Reading on precipitate of Iron and Phosphate...
I dosed KH2PO4 to pretty high ppm, and then on alternate day, I dosed Fluorish and Fluorish Iron... And I still get precipitate...
So what happens to the Fe(III)PO4 precipitate? Plants wun be able to use the PO4 and Fe already right? Since precipitate means insoluble (from secondary chemistry)...
from the chemistry point of view, as the concentration of Fe(III) and PO4 ions in your tank water decrease (consumed by your plants), the precipitate will redissolve and will then be available for the plants' use.
since you have already a precipitate, i think the best would be to reduce your PO4 dosing a little.
Precipitate means we get cloudy water is it?
No. Iron phosphate is pretty dense and will settle to the bottom.Originally Posted by AquaObsession
BC
Will the iron phosphate re-dissolve? Or just settle as solids in the bottom?
Iron phosphate has very low solubility in water. Therefore, insignificant amount of it will re-dissolve. Therefore, generally iron in iron phosphate is considered are not-available to the plants. But I think there are mechanisms where it can become available again, not through dissolving though.
Iron salts are generally not soluble. In fertilisers like Flourish, they are chelated. Even in the event of precipication, the plants would still can access the iron through other mechanism from the substrate.
BC
Last edited by bclee; 27th Feb 2006 at 11:06.
Can you describe what you did and what you saw? Why do you suspect that it is Iron phosphate that is precipitating?
BC
Did water change for my 13gal (2x1x1) on Sat, dosed KNO3 (~0.3teaspoon), KH2Po4 (~0.1teaspoon) and Seachem Equilibrium (~0.25 teaspoon).
One Sunday, dosed Fluorish (~5ml) and Fluorish iron (~3ml)... Next moment, I get cloudy water... So suspect to be precipate...
Sorry about giving everything in teaspoon... Dun have my Chuck's calculator in office...
Need additional info?
I found this:
http://www.seachem.com/support/FAQs/...hIron_faq.html
Hope that it is helpful.
BC
Thanks BC, come to think of it, I recently up my Equilibrium dosage... I might just have made my water too hard, as a result causing the precipatation... Cause I am seeing what was described in the FAQ...
I dose 2+ tablespoon of equilibrium for my 6x2x2. Profito trace 120ML every two days. NPK every two days. So far no cloudy water .
Did you dose Equilibrium? I believe is my Equilibrium causing the cloudiness? I based that on the faq which bclee provided... Seachem mentioned that Equilibrium could have caused the cloudiness... Which I sort of OD when I did water change recently...
Posting Permissions
Reply With Quote
Bookmarks