No, there are not any other cations, so I feel very strange. Everything brought from sigma.
On Tue, Feb 22, 2011 at 8:58 PM, William Scott <[email protected]> wrote: > What other cations are present? Any divalent cations like Mg++ or Ca++? > > The Ksp of magnesium phosphate is about 10^-24, so even if you have a very > small amount present, say as a contaminant with citrate or EDTA, it will > crystallize. > > On Feb 21, 2011, at 1:22 PM, Yibin Lin wrote: > > > Dear all, > > > > I got a lot of salt crystals in reservior solution (well solution), which > contains 0.1 M phosphate/citrate ph 4.2, PEG200 47%, EDTA-2Na 0-22mM. > Reservior solution appears crystals from 12mM EDTA. Could someone help me to > explain why? > > > > Thank you very much! > > > > Yibin > > > > William G. Scott > > Contact info: > http://chemistry.ucsc.edu/~wgscott/ > >
