Submersible operated peepers for collecting pore water from deep-sea sediments

Sharmishtha Dattagupta, Guy Telesnicki, Kathryn Luley, Benjamin Predmore, Michael McGinley, Charles R. Fisher

Limnol. Oceanogr. Methods 5:263-268 (2007) | DOI: 10.4319/lom.2007.5.263

ABSTRACT: Peepers are a common alternative to push cores for collecting pore water from shallow aquatic environments such as lakes, streams and wetlands, but are infrequently used to sample deep-sea sediments due to design limitations. In this study, a peeper was developed to obtain pore water from precisely located positions on the deep-sea floor using remotely operated or manned submersibles. The sample cells of the peepers can be sealed closed after they are deoxygenated on board a ship, to ensure that they remain anoxic until peepers are deployed at the deep-sea sampling location. Similarly, peeper cells can be closed at the end of an incubation period to maintain sample integrity during submersible recovery and until sample processing. Each peeper can be used to collect samples from 10 cm above the sediment water interface and at 10 cm intervals down to 60 cm depth in the sediment, and can provide sufficient volume for multiple chemical analyses, including stable isotope ratio determinations.