Gilles
Member
- Joined
- 29 Mar 2011
- Messages
- 116
I have this wierd problem. I bought 2 different bags of monopotassium phosphate and made a pretty strong solution with it. (>10gr on 100ml water)
Both solutions don't measure any phosphates in it using both my PO4 profi test (drop test) and also not with my Hannah PO4 tester (digital).
What i've bought:
Bag 1:
Bag 2:
What i've tested:
First off all i've tested the solution i made; which reads 0.03ppm using the digital test from Hannah.
Then i tested my tank water, which reads 3ppm on the PO4 Profi test and 2.5ppm on the Hannah test (of which 2.5 is the max output)
Then i thought; if i add part of my solution to the aquarium water (e.g. 50/50 aquarium water and (strong) solution) it should read even higher values if the solution would contain any phosphates at all; or if it did not contain phosphates it would half the values. Wierd thing was, when doing this test, the PO4 profi test dropped to 0.2ppm and the digital one to 0.15ppm.
So.. what the hell is going on? Is the stuff i bought the wrong stuff or is it somehow buffering and needs to break down in the tank before it is 'measurable' ?
Both solutions don't measure any phosphates in it using both my PO4 profi test (drop test) and also not with my Hannah PO4 tester (digital).
What i've bought:
Bag 1:
Bag 2:
What i've tested:
First off all i've tested the solution i made; which reads 0.03ppm using the digital test from Hannah.
Then i tested my tank water, which reads 3ppm on the PO4 Profi test and 2.5ppm on the Hannah test (of which 2.5 is the max output)
Then i thought; if i add part of my solution to the aquarium water (e.g. 50/50 aquarium water and (strong) solution) it should read even higher values if the solution would contain any phosphates at all; or if it did not contain phosphates it would half the values. Wierd thing was, when doing this test, the PO4 profi test dropped to 0.2ppm and the digital one to 0.15ppm.
So.. what the hell is going on? Is the stuff i bought the wrong stuff or is it somehow buffering and needs to break down in the tank before it is 'measurable' ?