Silicate, Phosphate, Dinos, and lanthanum chloride

[asome_one]

Hey all.

I learned today that dosing sodium silicate can cause issues with the hannah phosphate ULR checker. This is turn led to a conversation about previous issues I had while treating Dino's. I was heavily dosing sodium silicate at which time I noticed a spike in my phosphate. I began attempting to find a method to lower the phosphate without lowering the silica in the water. I was under the impression that lanthanum chloride would not remove the silica from the water. However, there is not much material to be referenced on the matter.
My previous thread
https://www.reef2reef.com/threads/clarification-about-dinos-and-phosphates.1085485/#post-13341534
Today I was given this article. From my understanding lanthanum reacts with the silicate and forms a precipitate.
https://www.sciencedirect.com/science/article/abs/pii/S0254058417302262This was given to me as evidence that one should not be dosing lanthanum while dosing silicate.

I am curious how significant the effect of lanthanum is reduced by silicate in the water. Would it be correct to assume that it would simply react with the silicate in the water before it begins to bind to phosphate? Or would it be that because phosphate is present in the water at greater volumes that it would bind with that first?
Or does it not really even matter and I'm just overthinking it.
I would think that so long as the doses of sodium silicate and lanthanum were spread out it wouldn't make much difference.
The only reason it mattered in my case was because I was attempting to remedy a high phosphate condition that I believed was affecting my corals.

 

[Randy Holmes-Farley Verified Community Expert]

I do not know how significant the interaction of lanthanum is with silicate. That paper is not useful evidence. In point of fact, lanthanum phosphate is thought to control the precipitation of lanthanum in the deep ocean, not lanthanum silicate.

https://www.reef2reef.com/threads/high-silica-interference-with-po4-measurement.777022/
The interference with the Hanna is low unless the amount of Si is added is very large and the phosphate is very low.

 

[asome_one]

I do not know how significant the interaction of lanthanum is with silicate. That paper is not useful evidence. In point of fact, lanthanum phosphate is thought to control the precipitation of lanthanum in the deep ocean, not lanthanum silicate.

https://www.reef2reef.com/threads/high-silica-interference-with-po4-measurement.777022/
The interference with the Hanna is low unless the amount of Si is added is very large and the phosphate is very low.

I appreciate the quick response.

I suppose If the need arrises in the future I will simply spread the doses out. Mixing the two in my systems had the intended effect eventually. Simply took more product than expected.

Thanks