The chemical oxygen desire, ST-COD worth (ST = little scale sealed tube), of water as based on this dichromate approach could be regarded as an estimate with the theoretical oxygen demand, i.
It really is expressed as milligrams/liter or ppm. It truly is generally known as biological oxygen desire. You'll want to bear in mind BOD is surely an indicator and never a pollutant.
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It is necessary approach to Assessment the sewerage, industrial, effluent and intensive pollutant water. If a person liter of sample water consumes 100mg of oxygen to biodegrade of natural and organic matter, then the BOD is one hundred ppm. The BOD worth of consuming water
I happy to find out this method but I've an issue, if this parameters are checked in colorimetric approach for that reason it gives a certain value or range ?
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Use from the expression is often restricted to People water-bearing here formations able to yielding water in adequate amount to constitute a usable supply for folks's takes advantage of.
sample carbon to carbon dioxide by persulfate digestion. The carbon dioxide diffuses into a colored pH indicator Answer in which it is actually transformed to carbonic acid. The ensuing colour alter is directly proportional for the focus of carbon present from the sample.
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COD or Chemical Oxygen Desire is the total measurement of all chemical compounds (organics & in-organics) from the water / waste water;
Dr Kani is right. Connected is a website page from the Masters thesis which demonstrates the connection of measured values of BOD and COD. Take note the BOD value is near to zero when the COD price is around 50 since the BOD demonstrates only the dissolved organics although COD incorporates whole dissolved natural and organic and inorganic compounds.