Fast GC PID & FUV Detectors for Measurement of Greenhouse Gases in Livestock Barns

Assignment Status:	Assigned	Session Title:	Analytical Agricultural Applications (Half Session)
Session Date	03/17/2019	Starting Time:	03:05 PM ( Slot # 1 )

Authors: Driscoll and Maclachlan
Abstract:
Carbon dioxide, methane, and nitrous oxide are important greenhouse gases. In fact, methane is the second largest anthropogenic greenhouse gas (GHG), that contributes 14% of total anthropogenic GHG emissions estimated in 2004. Agricultural emissions of methane account for about 60% of the total methane from anthropogenic sources, of which 25% arises from fermentation in livestock. A considerable effort is underway to modify the diets of livestock to reduce methane emissions. A rapid analysis of these components is necessary to accurately measure these components. A considerable amount of ammonia is present and that should be measured.

One potential solution to this dilemma is to utilize fast GC columns with a low mass in a portable GC like the PID Analyzers Model GC312. What is a FAST GC column? There are several types: One approach involves using a 25m x 0.32 mm ID, 0.25µm film thickness that is resistively heated and can be programmed at a much higher rate than conventional ovens. It can also be cooled faster since it has a very small thermal mass. This is the approach that we have taken. The detectors used would be a Far UV Absorbance detector (FUV) for carbon dioxide, methane and nitrous oxide and a PID for measuring ammonia. A complete analysis of these gases can be done in about 3 minutes. This method will provide better detection limits and more accurate results than conventional spectroscopic methods.