CPSILColorado Plateau Stable Isotope Laboratory (Northern Arizona University, Flagstaff, AZ)
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The sample was analyzed on an Agilent Technologies Model 5890/5973 GC-MS system equipped with a CPsil 19CB capillary column [25 m x 0.25 mm (i.d.); film thickness, 0.2 [micro]m; Varian].
GC separation was achieved on a WCOT fused silica capillary column [25 m x 0.25 mm (i.d.)] coated with CPSil 19 CB, film thickness 0.25 [micro]m (Chrompack BV).