Re: [Histonet] Chromic Acid Disposal
I agree with all these chemical means of disposal or management of wastes and toxic compounds. But hope anyone, as has been mentioned on many occasions by others, please check with your LOCAL waste/sewer/environmental/water entity. Having worked a bit in Florida, California, Washington and Missouri, they don't always agree with one another. And the reference, out of Singapore, is probably at odds with them too. Not only that, but even within a state, county or city rules and regulations can differ from one side of a boundary line to the other. Check locally or you may be suddenly stopped from doing something chemically or environmentally even with the best of your intentions. Ray Koelling lecturer, University of Washington School of Medicine Spokane WWAMI site > On April 15, 2019 at 8:34 AM Tyrone Genade via Histonet > wrote: > > > Hello, > > For the disposal of Chromic acid see > https://www.chemistry.nus.edu.sg/PSSO/safety/Special%20Chemical%20Waste.htm > and > https://study.com/academy/lesson/chromic-acid-solution-preparation-disposal-hazards.html > (more > detailed). > > You can precipitate the chrome as Cr(III) and store this solid for waste > disposal instead of liquid chromic acid. In the process the acid is > neutralized and the supernatant (of sulfates, potassium and sodium ions) > diluted and washed down the sink. > > I hope that helps. > > Tyrone > ___ > Histonet mailing list > Histonet@lists.utsouthwestern.edu > http://lists.utsouthwestern.edu/mailman/listinfo/histonet ___ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet
Re: [Histonet] Chromic Acid Disposal
Hello, For the disposal of Chromic acid see https://www.chemistry.nus.edu.sg/PSSO/safety/Special%20Chemical%20Waste.htm and https://study.com/academy/lesson/chromic-acid-solution-preparation-disposal-hazards.html (more detailed). You can precipitate the chrome as Cr(III) and store this solid for waste disposal instead of liquid chromic acid. In the process the acid is neutralized and the supernatant (of sulfates, potassium and sodium ions) diluted and washed down the sink. I hope that helps. Tyrone ___ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet
Re: [Histonet] Chromic Acid Disposal
If you have an account with a waste company for other things, you can certainly ask them - my Stericycle rep has been a great resource. We used to have Clean Harbors/Safety-Kleen, I'm sure they can all help Alison Perl, HTL(ASCP)CM Anatomic Pathology Manager (914) 302-8424 ap...@cmmedical.com -Original Message- From: Terri Braud via Histonet [mailto:histonet@lists.utsouthwestern.edu] Sent: Friday, April 12, 2019 1:32 PM To: 'histonet@lists.utsouthwestern.edu' Subject: [EXTERNAL] Re: [Histonet] Chromic Acid Disposal The best thing to do would be to contact either your city chemist or the state EPA inspector to be sure to be in compliance with all local regulations. A reducing agent, such as sodium metabisulfite, sodium sulfite or sodium thiosulfate can be used to turn CrO3 into the less toxic Cr(III) oxide. Alternatively, I would collect the waste and have a chemical waste disposal company dispose of it. I'm not a big fan of the "flush-it-down-the-sink-with-water" method, unless we are talking minutes amounts. If nothing else, it is about being a better steward of our planet. Terri L. Braud, HT(ASCP) Anatomic Pathology Supervisor Laboratory Holy Redeemer Hospital 1648 Huntingdon Pike Meadowbrook, PA 19046 ph: 215-938-3689 fax: 215-938-3874 Care, Comfort, and Heal -Original Message- From: histonet-requ...@lists.utsouthwestern.edu [mailto:histonet-requ...@lists.utsouthwestern.edu] Sent: Friday, April 12, 2019 1:00 PM To: histonet@lists.utsouthwestern.edu Subject: Histonet Digest, Vol 185, Issue 6 CAUTION: This is an EXTERNAL EMAIL. Stop and think before clicking links or opening attachments. Send Histonet mailing list submissions to histonet@lists.utsouthwestern.edu To subscribe or unsubscribe via the World Wide Web, visit http://lists.utsouthwestern.edu/mailman/listinfo/histonet or, via email, send a message with subject or body 'help' to histonet-requ...@lists.utsouthwestern.edu You can reach the person managing the list at histonet-ow...@lists.utsouthwestern.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of Histonet digest..." Today's Topics: 1. Re: 5% Chromic acid disposal (Bob Richmond) 2. Re: 5% Chromic acid disposal (Bryan Llewellyn) -- Message: 1 Date: Thu, 11 Apr 2019 13:29:09 -0400 From: Bob Richmond To: "Histonet@lists.utsouthwestern.edu" Subject: Re: [Histonet] 5% Chromic acid disposal Message-ID: Content-Type: text/plain; charset="UTF-8" Sharon at Celligent Diagnostics in Spartanburg SC asks: >>We are changing our GMS stain over from a Periodic acid kit to a 5% chromic acid kit. What do the labs that use chromic acid in special staining do with the waste/ used chromic acid?<< I hope someone can give an authoritative answer to this question, with references. Chromic acid (chromium trioxide, CrO3) is a strong oxidant, and chromium is toxic and an environmental hazard. I'd be comfortable with pouring it down the drain with a LOT of water, but what do the authorities want us to do? Bob Richmond Samurai Pathologist Maryville TN -- Message: 2 Date: Thu, 11 Apr 2019 11:26:01 -0700 From: Bryan Llewellyn To: Histonet Subject: Re: [Histonet] 5% Chromic acid disposal Message-ID: <0cabb492-6985-4cb6-0783-172a98cdc...