2017
DOI: 10.5194/amt-10-2253-2017
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Use of a heated graphite scrubber as a means of reducing interferences in UV-absorbance measurements of atmospheric ozone

Abstract: Abstract. A new solid-phase scrubber for use in conventional ozone (O 3 ) photometers was investigated as a means of reducing interferences from other UV-absorbing species and water vapor. It was found that when heated to 100-130 • C, a tubular graphite scrubber efficiently removed up to 500 ppb ozone and ozone monitors using the heated graphite scrubber were found to be less susceptible to interferences from water vapor, mercury vapor, and aromatic volatile organic compounds (VOCs) compared to conventional me… Show more

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Cited by 13 publications
(11 citation statements)
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“…Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is an established tool for the detection of trace gas species (Fiedler et al, 2003;Ball et al, 2004;Washenfelder et al, 2008) including O 3 (Darby et al, 2012;Gomez and Rosen, 2013). IBBCEAS relies on a broadband, incoherent light source coupled to a high-finesse optical cav-ity.…”
Section: Principle Of Operationmentioning
confidence: 99%
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“…Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is an established tool for the detection of trace gas species (Fiedler et al, 2003;Ball et al, 2004;Washenfelder et al, 2008) including O 3 (Darby et al, 2012;Gomez and Rosen, 2013). IBBCEAS relies on a broadband, incoherent light source coupled to a high-finesse optical cav-ity.…”
Section: Principle Of Operationmentioning
confidence: 99%
“…Attenuation of light intensity in an IBBCEAS cavity results from trace gas absorption as well as extinction due to the mirrors and Rayleigh scatter. Accounting for these additional losses, the Beer-Lambert absorption coefficient, α abs , is related to the observed change in intensity transmitted through the cavity as follows (Washenfelder et al, 2008):…”
Section: Principle Of Operationmentioning
confidence: 99%
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“…For ozone, the most common measurement method is by absorbance of the 253.7 nm line of a low-pressure mercury lamp. Here, co-absorbing interferences are small due to the large O 3 absorption cross section (e.g., Turnipseed et al, 2017). Atmospheric measurements are easily made because the required precision (low ppb) can be achieved with practical path lengths (l, Eq.…”
mentioning
confidence: 99%
“…Errors due to incomplete flushing of the detection cell between analyte and reference measurements of light intensity can result from reduced pumping efficiency. Incomplete scrubbing of ozone during the reference light intensity measurement, as well as adsorption/desorption of UV-absorbing species such as aromatic volatile organic compounds (VOCs) and elemental mercury from the ozone scrubber (Spicer et al, 2010;Turnipseed et al, 2017), and the effects of changing humidity levels on light transmission through the detection cell (Wilson and Birks, 2006) can all affect the photometer's linearity and offset. Ozone instruments based on other techniques such as electrochemical ozonesondes (Komhyr, 1969) or solid-phase or gas-phase chemiluminescence (Regener, 1964;Güsten et al, 1992) are also known to be sensitive to many variables that can induce systematic errors and often require even more frequent calibration checks.…”
Section: Introductionmentioning
confidence: 99%