BOD / Toxicity Analysis

What BOD means and how it is measured.

The biological or biochemical oxygen demand indicates the amount of oxygen which is needed for the biological degradation of organic substances in water.

Generally, the BOD5 is perceived as the BOD for controlling waste water treatment plants (WWTP). However there are nitrification inhibitors added to the BOD5 to surpress the nitrogen degradation. Obviously, the nitrification is an important part of the biological degration of organics and thus is very important for the control of WWTPs. Consequently, the BOD5 ist poorly suited for the control of waste water treatment plants.

Alternatively, the total BOD is well-suited, due to the determination of the nitrogen as well as the carbonaceous part of biological degradation.

Read more about the online measurement of BOD.

What Toxicity is and how it is determined.

Toxicity is described as the direct harmful effect of a substance on organisms. These effects can already occur at low concentrations of toxic substances and are dependent on the incubation period and the dosage.

Some test methods that are available on the market can detect toxicity, but they do not however identify exactly which toxins are present. By using fish, daphnia, molluscs, algae or luminous bacteria, they simply test whether a water sample has a toxic effect.

Read more about online toxicity measurements.

LAR's BOD / Toxicity Analyzer


Online Toximeter

Related News for BOD and Toxicity Analysis

Types of Water: Industrial Waste Water


Parameters: TOC, DOC, TNb, COD


LAR's BioMonitor is an online BOD analyzer for the determination of the total biochemical oxygen demand (BOD). The analyzers' functional principle is similar to a miniature biological waste water treatment plant.


Toxicity is the most common disturbance to biological treatment processes – especially for nitrification. The continuous toxicity monitoring proactively protects the waste water treatment plant and hence, secures to keep the plant running.