A method and apparatus for in-situ measurement of soluble contaminant flux rates from sediments in which an inverted desorption chamber containing a sorbent system is filled with water and placed over an area of sediment, whereby the interior of the chamber is isolated from the exterior of the chamber above the sediment. Soluble contaminants released from the sediment are sorbed onto the surface of a sorbent material disposed within a plurality of semipermeable membrane bags disposed within the chamber. Each semipermeable membrane bag is removed from the chamber in a pre-defined sequence over a period of time and the sorbent material in each bag is analyzed to determine an amount of the soluble contaminant sorbed by the sorbent material. From the results of the analyses, the mass of the soluble contaminant removed from the sediment over time can be calculated.
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