Just curious what it means if I get a ph reading of 7.6 but after about 4-5 min in the tube its showing as 8.2?
pH test changes after a few mins?
- Thread starter skurys
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It means your PH is 7.6. The reading is correct for the first 30 seconds to a few minutes (the exact time varies) and after that it will often drift.
I have found that under conditions of FC greater than 10 ppm, and significant levels of CYA, the conversion of phenol red to chlorophenol red can happen, but at a delayed rate depending on the FC/CYA ratio. If the pH appears to go over 8.3 (purple), then this is the likely case.
If the FC is greater than 10 ppm, and there is no CYA, then the conversion happens almost instantly.
If the FC is below 10 ppm, then the sample pH can rise due to carbon dioxide offgassing.
Therefore, as Jason noted, the reading needs to be taken immediately.
What were the FC and CYA readings at the time?
If the FC is greater than 10 ppm, and there is no CYA, then the conversion happens almost instantly.
If the FC is below 10 ppm, then the sample pH can rise due to carbon dioxide offgassing.
Therefore, as Jason noted, the reading needs to be taken immediately.
What were the FC and CYA readings at the time?
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