KH2PO4 not detected by Sera Phosphate Test Kit - The Planted Tank Forum
 
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post #1 of 2 (permalink) Old 12-20-2016, 07:39 AM Thread Starter
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KH2PO4 not detected by Sera Phosphate Test Kit

Hi guys,

I recently bought this KH2PO4 powder. I am trying to achieve 3PPM per 10ML of dosing. I found this calculator from Rotala Butterfly that looks very useful to get the right amount of KH2PO4 in a 500ML container for my 50 Gal tank. According to the calculator, to reach 3PPM every 10ML, i need to add 52.07 grams of KH2PO4 in a 500ML container; which I did.

Rotala Butterfly | Planted Aquarium Nutrient Dosing Calculator

However, I feel a bit dodgy in using the mix because when I did a test using the Sera Phosphate test kit, it found no phosphate in the mix. The result is clear as water.

TEST 1 - I put 10ML of mix in the test tube > add 6 drops of first bottle, shaked > 6 drops of second bottle, shaked > 1 pinch of the powder thing then mixed
RESULT - 0 Phosphate

TEST 2 - I added 5ML aquarium water then 5 ML of the mix in the test tube. Did the exact same step.
RESULT - 0 Phosphate


I mean i'd expected it to be dark blue or something due to the high about of phosphate in the tube.

I am sure the test kit is not expired as the bottom date says, 2018. Also, I tested it with AquaVitro Active P and I managed to get the blue color.

Your advice is highly appreciated.
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post #2 of 2 (permalink) Old 12-20-2016, 02:56 PM
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Concentrations well above the range of the rest kit can have some very very screwy results in test kits. I'm assuming that's what you are running into here. I would try dosing the tank, wait an hour or 2 and then test.


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