A squeezer for efficient extraction of pore water from small volumes of anoxic sediment1

A simple, small‐volume, low pressure, diaphragm‐type sediment squeezer made from inexpensive standard nylon stock material, suitable for trace metal studies, features a removable sediment cassette with prefilter which greatly facilitates loading and cleaning. Pore water is recovered rapidly through a large active area membrane filter without clogging, impermeable cake formation, or gas breakthrough. A minimal pore water dead volume significantly reduces flushing losses and facilitates online electrode measurements. The squeezer is designed to accept small quantities of unconsolidated sediment (20–100 ml) from refrigerated cores sectioned in a nitrogen‐filled glove box.