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Hi,</div>
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I need some advice on waste disposal and management of the following chemical mixtures:</div>
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<span style="font-family: Calibri, sans-serif;">1. 1 mM AgNO3 and 0.5 vol% HF</span><o:p></o:p></p>
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<span style="font-family: Calibri, sans-serif;">2.</span><span style="font-size: 7pt;"> </span><span style="font-family: Calibri, sans-serif;">12.5 vol% HF, 3 vol% H2O2 and 84.5% deionized (DI) water</span><o:p></o:p></p>
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<span style="font-family: Calibri, sans-serif;">3.</span><span style="font-size: 7pt;"> </span><span style="font-family: Calibri, sans-serif;">5ml HF, 30ml H2O2 , 48ml H2O/4.8g C4H6O6 (10%)</span></p>
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<span style="font-family: Calibri, sans-serif;">When we place the above mixtures (2,3) in waste bottles, they still generate some gases. E&HS refuses to pick up these wastes until the reaction is complete.</span></p>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;">It can take a while for the reaction to stop releasing any gases and as a result the waste bottles sit in our lab for a while until they are picked up. It is also not practical</span></p>
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and safe to keep opening the bottles to release the gas. We are also running out of space to keep the waste bottles.</p>
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I was wondering if there is a better way of managing these specific chemical waste and also, whether there is a safe and cost-effective way to stop the reactions (2,3) before we have them picked up by E&HS. A quick search suggests Oxalic acid to quench</p>
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the H202 but we have a mixture of H202 with other chemicals.</p>
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Thanks</p>
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Regards</p>
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Aju</p>
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<font class="Apple-style-span" color="#103ffb" face="Georgia" size="2">Aju Jugessur <i>Ph.D.</i><br>
Director, University of Iowa Microfabrication Facility<br>
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<font class="Apple-style-span" color="#103ffb" face="Georgia" size="2">Professor (Adj.), Physics and Astronomy<br>
OSTC, Iowa Advanced Technology Labs<br>
University of Iowa</font></div>
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<font class="Apple-style-span" color="#103ffb" face="Georgia" size="2">205 N. Madison St</font></div>
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<font class="Apple-style-span" color="#103ffb" face="Georgia" size="2">Iowa City, IA 52242<br>
319 -353-2342 <br>
aju-jugessur@uiowa.edu<br>
http://ostc.uiowa.edu/uimf</font></div>
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