C

My BOD test result is 700 ppm what that mean

6 Answers
I do BOD test and this the first time i get this result, i am not sure if that write or not and i am sure all steps ate write if any one can help me with that.
W

Deionised water is typically much the same as distilled water. If made with an activated carbon polishing step and microfiltration DI water can be as near to pure H2O as you can get. If you are worried about micro-organisms in the DI water I would filter it through a 0.2 micron filter first. Or you can autoclave the water. Check the pH of both water samples (with a well washed electrode as there is very little buffering in these water samples). The DW can take up CO2 and become slightly acid because of the way it comes out of the condenser. But overall there is not much difference between the two sources of water.

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C

Appreciate your rosponse, usualy i used DI water to prepare the GGA, not DW what do you think about that i think if i used the DW will be better because no micro organisms in DW i think the DI effect my result becuase the micro organisms in DI water, please i need your idea about that.

Thank you and much appreciate.

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W

BOD is biological oxygen demand. Complete oxidation of the substances in the water sample by biological means (i.e. by micro-organisms) requires 700 mg/litre of oxygen, i.e. 700 ppm. The greater the BOD, the greater is the amount of stuff in the water that can be oxidised.

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S

Hi,
Well i could not comprehend much what you exactly asked but i do know what ppm stands for.
PPM stands for parts per million.
You got the result 700 PPM.So the quantity you are testing has 700 parts from 1 million parts of the other quantity.

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C

Appreciate your rosponse, usualy i used DI water to prepare the GGA, not DW what do think about that i think if i used the DW will be better because i think the DI effect my result, please i need your idea about that.

Thank you and much appreciate.

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C

Hi,
Thank you for your response,
What i want is that result make any sense , usualy my result always 2 or 3 or BDL less than 2 so i am confuse this time and i do not know if i did some thing wrong.

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