Infrared photoacoustic spectroscopy in animal houses: Effect of non-compensated interferences on ammonia, nitrous oxide and methane air concentrations

摘要: Reduction of ammonia and greenhouse gas emissions is a major goal in countries where the livestock sector has high social economic importance. Estimates per building annum usually have uncertainties higher than reduction targets. Therefore, mitigation strategies public funding efficiency will benefit from progress standardisation measuring modelling buildings. Quantification requires accurate measurements trace concentrations. Infrared photoacoustic spectroscopy been used for decades because its selectivity, reduced drift calibration, existence industrial analysers ease use cost measurement. Its can be further improved through better knowledge measurement uncertainty. Although infrared bands selected by optical filters are narrow, risk interference bias exists due to number diversity species. The emitted gases depend on management animals, feed, manure, heating motorised equipment. Non-compensated interferences between induce an overestimation concentrations, cascade effect induces underestimation. This study demonstrates two examples broiler dairy cow buildings, which lead either (e.g. 12 instead 2 mg [NH3] m−3 4 1 mg [N2O] or underestimation 2 4 mg [CH4] m−3). detection uncertainty concentration discussed. These results provide estimates previously published emission factors that were based spectroscopy.