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 BOD measurement methods

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 Toxicity measurement methods

LAR's BOD / Toxicity Analyzer


Online Toximeter

Related News for BOD and Toxicity Analysis

The analyzer ToxAlarm is a measuring system for online toxicity monitoring as well as for laboratory use in drinking and surface water applications.


The toximeter NitriTox of LAR Process Analysers AG is a continuous operating analyzer for the determination of nitrification toxicity.


Types of Water: Water Effluent, Process Water, Industrial Waste Water


Parameters: TOC, TC, TNb