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<p class="MsoNormal"><span style="color:#1F497D">Hi Tonya,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Yes, I used to have to decant and re-pour a dozen times to get the solution evenly mixed. Hardly ideal.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Now we decant 70% ethanol from two 50 litre carboys on a trolley. The alcohol is pumped in first, then the water added as the pressure seems to get it right to the bottom. Then the home-made tool (we call the
‘super swizzler’) is plunged up & down several times to ensure everything is thoroughly mixed. The ‘wings’ are made of plastic cut from n icecream container
</span><span style="font-family:Wingdings;color:#1F497D">J</span><span style="color:#1F497D">, and flex to get past the narrow mouth. The concentration is then checked and so far it seems to work.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The larger black one for mixing alcohol in our 250 & 500 l tanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sometimes a home-made solution works just fine.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Ngâ mihi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Andrew Stewart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-NZ">>><<<)o><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-NZ">Assistant Curator NE (Fishes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-NZ">Museum of New Zealand<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-NZ">04 381 7314<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-NZ">027 7339363<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D;mso-fareast-language:EN-NZ"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-NZ">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-NZ"> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu>
<b>On Behalf Of </b>Haff, Tonya (NCMI, Crace)<br>
<b>Sent:</b> Wednesday, 7 September 2022 1:40 PM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] Mixing EtOH<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-AU">Hello all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">I have a question about mixing storage strength (70%) undenatured EtOH. Typically we add the correct proportions of 95% EtOH and water to a container and paddle or invert the container repeatedly to mix the liquids, and
allow it to sit for ~24+ hrs. The containers we like best to use for dispensing 70% EtOH are 20L plastic water containers with a tap at the bottom. Recently we used our digital alcohol meter to test the alcohol concentration from the top and bottom (tap) of
one of these containers and found the alcohol concentrations wildly different - ~80% at the top and ~60% at the bottom – despite having been mixed more than 24 hours earlier. This makes me really concerned that we could be regularly using concentrations that
are much above 70% with specimens. I wonder if any of you have had a similar problem, or if anyone can suggest a solution? Is there a better way of mixing or of ensuring the solution is properly combined? Any thoughts appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Thank you!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU">Tonya<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU">-------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU">Dr. Tonya M. Haff<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU">Collection Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU">Australian National Wildlife Collection<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU">CSIRO<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU">+61(0)419569109<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU" style="mso-fareast-language:EN-AU"><a href="https://www.csiro.au/en/about/facilities-collections/collections/anwc">https://www.csiro.au/en/about/facilities-collections/collections/anwc</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-AU"><o:p> </o:p></span></p>
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