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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7">Hi John,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7">We try to go as high as possible in concentration, since the vbar is in the density difference between solution and solvent, so we try to make this as large
as possible. We have gotten “reasonable” (not to say accurate) values down to 0.5 mg/mL with the DMA5000, but it is really pain. Also, the concentration error becomes more significant at small solute/solvent density differences.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7">I should add, that our results were still getting better after months of regular/obsessive (well…) use of the instrument. Getting the knack of it wasn’t easy
nor quick.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7">Best of luck, Holger<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#3F31F7"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> John Sumida [mailto:jpsumida@gmail.com]
<br>
<b>Sent:</b> 30 September 2014 18:06<br>
<b>To:</b> HGSR (Holger Martin Strauss); rasmb@list.rasmb.org<br>
<b>Subject:</b> RE: [RASMB] Reproducibility in densitometry measurement<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue">Dear Holger,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue">Thank you for your detailed comments. Our experience with degassing the sample is consistent with yours: does not appear to make much of a difference. We have not tried removing
the syringe during measurement – Anton Paar rep recommended that we leave it in the plug during the sample measurement. We will try removing the syringe and see if that helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue">What concentration range to you normally use for your measurments?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue">Thank you for taking the time to consider my question.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue">John Sumida.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Courier New";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
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