Granular sludge contains heavy particulate matter in which it is hard to take 1 ml of sample by pipette and dilute before digestion in chemical oxygen demand.
first, try to filter your samples and then
take 2 ml of sample and place in a small tube containing a digestion
solution of sulfuric acid and mercury. The methods is applicable to sample with a
COD concentration in a range of 0 - 150 mg/l.
try to read this paper at page 31:-
publications.lib.chalmers.se/records/fulltext/167193.pdf
kind regards,
For closed reflux measurement may be he cannot see the pink colour of digestion sample when he treated it with FAS so he will need to filter it after digestion also for that i advised him to filter his sample before digest it.
you could break the granular sludge using a blender and then proceed to dilute and then measure COD.
Thank you everyone. Yeah I should try using blender or homogenizer to homogenize the sample and then dilute the sample before total COD analysis.
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