08.0010
PDF | RIS | BibTeX

Ying Li, Sang-Rin Lee, Chang-Yu Wu

  • University of Florida, Department of Environmental Engineering Sciences, Gainesville, FL 32611, USA


Continuous mercury monitors (CMMs) have the advantage of performing real-time or near real-time measurement, although they are often vulnerable to measurement interferences. For example, CMMs based on atomic absorption spectrometry (AAS) are subject to interferences by components of the sample gas, such as ozone, if they happen to have strong absorption bands or lines overlapping the Hg absorption line. Studies on a selected commercially available CMM showed that 120 ppb of ozone could exert an interference of approximately 63 ng/m3 on Hg measurement. This interference may consequently affect the risk assessment of human exposure to Hg. On a similar basis, it was found that Hg can also result in significant interferences on an ozone analyzer based on UV absorption. Results showed that Hg at a concentration of 300 ng/m3 can potentially cause a bias in ozone measurement of approximately 35 ppb, comparable to the average ambient ozone concentration. It should be noted that interferences discussed in this paper are applicable only to UV-absorption-based Hg and ozone analyzers. It is also possible that certain models of such analyzers are not compromised by the reported interferences, and thus, the findings in this work should be considered as analyzer-specific.


Measurement interference Mercury Ozone UV adsorption Atomic adsorption spectroscopy

Related Article

Influence of Different Foreign Emissions Inventories on Simulated, Ground-Level Ozone in the Seoul Metropolitan Area during May 2014

Byeong-Uk Kim, Seunghee You, Hyun Cheol Kim, Yongjae Lim, Insuk Suh, Jae-Bum Lee, Jung-Hun Woo, Soontae Kim
Volume: 17 | Issue: 12 | Pages: 3179-3193
DOI: 10.4209/aaqr.2017.05.0165
PDF | Supplemental material

Critical Emissions from the Largest On-Road Transport Network in South Asia

Saroj Kumar Sahu , Gufran Beig, Neha Parkhi
Volume: 14 | Issue: 1 | Pages: 135-144
DOI: 10.4209/aaqr.2013.04.0137

Ambient Air Quality during Diwali Festival over Kolkata – A Mega-City in India

A. Chatterjee , C. Sarkar, A. Adak, U. Mukherjee, S.K. Ghosh, S. Raha
Volume: 13 | Issue: 3 | Pages: 1133-1144
DOI: 10.4209/aaqr.2012.03.0062