TY - JOUR
T1 - Investigation of non-target gas interferences on a multi-gas cavity ring-down spectrometer
AU - Garcia Perez, Pablo
AU - Støckler, Anna Holm
AU - Feilberg, Anders
AU - Kamp, Jesper Nørlem
PY - 2024/4
Y1 - 2024/4
N2 - Emissions from agriculture are a worldwide problem as it is the major anthropogenic source of ammonia, methane, and nitrous oxide. Several efforts have been made to mitigate emissions. To achieve this, reliable measuring techniques are necessary to quantify the impact of the emissions. Different techniques relying on different principles are available. Generally, these techniques demonstrate good agreement on their measurements but there is a lack of studies that thoroughly investigate cross-interferences. In this work, three different models of Cavity Ring-Down Spectrometers measuring ammonia, nitrous oxide, and methane were tested in parallel for potential biases due to interference from ammonia, water vapor, and twelve volatile organic compounds commonly present in agricultural environments. Our results showed a small negative bias with increasing humidity on nitrous oxide and minor interferences of ammonia on nitrous oxide and methane. None of the tested volatile organic compounds interfered with ammonia, methane, or nitrous oxide measurements. Overall, concentration measurements of ammonia, nitrous oxide, and methane with cavity ring-down spectrometry have proven reliable under typical agricultural conditions. Minor interferences were only observed under exceptional conditions.
AB - Emissions from agriculture are a worldwide problem as it is the major anthropogenic source of ammonia, methane, and nitrous oxide. Several efforts have been made to mitigate emissions. To achieve this, reliable measuring techniques are necessary to quantify the impact of the emissions. Different techniques relying on different principles are available. Generally, these techniques demonstrate good agreement on their measurements but there is a lack of studies that thoroughly investigate cross-interferences. In this work, three different models of Cavity Ring-Down Spectrometers measuring ammonia, nitrous oxide, and methane were tested in parallel for potential biases due to interference from ammonia, water vapor, and twelve volatile organic compounds commonly present in agricultural environments. Our results showed a small negative bias with increasing humidity on nitrous oxide and minor interferences of ammonia on nitrous oxide and methane. None of the tested volatile organic compounds interfered with ammonia, methane, or nitrous oxide measurements. Overall, concentration measurements of ammonia, nitrous oxide, and methane with cavity ring-down spectrometry have proven reliable under typical agricultural conditions. Minor interferences were only observed under exceptional conditions.
KW - Ammonia
KW - Analyzer
KW - CRDS
KW - Concentration measurements
KW - Methane
KW - Nitrous oxide
KW - Validation
UR - http://www.scopus.com/inward/record.url?scp=85190173552&partnerID=8YFLogxK
U2 - 10.1016/j.aeaoa.2024.100258
DO - 10.1016/j.aeaoa.2024.100258
M3 - Journal article
SN - 2590-1621
VL - 22
JO - Atmospheric Environment: X
JF - Atmospheric Environment: X
M1 - 100258
ER -