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<DIV><FONT face=Arial size=2>Dear colleauges, dear Joris
Beld,</FONT></DIV>
<DIV><FONT face=Arial size=2>you are absolute right in
your sinking to respect the Lambert- Beer low</FONT></DIV>
<DIV><FONT face=Arial size=2>in case of SE, not to enter
in the optical non-ideal concentration region . </FONT></DIV>
<DIV><FONT face=Arial size=2>You should give/define in
this case for the readers of your
mail the conc. in mgmL or in OD at the </FONT></DIV>
<DIV><FONT face=Arial size=2>wavelenght you or the colleague
intended</FONT> <FONT face=Arial size=2>to work !!!. At least if
you work with a thin cell of 3mm (available to buy ), it
is as you delute 4 X your solution. To proof
non ideality /crowding you have to run the
sample</FONT></DIV>
<DIV><FONT face=Arial size=2>at various concentrations and if your
graph of Mw versus conc. descends strongly you know what
is the maximal conc. you could
use,,,yours...ariel</FONT></DIV></BODY></HTML>