Depletion/respiration measurement with OxiTop® Control OC 110

The investigation and monitoring of biological cleaning treatment processes are becoming more and more important with respect to the environmental requirements such as wastewater treatment, soil remediation and waste treatment.

Biological tests are often in the foreground as well as the usual physicalchemical measuring methods. In order to determine the biodegradability of foodstuffs, pollutants, harmful substances or waste substances and the microbial activity so-called respiration (depletion) measurements are often carried out. In these measurements the respiration of the organisms is determined under defined conditions as the oxygen uptake or release of carbon dioxide.

Measurements are carried out via closed systems using the OxiTop®-C in combination with the OC 110 controller. Depending on the field of use, specially adapted measuring vessels, which are all equipped with the necessary connection thread and some of which are autoclavable, come into operation. For this task there are various complete packages available which come equipped with all required utensils.

For the incubation of larger measuring vessels, WTW offers the TS 1006-i thermostatcabinet as well as the IS 6-VAR stirrer platform, which has been specially designed for vessels with large base diameter.

Measuring

Applications and Procedures

Soil respiration

Soil analysis/biodegradability of pollutants: laboratory method according to DIN 19 737

Aerobic using CO2 absorption, quantitative CO2 determination possible

Biodegradability

Determination according to OECD 301 F / DIN EN 29 408 / ISO 9408

Aerobic using CO2 absorption

Biogas determination

Determination of anaerobic degradation processes

Anaerobic, determination of CO2 + Methane

Microbiology

Growth and stress investigations: determination of the respiration rate

Aerobic, warning pressure possible