Vanadium pentoxide- need help from the big brains

[Randy Holmes-Farley]

Ok so ask them if it's anhydrous or its dihydrate yes?
If yes I ask and let you know

Yes.

 

[Randy Holmes-Farley]

That material looks fine.

It is 46% molybdenum by weight.

If you dissolve one gram in one liter of water, that gives a concentration of 460 mg/L or 0.46 mg/mL.

If you want to add 10 ug/L to a 100 L aquarium, you need 10 ug/L x 100 L = 1,000 ug or 1 mg.

Thus, 2 mL added to a 100 L aquarium will boost molybdenum by about 10 ug/L, which is close to the NSW level.

 

[AlbertGF]

Success! I ended up adding 1.8 grams of sodium hydroxide. 0.9 grams didn’t dissolve it completely.
Now I have vanadium supplement for life for $40. I’ll be giving about 80% of the vanadium pentoxide and sodium hydroxide powder away to my local fellow reefers.

Hi!
At the end which was you exact formula? I tried to dissolve 2.68gr. of V2O5 to 1.5 liters of RODI water and it is not dissolving. Following the instructions above I added 1.5gr. NaOH and still nothing.
I read at Wikipedia that it dissolves 8 grams per liter but in many other places they say that it dissolve at 0.8 grams per liter, so I don't know what to do...
Do you confirm that 4 grams dissolved well in 1 liter of water (after adding 1.8gr. NaOH)?

Thanks!

 

[Randy Holmes-Farley]

Hey mate how are u can you help me with DIY dose for
Nickel sulfate cas number 10101-97-0 dihydrate
Very appricate for help

Be very careful to not overdose nickel. It can be quite toxic.

Do you know the hydration state? or can you give a link or picture of the product label?

 

[Randy Holmes-Farley]

Do you have a scale and what sorts of masses (mg? g? more?) can it measure well?

 

[Randy Holmes-Farley]

OK, let's first make a dosing solution.

10101-97-0 is nickel sulfate hexahydrate (molecular weight 262.85 g/mole)

Nickel weighs 58.7 grams per mole.

Thus, the solid is 58.7/262.85 x 100% = 22.3% nickel by weight.

If we dissolve one gram of solid (= 223 mg nickel) in 1 L of RO/DI, it will contain 223 mg/L or 223 ug/mL

If you are detecting none by ICP, I think a reasonable dose is 0.5 ug/L

Thus to raise 100 L of seawater from 0 to 0.5 ug/L you need 50 ug of nickel, which is attained by dosing 0.22 mL (0.22 g) of dosing solution to the tank.

If that is hard for you to accurately measure, you can dilute the dosing solution by a factor of 10 by taking 100 mL and dilution with 900 mL of RO/DI. Then dose 10x the amount above, or 2.2 mL.

 

[Randy Holmes-Farley]

So need to dose 0.22ml per 100 liters right ?

If you have an ICP test that shows no nickel, that is what I would dose if I were to dose nickel. I'm not sure it will be useful, but it's a fine experiment.

Without an ICP test before dosing, I would not dose it.

 

[Randy Holmes-Farley]

The doses 0.22ml is per 100 liters ?

Yes.

 

[Randy Holmes-Farley]

I already did the calculations for 10 ug/L in the quote above.

Use 1/10th of the amount if you want to dose 1 ug/L.

"Thus, 2 mL added to a 100 L aquarium will boost molybdenum by about 10 ug/L, which is close to the NSW level."

To dose 1 ug/L, use 0.2 mL of the fluid above dosed to 100 L of aquarium water.

 

[Randy Holmes-Farley]

Thank you

You're welcome.

Happy Reefing.

 

[Randy Holmes-Farley]

Hey mate could you please tell me how dissolve sodium bentonite I try dissolve him it not dissolve for 100% maybe I can add some chemical to help him dissolved ?
Like sodium hydroxide ?
Thanks for advanced

Bentonite is a clay.

Why are you trying to dissolve it?

Surely you do not intend to dose it to an aquarium?

 

[Randy Holmes-Farley]

I'm at a loss to understand why you would want to dose it.

Sodium bentonite contains aluminum, sodium, and silicate.

I do not recommend dosing it. It is hard to dissolve and contains aluminum. There's never a reason to add aluminum to a reef tank (unless you are doing some sort of toxicity testing; in that case, use aluminum trichloride).

If you want to dose silicate, use sodium silicate solution.

 

[Randy Holmes-Farley]

I read that is help remove organic , and algae

I wouldn't add it, and am skeptical of the claim relating to algae, but organics may bind to the surface of the particles that you wouldn't want to dissolve, just suspend.

Sort of like adding fine calcium carbonate powder for this purpose.

 

[Randy Holmes-Farley]

Calcium carbonate do same purpose remove organics ?

Yes, but I'm not sure it is as useful as using GAC.

Some people do it as a DIY coral snow.

 

[Randy Holmes-Farley]

And you now dose diy of this chemical ?

I never dosed fine particulate calcium carbonate except when doing an experiment for an article. I did not see a reason to do it.

I used GAC (granular activated carbon) always.

 

[Texasnanoreef345]

Great, I'm glad that worked out.

Randy I have a question and I don’t know who else to ask or how to research it I see the old vanadium from triton was yellow but now it’s blue ? Would you still use sodium orthovanadate and create a yellow solution ? Or is there something different triton uses today that causes it to oxidize or turn blue not sure but would love to hear your opinion !

 

[Randy Holmes-Farley]

Vanadium changes color as it changes oxidation state.

The normal oxidation state of vanadium in seawater is +5, which is usually yellow. Blue is +4.

Not sure why they elect blue. Cheaper? More stable? I do not know if it makes a difference.

 

[salty joe]

Can I use kalkwasser instead of sodium hydroxide to dissolve vanadium pentoxide?

 

[Randy Holmes-Farley]

Can I use kalkwasser instead of sodium hydroxide to dissolve vanadium pentoxide?

You may need to add extra calcium hydroxide, but that should be ok.

 

[salty joe]

Thank you!