UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF GEOLOGICAL SCIENCES
Benthic flux chambers work according to a simple principle. Reactions taking place between sediment particles, pore waters, and the overlying water can be monitored by isolating a small volume of bottom water and observing the change in chemistry of this water with time. Benthic flux chambers are instruments that isolate bottom water in contact with the sediment and either monitor the chemistry of this water using sensors or collect subsamples of this water for subsequent chemical determination. In either case, a flux, or the rate of exchange of a substance between the sediment and overlying water, is determined by calculating the rate of change of species concentration within the chamber. It is very important that the flux chamber materials provide neither a source nor sink for the chemical species measured this is especially important for oxygen flux measurements.
This article is from 'Proceedings of the US Army Corps of Engineers Workshop on Sediment Oxygen Demand Held in Providence, Rhode Island on 21-22 August 1990,' AD-A253 650, p153-167.