Note: put the water in container first as NaOH + SDS will ppt!
Make up to required volume with dH2O
Keep at -20 C! but do not let freeze.
don't really know why this solution does not keep at room temperature - but it
If the freezer gets too
cold you can freeze solution III but that tends to separate the solution so that
you end up with frozen water on the top. This is caused by repeated freezing and
thawing. It thaws during the day when people open the freezer door often
and then re-freezes overnight. If you mix it really well before use it
should be fine.