Is 3-point of H20 used for Kelvin a certain set of isotope

[swampwiz]

If I had had enough space to enter the proper question, it would have been:

Is the triple point of water which is used for the definition of the unit of Kelvin defined as water having a certain isotopes such as 2 Hydrogen-1 & 1 Oxygen-16?

Or would the error introduced by using different isotopes not make a difference up to the level of desired accuracy - or is there a defined occurrence of the various isotopes? It seems that the water that exists outside of the Earth could have a different isotope occurrence, and therefore presuming that water everywhere in the Universe has the same occurrence of the isotopes as on Earth would be a gaiocentric presumption.

 

[Bystander]

Google "Vienna Water."

 

[swampwiz]

Actually "Vienna Standard Mean Ocean Water". Searching for "Vienna Water" brings up the water works for Vienna, VA, LOL.

https://en.wikipedia.org/wiki/Vienna_Standard_Mean_Ocean_Water

So the definition does use a gaiocentric presumption. I suppose that it has to be this way.

 

[Vanadium 50]

nd therefore presuming that water everywhere in the Universe has the same occurrence of the isotopes as on Earth would be a gaiocentric presumption.

Why is this bad? (Especially as the Kelvin is about to be redefined)