The organic matter in the sample is affected by the microbial membrane and consumes a certain amount of oxygen, which reduces the oxygen diffused on the surface of the oxygen electrode.

When the organic matter in the sample diffuses to the bacterial membrane at a constant rate, the oxygen diffused to the surface of the oxygen electrode at this time also becomes constant, thus generating a constant current.

This converts the BOD in the sample.


Requirement:＜30mg/L