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In Brest, France, prior to the beginning of DSDP Leg 48, opportunity was taken to examine potential sources of geochemical sample contamination. Obvious problems associated with sampling operations, e.g., the cleanliness of core tubes, were discussed with shipboard personnel, and some procedural changes were made during the subsequent collection of Leg 48 material. During the leg, the shipboard geochemist also made a collection of various lubricants, greases, and other fluids that could be encountered during the normal procedures of sample collection and subsequent shipboard processing. Analysis of these samples was undertaken by a combination of column chromatographic separation procedures, followed by analysis of the fraction equivalent to the "saturate alkane content" by capillary column gas chromatography. The object of these analyses was not to obtain detailed compositional information on the various potential contaminants, but to provide a number of "fingerprint" chromatograms which could be used to access whether these materials were present in the samples examined.

Examination of Potential Geochemical Contaminants in Leg 48 Material