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Previous by Date: Subject: Re: Peroxide Question Date: Tue, 21 Sep 2010 10:07:41 -0400 Author: "Bell,Martin" |
Next by Date: Subject: Re: Peroxide Question Good to hear that. That's what I've done twice. Monona Date: Tue, 21 Sep 2010 13:00:55 EDT Author: ACTSNYC**At_Symbol_Here**CS.COM |
We have to call in the bomb squad. Karen Smith, CSMM Chemistry Stockroom Manager Whitman College 345 Boyer Ave. Walla Walla, WA 99362 509 527-5272 On Sep 20, 2010, at 4:45 PM, Andrew Stice wrote: > So, if your waste hauler won't accept bottles with greater than 10ppm, > then what do you do with those bottles that are over 10ppm? > > -----Original Message----- > From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**list.uvm.edu] On > Behalf Of > Karen Smith > Sent: Monday, September 20, 2010 6:18 PM > To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU > Subject: Re: [DCHAS-L] Peroxide Question > > Our waste handler won't accept bottles over 10ppm peroxide, therefore > that's my limit. > > Karen Smith, CSMM > Chemical Hygiene Officer/ Lab Coordiantor > Whitman College > 345 Boyer Ave. > Walla Walla, WA 99362 > 509 527-5272 > > > > > On Sep 20, 2010, at 12:10 PM, Johnson, Amy Carr wrote: > >> Here is a link to the article from which the excerpt below was taken >> regarding safe levels of peroxides > http://www.bnl.gov/esh/cms/PDF/peroxides.pdf >> >> >> >> "Kelly (7) reviewed the literature to determine the minimum >> hazardous concentration of peroxides in solution >> with organic solvents. Peroxide concentration of 100 ppm has been >> widely used as a control point, but lacks >> scientific justification and is probably based on the practical >> detection limit of the potassium iodide method. Kelly >> reported great disparity (range 50-10,000 ppm as hydrogen peroxide) >> between various references. There was little >> agreement between authors and none provided supporting data. The >> highest level (10,000 ppm) was found in a >> National Safety Council publication (16). However, the NSC >> publication included no supporting references for the >> latter statement or the NSC recommendation for administrative >> control value of 100 ppm. >> The Material Safety Data Sheet for diethyl ether cautions against >> concentrating ether containing peroxide level >> above 100 ppm (10). Presumably, instability and hazard increase with >> concentration such that at some point, the >> solution spontaneously explodes. Kelly suggested that it is likely >> that the control concentration of 100ppm, in some >> cases may be overly conservative by at least an order of magnitude. >> This may apply to the chemicals listed in Table >> 1-B unless the unstable materials are concentrated as result of >> solvent evaporation (7). >> Kelly (7) stated that "theoretically, explosion should be impossible >> for most solutions of <1% peroxides." >> However, to rationally establish a safe/hazard concentration is >> complicated by a number of factors. For example, >> some of the liquid may remain on the threads and cap when >> peroxidized liquids are dispensed from glass containers >> with screw-caps or with ground-glass stoppers. As the solvent >> evaporates, the peroxide can be concentrated to >> dangerous levels within in the threads of the cap. Thus, a volatile >> solvent containing relatively low peroxide >> contamination could explode because of peroxide concentration at the >> cap (3, 7). Dilute solutions of most >> peroxidizable chemicals or solutions in solvents with low volatility >> (B.P. > 300 o C or V.P. <0.1 mm Hg at 20 o C) >> usually do not pose a peroxide hazard and are not likely to >> concentrate. Thus, it is usually unnecessary to treat such >> solutions as peroxide hazards (3, 5). >> Some of the peroxidation products of the chemicals in Group A (Table >> 1) are less structurally stabile than those >> in Group B. Thus even peroxide concentrations of less than 100 ppm >> should be considered very hazardous. >> Unstabilized isopropyl ether can readily form highly unstable >> peroxides. Even low small concentrations produced >> through solvent evaporation are very dangerous and may explode on >> shaking (33). The temperature and >> concentration at which explosion of peroxides of isopropyl ether >> becomes probable has never been authoritatively >> stated (20)." >> >> Hope this helps- >> From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**list.uvm.edu] On >> Behalf Of Bill Galdenzi >> Sent: Friday, September 17, 2010 9:17 AM >> To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU >> Subject: [DCHAS-L] Peroxide Question >> >> All, >> >> I have a question: What concentration of peroxide do you folks use >> for your "acceptable" level? What is the basis for this level? >> >> Thanks for your help. >> >> Bill Galdenzi >> Environmental, Health, and Safety >> Boehringer-Ingelheim Pharamceuticals >> (203) 778-7759 >> bill.galdenzi**At_Symbol_Here**boehringer-ingelheim.com >>
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