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Journal Article 
Volatile organic compounds: Comparison of two sample collection and preservation methods 
Liikala, TL; Olsen, KB; Teel, SS; Lanigan, DC 
Environmental Science and Technology
ISSN: 0013-936X
EISSN: 1520-5851 
BIOSIS COPYRIGHT: BIOL ABS. Two soil sample collection and preservation methods for volatile organic compounds, used during site characterization activities, were evaluated using standard U.S. Environmental Protection Agency analytical methods. A conventional bulk method recommends completely filling a sample container with soil; a less commonly used methanol method recommends placing a soil aliquot into methanol. Analytical results showed large negative biases associated with the bulk samples as compared to the methanol samples for aromatic compounds. Order of magnitude differences in concentrations measured between the methods were observed for benzene and toluene. Lesser differences were noted for xylenes and ethylbenzene. Limited data for chlorinated compounds suggest behavior similar to the aromatic species. A limited spike recovery study was conducted using the methanol method on laboratory and field samples. Samples were analyzed 82 days after spike addition. Poorer spike recoveries were no 
Methods; Biochemical Studies-General; Biophysics-Molecular Properties and Macromolecules; Soil Science-Physics and Chemistry (1970- ) 
• Methanol (Non-Cancer)
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