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Btloi89

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Be careful with fluoride. It can be fairly toxic.

NaF is 45% fluoride by weight, so to add 1 mg/L to 100 liters takes

(1 mg/L x 100 L ) / 0.45 = 222 mg, or 0.2 grams.

You can dissolve up to about 30 grams in a litter of RO/DI.

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.
Randy, Here's the math I'm working with for 1250L system:

(1mg/L x 1250) / 0.45 = 2,777mg or 2.78grams

If I dissolve 10 grams per 1L RODI, what is the math to boost 0.11 mg/L in a 1250L system?

Appreciate it!
 

KStatefan

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Randy, Here's the math I'm working with for 1250L system:

(1mg/L x 1250) / 0.45 = 2,777mg or 2.78grams

If I dissolve 10 grams per 1L RODI, what is the math to boost 0.11 mg/L in a 1250L system?

Appreciate it!

0.11 mg/L x 1250L = 137.5mg F 135.5 mg F /.45 = 305.5 mg NaF needed to contain 135.5 mg of F

0.3055 gram NaF/ 10 grams x 1000 ml = 30.55 ml of your solution needed to add 0.11 mg/L in 1250 L
 

Isaac Alves

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Use this calculator, pick the entry for potassium from potassium nitrate, and use 74% of the dosed amount (so 74 mL if it says 100 mL).

For my own curiosity:
  • Why do we need to use 74% of the directed dose amount calculated?
  • Why does the selection need to be ‘Potassium Nitrate’ for mixing up a solution of potassium chloride?
  • What is the ideal way to store the resulting potassium chloride solution?
Thank you
 

Randy Holmes-Farley

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For my own curiosity:
  • Why do we need to use 74% of the directed dose amount calculated?
  • Why does the selection need to be ‘Potassium Nitrate’ for mixing up a solution of potassium chloride?
  • What is the ideal way to store the resulting potassium chloride solution?
Thank you

Both. answers are the same: there is no entry for potassium from potassium chloride, but doing the math I suggests allows use of a different calculator entry.

Potassium chloride lasts forever in any sort of container. :)
 

Isaac Alves

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Be careful with fluoride. It can be fairly toxic.

NaF is 45% fluoride by weight, so to add 1 mg/L to 100 liters takes

(1 mg/L x 100 L ) / 0.45 = 222 mg, or 0.2 grams.

You can dissolve up to about 30 grams in a litter of RO/DI.

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.
How long does NaF take to dissolve in 1L of RODI?

And I used a glass flask on a stirrer, could that cause issues with mix time?

IMG_0471.jpeg
 

Randy Holmes-Farley

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I do not know how long it takes to dissolve NaF, but I would not have thought too long.

How much did you add? Did most dissolve?

If most dissolved and just a bit did not, that latter undissolved stuff may be impurities.

You used RO/DI, right, not tank water?

Glass should be OK.
 

Isaac Alves

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I do not know how long it takes to dissolve NaF, but I would not have thought too long.

How much did you add? Did most dissolve?

If most dissolved and just a bit did not, that latter undissolved stuff may be impurities.

You used RO/DI, right, not tank water?

Glass should be OK.
10g in 1L of RODI. I think most dissolved but it was still a lot of particulates swirling around after an hour of stirring.

I used Sodium Fluoride, Powder, Laboratory Grade, 100 g sourced from Carolina supply company.


1737556919793.jpeg
 

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