How to find the Biochemical Oxygen Demand BOD Using Winkler's Direct Method

[swapnarao]

one of the best video i have seen on BOD.

[eatandrepeatt]

Your video is very much helpful for me a ton 🙏🏼

[dexterdemver]

I think there are lots of loopholes in your procedure. When you add the chemicals, please consider the oxygen intake; hence dip the pipette below the water surface. Also, how much volume did you take that is needed and titrated with the thiosulfate?
might as well show your BOD calculations and chemical reactions of the process.

[ajaylawrence]

Very clear explanation brother... Keep going 💐

[adriantodorov]

You uncapped your water sample for quite an extended period of time before adding the manganese sulfate, this will allow oxygen in the room air to enter the sample and change the concentration. Also your water samples were evidently not filled to the top as when you add your reagents they should displace some liquid as you are adding in excess.

[irynjah]

You should get rid of the air bubble in your burette 😊

[kamallovelykhan]

Bhut hi jabardast tarike se bataya hai aapne

[maazsheikh]

I think now a days bod can be determined by hach bar coded kits or incubator based oxitop device as it requires very basic reagents and gives accurate results

[aswathyreji]

Addition of wrinkler solutions should be done deep under the water for proper mixing and fixation

[lapeteemnetaji]

If the expected BOD of a sample is in the range 35 mg/L to 85 mg/L, what would be the
minimum and maximum sample volumes to use for the sample dilution?

[파란멜빵]

Could I know the concentration of the chemicals that were used? And is starch solution starch in aqueous solution or starch indicator solution? I’m assuming it’s the first one

[thokalapudisubramanyam]

How can we determine the bod value from the titrated value

[austlinfebia]

what are the normality of solutions used

[PCLye]

Hi
if I have a digital DO meter
can I conduct a BOD5 by
...1st sample leaves for 5 days in the dark then take the DO reading
...2nd sample direct from the source - take the DO reading

then Subtracting the difference in value without going through the titration route?

[hanhphan]

Can you share with us the concentration of the reagent in this procedure?

[sidimohamedmestari]

Thx, it was good presentation but loud music didnt allow to hear well. Also it wd be much better if u provid explanation, ex ( why did u proceed without dilution!?, and if the dilution is required? How to detrmine the factors based on the detection limit of the method? Etc.
Thx

[saveearth]

What's difference between BOD3 and BOD5 except temperature??

[satishpanwar]

Sir in BOD bottle complete filled with waste water ..
Or waste water +distilled water
Plzz mention quantity of this sample....

[smac]

should have finished the experiment and calculated the BOD.

[wallindcoy]

Is the formula for calculating BOD correct? I'm a little confused because in some places I've read that BOD value = [DO(initial)- DO(final)]× Dilution factor.