No,we didnt have experience. At now, we look for possibilities how to do it. 

Vlasta probably you dont have the electrolytic enrichment system? I have not done membrane distillation ever but will appreciate Pauls guidance. utlost care is to be taken for your glassware as well.

we have found it too tideous we were usinf seawater and teh conc. were were low 0.15mBq - 0.3 mBq. 

are you going to use quantulus? or any other ultra low background LSC.

Dr. Miler please contact Dr. Kazimier Rozanski at the University of Krakow. He is expert in this field

Have looked at this article?

http://www.ans.org/pubs/journals/fst/a_12693

Iron anode with nickel cathode,1000ml-->10ml,~85% Recovery.reproducible,patch cell ,parallel.