DIY Fluoride

[Randy Holmes-Farley]

Just want to double check the difference between sodium fluoride and potassium fluoride is not relevant for our use? If you have time would love to learn about the differences and why if so thank you.

The fluoride and its counterion (sodium or potassium) are not attached to each other in the liquid supplement bottle, and are not involved with one another in the tank, so it only comes down to adding sodium or potassium as both add ordinary F- ion.

The addition rate of fluoride is likely low enough that potassium elevation is not a big concern, but I see no reason to not use sodium fluoride unless you measured potassium and know it is low.

 

[Vested]

The fluoride and its counterion (sodium or potassium) are not attached to each other in the liquid supplement bottle, and are not involved with one another in the tank, so it only comes down to adding sodium or potassium as both add ordinary F- ion.

The addition rate of fluoride is likely low enough that potassium elevation is not a big concern, but I see no reason to not use sodium fluoride unless you measured potassium and know it is low.

Awesome thank you, extra cautious diying the elements because of it being in a 1g solution with all the others for captiv8. Appreciate your knowledge as always

 

[Randy Holmes-Farley]

Awesome thank you, extra cautious diying the elements because of it being in a 1g solution with all the others for captiv8. Appreciate your knowledge as always

You’re welcome. The reason it is high is because fluoride is a ppm level component of seawater while many trace elements we dose are ppb level components.

 

[Biff0rz]

To those of you mixing your own NaF, what PPE are you using? I want to do this but I also want to do it right.

 

[Isaac Alves]

The amount to can safely dose is up to NSW each time. If you don't know what that is on a daily basis, because you do not know the daily demand (if any), then I would not be able to suggest a dose.

The recipe I give there is

If you dissolve 10 grams in 1 L, then it is 10 mg/mL NaF and it takes 22 mL of that solution to boost 100 L by 1 mg/L F.

If you want to raise 200 gallons (757 L) by 0.7 mg/L (0.8 to 1.5 mg/L) then you will need 117 mL.

Out of curiosity, how long does 10 grams of sodium fluoride take to dissolve in 1l of RoDi water?

 

[Isaac Alves]

To those of you mixing your own NaF, what PPE are you using? I want to do this but I also want to do it right.

I used gloves, eye protection and a mask. I used a long lab spoon to pull the powder carefully onto the scale.

I hope that was enough

 

[Isaac Alves]

Out of curiosity, how long does 10 grams of sodium fluoride take to dissolve in 1l of RoDi water?

Hmmmm realize I’m stirring it up in a glass flask. Is that an issue with mixing? Thought I’d stir it up here then pour into an HDPE sealed bottle.