Posted: Apr 14, 2010 2:59 pm
by rainbow
Spearthrower wrote:
rainbow wrote:
Spearthrower wrote:
The resins produced by DOW are artificial zeolites which most certainly do occur naturally. The idea being that they are generally contaminated, and therefore not useful for control purposes.

International Zeolite Association, Database of Zeolite Structures, http://www.iza-structure.org/databases

Zeolites naturally form where volcanic rocks and ash layers meet alkaline groundwater.

Are you going to object to the natural presence of these 3 500 million years ago?

Wrong.
Dowex 50W is based on crosslinked polystyrene, not zeolites.
We have no evidence of naturally occurring polystyrene based ion exchangers.


Did I say it was 'based on zeolites'? - no, quite clearly I didn't. I said that they are artificial zeolites, as in, they take the place of zeolites as natural zeolites are potentially contaminated.

...not terribly 'pre-biotic' then.
Why would contamination be a problem?
Contamination with what exactly?
How did the Pre-Biotic world cope with contamination?

BTW How would the stepwise elution with increasing concentrations of hydrochloric acid have been achieved?