In situ H2S Production
In this exotic scientific application, the hydrogen sulfide outflow of "microvents" (rotten rootlets at vertical overhanging peatwalls of a mangrove island) was measured in order to investigate the formation of a symbiosis between stalked colonial ciliates and chemoautotrophic bacteria living on the colonial ciliates. Oxygen and hydrogen sulfide microprofiles were measured across the intact surface of the peat near the opening of a rootlet conduit and the measurements were repeated through the interface between the seawater and the opening of that conduit.
The hydrogen sulfide and oxygen sensors were mounted on a micromanipulator attached to an aluminum post that had been driven into the peat. The microsensors were connected to an underwater multimeter and the complete setup was operated by a scuba diver.