. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 160 Figure 25-la. Location of southeastern Bering Sea stations. Leg III, and with modified aluminum Van Veen grab sampler (Soutar 1976) in the 1976 and 1977 cruises of the R/V Sea Sounder. About 20 sediment samples, including two box-core samples, were collected in the summer 1979 cruise of the Discoverer. Care was taken during sampling to avoid contamination from the sampler or the ship. Except for a hinge in the sampler that could not be easily cleaned, all materials that came in conta
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 160 Figure 25-la. Location of southeastern Bering Sea stations. Leg III, and with modified aluminum Van Veen grab sampler (Soutar 1976) in the 1976 and 1977 cruises of the R/V Sea Sounder. About 20 sediment samples, including two box-core samples, were collected in the summer 1979 cruise of the Discoverer. Care was taken during sampling to avoid contamination from the sampler or the ship. Except for a hinge in the sampler that could not be easily cleaned, all materials that came in contact with the sediment were cleaned and rinsed with organic solvents. Sediments were placed in prewashed glass jars and frozen until analy- sis. Carbon and sulfur analysis Elemental analysis of sulfur was carried out on freeze-dried sediment samples combusted in a LECO (Laboratory Equipment Corporation) Model No. 523 induction furnace and the resulting sulfur gases were titrated according to ASTM procedure E30-47, using a LECO Model No. 517 titrator. Total carbon and organic carbon (carbon remaining after treatment with 3N HCl) were determined by combustion of dry sediment samples in a LECO Model No. 572-100 semiautomatic, acid-base carbon determinator. De- tails of these procedures are given in the pertinent instruction manuals of LECO. Extraction of hydrocarbons The frozen sediment (southeastern Bering Sea) was placed in precleaned cellulose extraction thimbles and washed with distilled water to remove salts. The wet sediment was freeze-dried for 48 hours and extracted in a Soxhlet extractor for 100 hours with toluene: methanol (3:7) with one solvent change after 24 hours. Hexane extract of the water wash was com- bined with these extracts, reduced to a small volume on a rotary evaporator at 38 C, and treated with activated copper to remove sulfur (MacLeod et al. 1976). The extract was saponified by refluxing for four hours with N KOH in a 1:1 mixture of water and methanol;
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