EXTRACTION OF PORE WATER FROM MARINE-SEDIMENTS - A REVIEW OF POSSIBLE ARTIFACTS WITH PERTINENT EXAMPLES FROM THE NORTH-ATLANTIC

Great care must be taken in extracting pore water if results are to be reliable. Errors can arise by inadequate storage conditions prior to pore water extraction, by a difference between extraction temperature and the in situ temperature, by oxygen contamination and possibly by high squeezing pressures. Three different extraction methods have been applied to samples from 30 m long piston cores collected in two abyssal plains in the North Atlantic Ocean. The results demonstrate that all of the above mentioned errors have occurred. These errors are discussed ad examples are shown.