CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.
As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
i
Efficacy of Paired Electrochemical Sensors for Measuring Ozone Concentrations
-
2 2019
-
-
Source: J Occup Environ Hyg. 16(2):179-190
[PDF-853.09 KB]
Details:
-
Alternative Title:J Occup Environ Hyg
-
Personal Author:
-
Description:Typical low-cost electrochemical sensors for ozone (O|) are also highly responsive to nitrogen dioxide (NO|). Consequently, a single sensor's response to O| is indistinguishable from its response to NO|. Recently, a method for quantifying O| concentrations became commercially available (Alphasense Ltd., Essex, UK): collocating a pair of sensors, a typical oxidative gas sensor that responds to both O| and NO| (model OX-B431) and a second similar sensor that filters O| and responds only to NO| (model NO2-B43F). By pairing the two sensors, O| concentrations can be calculated. We calibrated samples of three NO2-B43F sensors and three OX-B431 sensors with NO| and O| exclusively and conducted mixture experiments over a range of 0-1.0 ppm NO| and 0-125 ppb O| to evaluate the ability of the paired sensors to quantify NO| and O| concentrations in mixture. Although the slopes of the response among our samples of three sensors of each type varied by as much as 37%, the individual response of the NO2-B43F sensors to NO| and OX-B431 sensors to NO| and O| were highly linear over the concentrations studied (R| ≥ 0.99). The NO2-B43F sensors responded minimally to O| gas with statistically non-significant slopes of response. In mixtures of NO| and O|, quantification of NO| was generally accurate with overestimates up to 29%, compared to O|, which was generally underestimated by as much as 187%. We observed changes in sensor baseline over 4 days of experiments equivalent to 34 ppb O|, prompting an alternate method of calculating concentrations by baseline-correcting sensor signal. The baseline-correction method resulted in underestimates of NO| up to 44% and decreases in the underestimation of O| up to 107% for O|. Both methods for calculating gas concentrations progressively underestimated O| concentrations as the ratio of NO| signal to O| signal increased. Our results suggest that paired NO2-B43F and OX-B431 sensors permit quantification of NO| and O| in mixture, but that O| concentration estimates are less accurate and precise than those for NO|.
-
Subjects:
-
Source:
-
Pubmed ID:30412037
-
Pubmed Central ID:PMC10494896
-
Document Type:
-
Funding:
-
Volume:16
-
Issue:2
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
