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ARS Home » Midwest Area » Ames, Iowa » National Laboratory for Agriculture and The Environment » Soil, Water & Air Resources Research » Research » Research Project #418117


Location: Soil, Water & Air Resources Research

2011 Annual Report

1a. Objectives (from AD-416)
The objectives of this proposed research are to: 1) Measure the emission rates/fluxes of particulate matter (PM), selected volatile organic compounds (VOCs), and GHGs from open-lot cattle feedlots in Kansas and 2) Characterize the chemical nature of particulate matter emitted from commercial cattle feedlots.

1b. Approach (from AD-416)
1) Measurement of the concentration profiles of PM10 and PM2.5 in a commercial feedyard - within facility and/or downwind edge of the facility. a) Quasi-continuous – tapered element oscillating microbalance (TEOMs); and b) Time-averaged – low-volume federal reference method (FRM) samplers. 2) Measurement of the concentration profiles of greenhouse gases (i.e., CO2, N2O, CH4) and selected VOCs (i.e., phenols) - within facility and/or edge-of- facility boundaries. a) Canisters – for GHGs; and b) Sorbent tubes – for selected VOCs. 3) Meteorological tower equipped with eddy covariance instrumentation to be set up within or on the downwind edge of the facility. a) 3-D sonic anemometer; b) Open-path CO2/H2O gas analyzer; and c) Temperature profile. 4) Characterization of particulates and partitioning of VOCs from PM as a function of particle size using Raman spectroscopy.

3. Progress Report
In 2011, we continued the in-life phase of the intensive field sampling program at a large cattle feedlot operation (40,000 head) in central Kansas monitoring the emissions of ammonia, greenhouse gases, and select VOCs. The largest obstacle to overcome has been the weather. In August 2010, high winds destroyed our sampling tower/platform, which took several months to rebuild. Tower sampling protocol was modified due to the challenges associated with calibrating four different INNOVA instruments and the observation that three heights were as reliable as four. The modified protocol included building a manifold system for monitoring three different heights; reducing the number of heights increased the dwelling time on each height by 33%. This year we traveled to the feedlot facility in November, March, May, June, and July, and plan one more sampling in middle/late September. Data is currently being analyzed.

4. Accomplishments