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<div class="moz-cite-prefix">Hi Mandy and Tonya,</div>
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<div class="moz-cite-prefix">Formalin solution is a technical solution of the gas in water until it is saturated (37% v/v or 40% w/v); above this the vapour pressure drives the gas out of the water, i.e., the gas escapes into the surrounding air. This effect
is well observable when formalin-fixing specimens in hotter climates, where the formaldehyde gas that escaped from the solution is trapped below the lid of the container, and escapes from the container, each time the lid is opened (which can lead to a considerable
reduction of the formaldehyde concentration in the fixation container). <br>
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<div class="moz-cite-prefix">By leaving the lid on the jars, you may affect the off-gasing of the formaldehyde, but you could increase the water-changing intervals to mitigate this.</div>
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<div class="moz-cite-prefix">Hope this helps</div>
<div class="moz-cite-prefix">Dirk <br>
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<div class="moz-cite-prefix">Am 22.09.2022 um 04:38 schrieb Haff, Tonya (NCMI, Crace):<br>
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Hi Mandy,</div>
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<br>
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We have and do face similar fume hood bottlenecks. I will let others speak more specifically about soaking in water with a lid on, but we solved many of our problems by purchasing a 'portable' (well, moveable...it's on a stand on casters) fume hood specially
fitted with formaldehyde filters and alarm. If this is of interest let me know and I'm happy to pass on supplier info, etc.</div>
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Cheers,</div>
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<br>
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Tonya</div>
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<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Nhcoll-l
<a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l-bounces@mailman.yale.edu">
<nhcoll-l-bounces@mailman.yale.edu></a> on behalf of Mandy Reid <a class="moz-txt-link-rfc2396E" href="mailto:Mandy.Reid@Australian.Museum">
<Mandy.Reid@Australian.Museum></a><br>
<b>Sent:</b> Thursday, 22 September 2022 11:17 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">
nhcoll-l@mailman.yale.edu</a> <a class="moz-txt-link-rfc2396E" href="mailto:nhcoll-l@mailman.yale.edu">
<nhcoll-l@mailman.yale.edu></a><br>
<b>Cc:</b> Rhiannon Stephens <a class="moz-txt-link-rfc2396E" href="mailto:Rhiannon.Stephens@Australian.Museum">
<Rhiannon.Stephens@Australian.Museum></a><br>
<b>Subject:</b> [Nhcoll-l] Formalin transfer</font>
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<p class="x_MsoNormal"><a name="x__Hlk43465280" moz-do-not-send="true">We are currently working on a large project at the Australian Museum to transfer our entire mollusc collection out of formalin (in which it has been stored for historical reasons) and into
ethanol for long term preservation.</a></p>
<p class="x_MsoNormal"><span style=""> </span></p>
<p class="x_MsoNormal"><span style="">We normally soak each specimen lot out in 3 changes of water in a fume hood with lids left off the containers/vials etc. to assist with degassing of the formaldehyde in solution. Our problem is a bottleneck in our workflow
due to limitations imposed by our fumehood work space. I am wondering whether others in the group have faced similar issues and whether soaking out can possibly be done in water but leaving the lids on the containers (hence could be done on a lab bench after
pouring off the formalin in the fume hood)? We don’t have a way to measure residual formalin after the soaking-out process so don’t know whether or not this will be effective.
</span></p>
<p class="x_MsoNormal"><span style=""> </span></p>
<p class="x_MsoNormal"><span style="">Any advice would be much appreciated.</span></p>
<p class="x_MsoNormal"><span style="">Mandy</span></p>
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