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Comparison of occupational and environmental exposures at Colorado dairies

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dc.contributor.authorLester, Bradley Raymond, author
dc.contributor.authorReynolds, Stephen J., advisor
dc.date.accessioned2024-03-13T20:12:23Z
dc.date.available2024-03-13T20:12:23Z
dc.date.issued2008
dc.description.abstractOccupational contaminant levels and environmental emissions were compared at two Colorado dairies. Along with meteorological conditions, analytes measured included odor, hydrogen sulfide, ammonia, total and inhalable particulate and endotoxin, and bioaerosols including fungi, mesophilic bacteria, and gram-negative bacteria. Meteorologic conditions varied widely in temperature (range: -12.5 - 4 1.1°C), relative humidity (range: 0.6 - 92.3%) and wind speeds during sampling (range: 0.48 - 8.66 m/s). Geometric mean bioaerosol concentrations for the Anderson sampler and SKC Biosampler include: mesophilic bacteria, 1282 and 383 CFU/m3, gram-negative bacteria, 667 and 265 CFU/m 3, and fungi, 781 and 252 CFU/m3. The Anderson sampler collected significantly (p<0.001) higher bioaerosol concentrations for all three categories. Peak ammonia levels at the study and control dairies ranged from 2.0 - 142 and 2.0 - 23 ppm. Peak ammonia was significantly (p<0.05) higher at the study dairy. Mean hydrogen sulfide levels at the study and control dairies ranged from 4.0 - 394 and 4.0 - 890 ppb. Peak hydrogen sulfide levels at the study and control dairies ranged from 37 - 17,000 and 210 - 5,200 ppb. Mean peak hydrogen sulfide was significantly (p<0.05) higher at the control dairy. Odor measures ranged from 0-15 D/T at both dairies. Inhalable particulate at study and control dairy lagoons ranged from < LOD - 2.3 mg/m3. Inhalable endotoxin at study and control dairy lagoons ranged from 2.1 - 487.2 EU/m3. Total particulate at study and control dairy lagoons ranged from < LOD to 2.4 mg/m3. Total endotoxin at study and control lagoons ranged from 2.5 - 6587 EU/m3. Inhalable particulate for tasks at both dairies ranged from 0.06 - 8.0 mg/m3. Total particulate for tasks at both dairies ranged from 0.03 - 6.9 mg/m 3. Inhalable endotoxin for tasks at both dairies ranged from 2.0 - 11096 EU/m3. Total endotoxin for tasks at both dairies ranged from 5.9 - 6758 EU/m3. Supported by NIOSH Grant 5U500H008085.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.identifierETDF_Lester_2008_3321292.pdf
dc.identifier.urihttps://hdl.handle.net/10217/237844
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.rights.licensePer the terms of a contractual agreement, all use of this item is limited to the non-commercial use of Colorado State University and its authorized users.
dc.subjectagriculture
dc.subjectColorado
dc.subjectdairies
dc.subjectemissions
dc.subjectenvironmental exposure
dc.subjecthydrogen sulfide
dc.subjectoccupational exposure
dc.subjectodor
dc.subjectagriculture
dc.titleComparison of occupational and environmental exposures at Colorado dairies
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineEnvironmental and Radiological Health Sciences
thesis.degree.grantorColorado State University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)

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