DEHP reference sample which, in turn, matches the samples of DEHP 
from Chem Service, Inc. The mass fragmentation patterns showed 
closely similar abundance profiles at m/z 61, 70, 71, 83, 104, 
112, 113, 149 (base), 150, 167, 168, and 279. 
Figure 11. Liquid chromatogram of Tenneco pond sediment. 
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