Selenium dosing

[6272862829]

Hi Randy.
Could you help me with this calculation.
I’m trying to make a selenium a 1 liter solution that will have a concentration that will increase selenium by 2 ugl when dose at 1ml per 100L.
My source of selenium is 200 mcg capsules of L-selenomethionine.

 

[Randy Holmes-Farley]

This is a copy and paste from the diy archive for others reading this:

Selenomethionine (mw = 196 g/mole) is 40.3% selenium by weight.

1 g Selenomethionine /L is 40.3 mg Se/L = ppm.

If you dose 1 mL of that to 100 liters of aquarium volume, the boost is 0.0040 mg/L or 4.0 ppb Se.

 

[Randy Holmes-Farley]

Hi Randy.
Could you help me with this calculation.
I’m trying to make a selenium a 1 liter solution that will have a concentration that will increase selenium by 2 ugl when dose at 1ml per 100L.
My source of selenium is 200 mcg capsules of L-selenomethionine.

Can you clarify if that means 200 ug of selenium or 200 ug of selenethionine. I
Assume the former, but lets clarify first.

 

[6272862829]

Can you clarify if that means 200 ug of selenium or 200 ug of selenethionine. I
Assume the former, but lets clarify first.

they are 200mcg capsules of L-selenomethionine.

 

[Randy Holmes-Farley]

Ok, so each capsule contains 200 ug of selenium.

If you want to raise 100 L by 2 ug/L, you need 200 ug of selenium. Thus, exactly one capsule will do it, but I doubt you can dissolve it readily in one mL because of the other stuff in the capsule and the capsule
Itself.

 

[6272862829]

Ok, so each capsule contains 200 ug of selenium.

If you want to raise 100 L by 2 ug/L, you need 200 ug of selenium. Thus, exactly one capsule will do it, but I doubt you can dissolve it readily in one mL because of the other stuff in the capsule and the capsule
Itself.

I want to make a one liter solution that has a concentration that when dose at 1ml/100L will increase selenium by 2 ugl.

 

[6272862829]

If that does not work then could use the same mixture you provided above with this capsules. Mixing 1 gram of the power in these capsules per 1L of water

 

[Randy Holmes-Farley]

I want to make a one liter solution that has a concentration that when dose at 1ml/100L will increase selenium by 2 ugl.

As I indicated, you are unlikely to be able to accomplish that with those capsules. You’d need to dissolve a thousand in that liter.

 

[Randy Holmes-Farley]

If that does not work then could use the same mixture you provided above with this capsules. Mixing 1 gram of the power in these capsules per 1L of water

No. There is more stuff than selenomethionine in those capsules.

 

[6272862829]

No. There is more stuff than selenomethionine in those capsules.

Ok so if 200 ug/l is 0.2 ug/ml
And lets say I want a .02 ug/l daily dose

I could mix 8 capsules in 1 liter of water and dose 9.5 ml per day to maintain .02ug/l in a 379 liter tank ?

375 x 0.02 =7.58

7.58 / .8=9.475

 

[Randy Holmes-Farley]

Why not just buy the product in the diy recipe and use that?

 

[6272862829]

Why not just buy the product in the diy recipe and use that?

I can’t find it. You have a source?

 

[Randy Holmes-Farley]

There are liquid solutions:

Amazon.com

But if you dissolve 1 of your capsules in any amount of water and add it to 100 L, that will give the original needed boost.

 

[6272862829]

There are liquid solutions:

Amazon.com

But if you dissolve 1 of your capsules in any amount of water and add it to 100 L, that will give the original needed boost.

I don’t need it for 100l I was just trying to make a 1 liter solution that could relate to most of the avaliable reef bottled trace element solutions for reef tanks. Most are mixed with a dosing criteria of 1 ml will increase the aquarium value to .2 ugl per 100l. I did find powder form this place. What you think about this.

Your Shopping Cart

Browse our wide variety of over 600 premium ingredients, extracts, powders, vitamins, minerals, amino acids. etc. BoxNutra is the number 1 Us ingredients supplier, With the highest quality products and unmatchable prices.

boxnutra.com

 

[Randy Holmes-Farley]

The link is to a cart that is empty.

 

[6272862829]

The link is to a cart that is empty.

Sorry about that. Here is the powder I found but it only says .5%

 

[6272862829]

So if I mix 1 gram of the powder above in 1 liter of water it will only boost selenium by
0.002013 mg/l in 100 liters right ?

 

[Randy Holmes-Farley]

I don’t see anything about ingredients or potency in the posted picture.

 

[6272862829]

I don’t see anything about ingredients or potency in the posted picture.

it only has this. No ingredients chart or anything. Selenium seem kind of hard to find without fillers.

 

[6272862829]

Also just calke

I don’t see anything about ingredients or potency in the posted picture.

Also just called the company and they said is raw product. How can that be if it’s only .5 %. I thought Selenomethionine was 40.3 % by wheight.