Dear Madam/Sirs
I have a unknown sample to measure NO2-, PO4 3-, F and NH3.
The color was not removed by carbon active and filtration.
But when we add AlNO3 the sample color sediment.
Do you know any other solution for this problem?
Please try treatment with animal charcoal and filter the suspension...
You can use activated clay mixed with charcoal .. Its typical method for removing pigments and colors..
Did you tried with a centrifuge?
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