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Chemical and Carbon-13 Cross-Polarization Magic-Angle Spinning Nuclear Magnetic Resonance Characterization of Logyard Fines from British Columbia

^a Pacific Forestry Centre, Natural Resources Canada, 506 West Burnside Road, Victoria, BC, Canada V8Z 1M5
^b Forest Engineering Research Institute of Canada, 2601 East Mall, Vancouver, BC, Canada V6T 1Z4

View larger version (14K): [in a new window]   Fig. 1. Solid-state 13C nuclear magnetic resonance spectra with cross-polarization magic-angle spinning (CPMAS NMR) of (a) heartwood and (b) bark from the mid-section of a Douglas-fir stem and (c) weathered Douglas-fir bark from a roadside log handling site. Lower spectra are with dipolar-dephasing and total suppression of sidebands (DD–TOSS).

View larger version (28K): [in a new window]   Fig. 2. Solid-state 13C nuclear magnetic resonance spectra with cross-polarization magic-angle spinning (CPMAS NMR) representing three of the five categories of (a, c, e) 3- to 13- and (b, d, f) <3-mm fines from the Lavington logyard. Lower spectra are with dipolar-dephasing (DD) or with dipolar-dephasing and total suppression of sidebands (DD–TOSS) as indicated.

View larger version (35K): [in a new window]   Fig. 3. Solid-state 13C nuclear magnetic resonance spectra with cross-polarization magic-angle spinning (CPMAS NMR) of <16-mm trommel screen fines from (a) Alberni and (c) Lavington and (b) and (d) corresponding aqueous extracts. Lower spectra are with dipolar-dephasing (DD) or with dipolar-dephasing and total suppression of sidebands (DD–TOSS) as indicated.