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Diffusivity Sensor


Determine diffusivity of your sample

The diffusivity sensor enables you to calculate the diffusitivity of e.g. a sediment sample. The diffusivity is an important parameter to know in order to calculate the flux in a sample.

The principle of this sensor is illustrated in the figure below. A tracer gas coming from a gas reservoir inside the sensor is diffusing out of the sensor tip membrane. The tracer gas will diffuse away from the sensor tip with a specific rate depending on the type of sediment, e.g. in a high porous sediment the tracer gas will quickly diffuse away from the sensor tip. The diffusitivity rate is measured as the concentration of tracer gas around the microsensor tip.
Calibration of the diffusivity microsensor is carried out by mounting it vertically with the tip immersed in two different media with known porosity and diffusion coefficient.

Diffusitivity theory

Ordering Information

Standard Glass Sensor Outside tip diameter
DF-50 50-500 µm

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Pringault, Olivier et al (2001), Artificial cold-adapted microbial mats cultured from Antarctic lake samples. 2. Short-term temperature effects on oxygen turn-over, Aquatic Microbial Ecology, 127 - 138, vol. 26 Read abstract

Elberling, Bo et al (2001), Microscale measurements of oxygen diffusion and consumption in subaqueous sulfide tailings, Geochimica et Cosmochimica Acta, 1897 - 1905, vol. 65 Read abstract

Stief, Peter et al (2003), Temporal variation of nitrification rates in experimental freshwater sediments enriched with ammonia or nitrite, FEMS Microbiology Ecology, 63 - 71, vol. 46 Read abstract

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