what does ultrafilterable mean? example non-ultrafilterable magnesium thanks

At a semi-educated guess from a very brief Google search, I think it refers to something that is easily filtered by physiological systems. I'm not 100% on that though, since it's not really a chemistry term.

In the case of unfilterable magnesium it is defined as magnesium ions or magnesium in complex with sugars or phosphate.

 

Link

Some nanoparticle solutions can't be filtered by traditional means. They'll either conglomerate and fall out of the colloidal phase our slip right through the filter.

 

Could this be what you are talking about?

so in the laboratory, is there something called an ultrafilter? or something that performs this kind of task?

Edited October 29, 201114 yr by kellbrook

what does ultrafilterable mean? example non-ultrafilterable magnesium thanks

so in the laboratory, is there something called an ultrafilter? or something that performs this kind of task?

Yes, the process is ultrafiltration. abbreviated "UF". You'll often see it mentioned together with diafiltration, abbreviated "DF", or together as "UF/DF" (say "uff duff"). I never worked with it myself, but I've had coworkers who did. Wikipedia can probably tell you more about it than I can.

A mathematicians revenge (on the chemist who once presented me a chart containing nothing but chicken wire structures -- but you will do as a proxy):

 

http://en.wikipedia.org/wiki/Ultrafilter

Oh. Utrafilterable! I stupidly read "unfilterable". Disregard my hastily posted comment above.