Pore Water Extraction from the Sediment

In the following section, the separation of pore water from the sediment will be described. The necessary procedures will be described in the sequence in which they are employed. This is to 

In this context, the problem needs to be dealt with as to how long a tightly sealed core, which is exposed to the in situ temperature all the while, can be left to itself before it is processed withont the occurrence of any essential pertnrbation in the pore water fraction. In order to extract pore water from a sediment core, snch as is shown in Fignre 

and subsequently analyze and preserve it, even a practiced team wonld reqnire several days. In most cases, a compromise needs to be fonnd therefore, between the highest nnmber of samples and most rapid processing. 

For some substances dissolved in pore water everything will be too late for a reliable analysis as soon as the sediment core lies freshly, but in a decompressed state, on the deck of the ship. This holds true predominantly for the dissolved gases. 

In this respect, dissolved oxygen is relatively easy to manage, a circumstance which becomes evident upon comparing the in situ oxygen profile with the ex situ profile, both measured at the same 

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