About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 40 No. 1, p. 28-36
     
    Received: July 1, 2010
    Published: Jan, 2011


    * Corresponding author(s): fmmitloehner@ucdavis.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2010.0302

Identification and Quantitation of Volatile Organic Compounds Emitted from Dairy Silages and Other Feedstuffs

  1. Irina L. Malkinaab,
  2. Anuj Kumarc,
  3. Peter G. Greend and
  4. Frank M. Mitloehner *a
  1. a Dep. of Animal Science, Univ. of California, One Shields Ave., Davis, CA 95616
    b current address: California Air Resources Board, 1001 “I” St., P.O. Box 2815, Sacramento, CA 95812
    c Crocker Nuclear Lab., University of California, One Shields Ave., Davis, CA 95616
    d Dep. of Civil and Environmental Engineering, Univ. of California, One Shields Ave., Davis, CA 95616. Assigned to Associate Editor Rod Venterea

Abstract

High ground-level ozone continues to be an important human, animal, and plant health impediment in the United States and especially in California's San Joaquin Valley (SJV). According to California state and regional air quality agencies, dairies are one of the major sources of volatile organic compounds (VOCs) in the SJV. A number of recently conducted studies reported emissions data from different dairy sources. However, limited data are currently available for silage and other feed storages on dairies, which could potentially contribute to ozone formation. Because the impact of different VOCs on ozone formation varies significantly from one molecular species to another, detailed characterization of VOC emissions is essential to include all the important contributors to atmospheric chemistry and especially atmospheric reactivity. The present research study identifies and quantifies the VOCs emitted from various silages and other feedstuffs. Experiments were conducted in an environmental chamber under controlled conditions. Almost 80 VOCs were identified and quantified from corn (Zea mays L.), alfalfa (Medicago sativa L.), and cereal (wheat [Triticum aestivum L.] and oat [Avena sativa L.] grains) silages, total mixed ration (TMR), almond (Amygdalus communis L.) shells and hulls using gas chromatography–mass spectrometry and high performance liquid chromatography. The results revealed high concentrations of emitted alcohols and other oxygenated species. Lower concentrations of highly reactive alkenes and aldehydes were also detected. Additional quantitation and monitoring of these emissions are essential for assessment of and response to the specific needs of the regional air quality in the SJV.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2011. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America