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Full-Text Articles in Engineering
Multidimensional Gas Chromatography-Olfactometry For Identification And Prioritization Of Malodors From Confined Animal Feeding Operations, Donald W. Wright, David K. Eaton, Lawrence T. Nielsen, Fred W. Kuhrt, Jacek A. Koziel, Jarett P. Spinhirne, David B. Parker
Multidimensional Gas Chromatography-Olfactometry For Identification And Prioritization Of Malodors From Confined Animal Feeding Operations, Donald W. Wright, David K. Eaton, Lawrence T. Nielsen, Fred W. Kuhrt, Jacek A. Koziel, Jarett P. Spinhirne, David B. Parker
Jacek A. Koziel
Odor profiling efforts were directed at applying to high-density livestock operations, some of the lessons learned in resolving past, highly diverse, odor-focused investigations in the consumer product industry. Multidimensional-GC-Olfactometry was utilized in an attempt to define and prioritize the basic building blocks of odor character associated with representative cattle feedyard and swine feeding operations. Although scores of potential odorant volatiles have been previously identified in high-density livestock operations, the odor profile results developed herein suggest that only a very few of these may constitute the preponderance of the odor complaints associated with these environments. This appeared to be especially true …
Evaluation Of Sample Recovery Of Malodorous Gases From Air Sampling Bags, Spme, And Sampling Canisters, Jacek A. Koziel, Jarett P. Spinhirne, Jenny D. Lloyd, David B. Parker, Donald W. Wright, David K. Eaton, Lawrence T. Nielsen
Evaluation Of Sample Recovery Of Malodorous Gases From Air Sampling Bags, Spme, And Sampling Canisters, Jacek A. Koziel, Jarett P. Spinhirne, Jenny D. Lloyd, David B. Parker, Donald W. Wright, David K. Eaton, Lawrence T. Nielsen
Jacek A. Koziel
Odorous gases associated with livestock operations are complex mixtures of hundreds if not thousands of compounds. Research is needed to know how best to sample and analyze these compounds. The main objective of this research was to compare recoveries of a standard gas mixture of 11 odorous compounds from the Carboxen/PDMS 75 µ m SPME fibers, PVF (Tedlar), FEP (Teflon), foil, and PET (Melinex) air sampling bags, and standard 6 L Stabilizer™ sampling canisters after sample storage at room temperature. A standard mixture consisted of 7 VFAs from acetic to hexanoic, and 4 semi-VOCs including p-cresol, indole, 4-ethylphenol, and 2'-aminoacetopheone …
Characterization Of Volatile Organic Compounds In Bovine Breath Using Solid-Phase Microextraction And Gas Chromatography-Mass Spectrometry, Jacek A. Koziel, Jarett P. Spinhirne, Norbert K. Chirase
Characterization Of Volatile Organic Compounds In Bovine Breath Using Solid-Phase Microextraction And Gas Chromatography-Mass Spectrometry, Jacek A. Koziel, Jarett P. Spinhirne, Norbert K. Chirase
Jacek A. Koziel
A face mask sampling device, DVB/Carboxen/PDMS 50/30 µ m solid phase microextraction (SPME) fibers, and a gas chromatograph with a mass spectrometer detector (GC-MS) were used for sampling and analysis of volatile organic compounds (VOCs) in bovine breath. Breath of 3 morbid steers with respiratory tract infections and 3 healthy steers were sampled 7 times in 19 days for 15 min at each sampling. A total of 21 VOCs were detected, many of them for the first time in cattle breath. Preliminary statistical analyses using Chi-square Test on the frequency of detection of each VOC in each group was performed. …
Screening For Volatile Fatty Acids In Agricultural Air Using Solid Phase Microextraction And Gas Chromatography – Mass Spectrometry, Jarett P. Spinhirne, Jacek A. Koziel, David B. Parker, Darren L. Williams, N. Andy Cole, John M. Sweeten
Screening For Volatile Fatty Acids In Agricultural Air Using Solid Phase Microextraction And Gas Chromatography – Mass Spectrometry, Jarett P. Spinhirne, Jacek A. Koziel, David B. Parker, Darren L. Williams, N. Andy Cole, John M. Sweeten
Jacek A. Koziel
Volatile fatty acids (VFAs) are a major component of odorous gases associated with agricultural sources. Because of typically low VFA air concentrations, conventional air sampling methods including sorbent tubes and vacuum canisters are often not sensitive enough to detect them. Solid phase microextraction (SPME) was used in this research because it is very sensitive, reusable, fast, and combines sampling and sample preparation, allowing for rapid detection of low concentrations of organics in air. This research focused on 7 VFAs: acetic, propionic, isobutyric, butyric, isovaleric, valeric, and hexanoic acids. Field experiments were conducted to test this method for air sampling of …
Noninvasive Sampling And Analysis Of Bovine Breath Using Solid-Phase Microextraction And Gas Chromatography-Mass Spectrometry: A Feasibility Study, Jacek A. Koziel, Jarett P. Spinhirne, Norbert K. Chirase
Noninvasive Sampling And Analysis Of Bovine Breath Using Solid-Phase Microextraction And Gas Chromatography-Mass Spectrometry: A Feasibility Study, Jacek A. Koziel, Jarett P. Spinhirne, Norbert K. Chirase
Jacek A. Koziel
An experiment was conducted to examine the feasibility of detecting unique volatile organic biomarkers exhaled by healthy and morbid heifer calves on-site using noninvasive sampling with solid phase microextraction (SPME) and analysis with gas chromatography-mass spectrometry (GC-MS). Two heifers were selected on the bases of health status and were sampled from 5 to 15 min with a special facemask sampling system using DVB/Carboxen/PDMS 50/30 µ m and PDMS 100 µ m SPME fibers. The samples were sealed and transported to the laboratory and analyzed with ion trap GC-MS. Acetone, methyl ethyl ketone, toluene, pentadecane, and nonanal were detected in cattle …