@shaw.ca> Content-Type: text/plain; charset=UTF-8; format=flowed I suspect disposal might vary depending on the State. I live in British Columbia and we had permission from out city (Prince George) to use a dribble tank with lots of water and flush them into the local river (The Fraser), but I opted to collect all the toxic chemicals and ship them periodically to a facility in our neighboring Province of Alberta for recovery and reuse. There must be facilities of that kind somewhere in the United States, I would think. That is probably the best option. We used the same procedure for mercury salts, osmium tetroxide, etc. Bryan Llewellyn Bob Richmond via Histonet wrote: > Sharon at Celligent Diagnostics in Spartanburg SC asks: > >>> We are changing our GMS stain over from a Periodic acid kit to a 5% > chromic acid kit. What do the labs that use chromic acid in special > staining do with the waste/ used chromic acid?<< > > I hope someone can give an authoritative answer to this question, with > references. Chromic acid (chromium trioxide, CrO3) is a strong oxidant, and > chromium is toxic and an environmental hazard. I'd be comfortable with > pouring it down the drain with a LOT of water, but what do the authorities > want us to do? > > Bob Richmond > Samurai Pathologist > Maryville TN > ___ > Histonet mailing list > Histonet@lists.utsouthwestern
Re: [Histonet] Chromic Acid Disposal
The best thing to do would be to contact either your city chemist or the state EPA inspector to be sure to be in compliance with all local regulations. A reducing agent, such as sodium metabisulfite, sodium sulfite or sodium thiosulfate can be used to turn CrO3 into the less toxic Cr(III) oxide. Alternatively, I would collect the waste and have a chemical waste disposal company dispose of it. I'm not a big fan of the "flush-it-down-the-sink-with-water" method, unless we are talking minutes amounts. If nothing else, it is about being a better steward of our planet. Terri L. Braud, HT(ASCP) Anatomic Pathology Supervisor Laboratory Holy Redeemer Hospital 1648 Huntingdon Pike Meadowbrook, PA 19046 ph: 215-938-3689 fax: 215-938-3874 Care, Comfort, and Heal -Original Message- From: histonet-requ...@lists.utsouthwestern.edu [mailto:histonet-requ...@lists.utsouthwestern.edu] Sent: Friday, April 12, 2019 1:00 PM To: histonet@lists.utsouthwestern.edu Subject: Histonet Digest, Vol 185, Issue 6 CAUTION: This is an EXTERNAL EMAIL. Stop and think before clicking links or opening attachments. Send Histonet mailing list submissions to histonet@lists.utsouthwestern.edu To subscribe or unsubscribe via the World Wide Web, visit http://lists.utsouthwestern.edu/mailman/listinfo/histonet or, via email, send a message with subject or body 'help' to histonet-requ...@lists.utsouthwestern.edu You can reach the person managing the list at histonet-ow...@lists.utsouthwestern.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of Histonet digest..." Today's Topics: 1. Re: 5% Chromic acid disposal (Bob Richmond) 2. Re: 5% Chromic acid disposal (Bryan Llewellyn) -- Message: 1 Date: Thu, 11 Apr 2019 13:29:09 -0400 From: Bob Richmond To: "Histonet@lists.utsouthwestern.edu" Subject: Re: [Histonet] 5% Chromic acid disposal Message-ID: Content-Type: text/plain; charset="UTF-8" Sharon at Celligent Diagnostics in Spartanburg SC asks: >>We are changing our GMS stain over from a Periodic acid kit to a 5% chromic acid kit. What do the labs that use chromic acid in special staining do with the waste/ used chromic acid?<< I hope someone can give an authoritative answer to this question, with references. Chromic acid (chromium trioxide, CrO3) is a strong oxidant, and chromium is toxic and an environmental hazard. I'd be comfortable with pouring it down the drain with a LOT of water, but what do the authorities want us to do? Bob Richmond Samurai Pathologist Maryville TN -- Message: 2 Date: Thu, 11 Apr 2019 11:26:01 -0700 From: Bryan Llewellyn To: Histonet Subject: Re: [Histonet] 5% Chromic acid disposal Message-ID: <0cabb492-6985-4cb6-0783-172a98cdc...@shaw.ca> Content-Type: text/plain; charset=UTF-8; format=flowed I suspect disposal might vary depending on the State. I live in British Columbia and we had permission from out city (Prince George) to use a dribble tank with lots of water and flush them into the local river (The Fraser), but I opted to collect all the toxic chemicals and ship them periodically to a facility in our neighboring Province of Alberta for recovery and reuse. There must be facilities of that kind somewhere in the United States, I would think. That is probably the best option. We used the same procedure for mercury salts, osmium tetroxide, etc. Bryan Llewellyn Bob Richmond via Histonet wrote: > Sharon at Celligent Diagnostics in Spartanburg SC asks: > >>> We are changing our GMS stain over from a Periodic acid kit to a 5% > chromic acid kit. What do the labs that use chromic acid in special > staining do with the waste/ used chromic acid?<< > > I hope someone can give an authoritative answer to this question, with > references. Chromic acid (chromium trioxide, CrO3) is a strong oxidant, and > chromium is toxic and an environmental hazard. I'd be comfortable with > pouring it down the drain with a LOT of water, but what do the authorities > want us to do? > > Bob Richmond > Samurai Pathologist > Maryville TN > ___ > Histonet mailing list > Histonet@lists.utsouthwestern.edu > http://lists.utsouthwestern.edu/mailman/listinfo/histonet > -- Subject: Digest Footer ___ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet -- End of Histonet Digest, Vol 185, Issue 6 ___ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet
