Precautions for the use of BOD analyzer

Precautions for the use of BOD tester BOD is a relatively common water quality testing instrument at present.
There are many things to pay attention to in the process of use.
Let's follow the editor to increase knowledge
.

1.
Pre-estimate the BOD value of the sample to be tested.
If it cannot be estimated, it can be calculated by means of chemical oxygen demand (CODCr)
.

Generally, the amount of BOD is calculated according to the approximate concentration range of 70% of the chemical oxygen demand (CODCr)
.

According to the number of water samples and 8 culture flasks, select the number of parallel samples to be prepared
.

The water sample must be pretreated and its PH value should be around 7.
2
.

 　　⒉ If the CO2 absorbent enters the sample, the sample should be poured out and a new sample should be prepared
.

Note that each bottle is matched with the sealing cap and pipe, and the bottle cap cannot be screwed wrongly, otherwise the data will not correspond to the water sample in the bottle
.

 　　⒊If the rotor in the culture bottle does not rotate well, shake the bottle gently to make it rotate, but do not shake too much so that the CO2 absorbent enters the water sample
.

 　　4.
During normal measurement, the constant temperature waiting time cannot be less than 1 hour, nor can it be higher than 3 hours, otherwise the measurement result will be affected
.

When the ambient temperature is close to 20 °C, choose a constant temperature for 1 hour, and when the temperature difference from 20 °C is large, the constant temperature waiting time can be appropriately extended within the range
.

 　　5.
Data processing, the instrument can directly read the concentration according to the set sampling amount
.

The user only needs to take the average value of the parallel samples of the same sample to obtain the BOD value of this water sample
.

 　　6.
When cleaning culture flasks, sealed cups and rotors, use mechanical methods to remove dirt, and if conditions permit, use ultrasonic cleaners to clean
.

 　　The above is the relevant introduction about the key points of the use of the BOD tester.
I believe that everyone has a corresponding understanding of this after reading it.
You can use it as a reference and hope to be helpful to you
.