All-

Thank you all for your advice and careful consideration of the best approach to deal with this issue. I appreciate everyone's comments. Based on what I have heard and since we do not plan to keep the pump, we will more than likely treat the whole unit as one hazardous waste disposal. One of the professors wanted to keep the mercury so they could use it in a demo to show density concepts. However, I have been trying to convince them that it is probably not the best way to go. We already have an amazing demo in house that demonstrates this better in my humble opinion.

Have a great rest of your week and thanks again.

Todd

On Wed, Apr 20, 2022 at 7:33 AM Kolodziej, Christopher <ckolodziej**At_Symbol_Here**ehs.ucla.edu> wrote:

A few years back, we had a mercury thermometer break inside a drying oven. Rather than deal with the headache of trying to disassemble and decontaminate the whole thing, we disposed of the entire oven as hazardous waste. I don=E2=80™t know if that was the most economical choice we could have made, but it was a straightforward solution that minimized risk of exposure and allowed us to quickly move forward.

________________________________

Christopher M. Kolodziej, Ph.D.
Chemical Hygiene Officer

UCLA Environment, Health & Safety | Chemical Safety

Mobile: (310) 261-8611

Book a virtual appointment

My working hours may not be your working hours. Please do not feel obligated to reply outside of your normal work schedule.

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Bruce Van Scoy
Sent: Tuesday, April 19, 2022 9:07 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Mercury Diffusion Pump

Wow, that is big! I don't know if it would fit in a fume hood, but whoever deals with this needs to do it under negative exhaust ventilation until it is containerized. You may want to consider this - at this point the mercury is contained.

Wouldn't it be more prudent to keep it contained and reduce your, or the anyone disposing of it potential for inhalation exposure? Mercury has a STEL of 0.03 mg/m3 with a Skin notation and if it takes longer than 15 minutes, the TWA is 0.01 mg/m3.

If I were to do it, or have someone within my organization perform I would coordinate with an Occupational Health Physician to obtain urine samples, prior to and following the shift to ensure the biological exposure indices remain below 20 ug/g creatine. You need to show not personnel exposure prior to and following the action.

BruceV

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Info
Sent: Tuesday, April 19, 2022 4:12 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Mercury Diffusion Pump

I was waiting for pictures of this unit before commenting. I resized them and reduced the shadows before committing them to the Listserv Archives at the following URL's, so they will live on with this post. And now we all see why Todd was asking for our sage collective advice!

http://www.ilpi.com/dchas/2022/pics/diffpump_whole.jpg

http://www.ilpi.com/dchas/2022/pics/diffpump_side.jpg

http://www.ilpi.com/dchas/2022/pics/diffpump_lower.jpg

http://www.ilpi.com/dchas/2022/pics/diffpump_lower2.jpg

When I first read the description, I was afraid this was a classic Bercaw (CalTech) design in which the pump was integrated into a single bench-long (or multi bench) piece of glass, in which case you=E2=80™d need advanced techniques to deal with it. I have seen work done on a pump on a design like that once in my lifetime. The glassblower used a Nichrome wire to cut the pump from the line. And, of course, not many schools have that capability anymore in which case the next best way to cut it out would be to score the line with a carbide tool or file, wet the line, and then apply a glob of hot glass which, ideally, would cause a clean break. But I see that this one is modular, so none of this is a concern here.

That said, that's a BEAST of a pump. Let=E2=80™s get the most easily-addressed concern out of the way first:

1. There's a decent chance that's an asbestos board the diffusion pump heater is attached to and it looks rather friable. Check with your local/state authorities and or waste contractor. The amount is small, so depending on the applicable regs, this is likely to be a do it yourself (or EHS folks) project should you choose to do so. In theory, it could be easy as respirator up, cut the wires, double bag and tape it up securely. Don't mess with trying to unscrew the heater from the base. But again, don't think about it without official guidance. It may not be asbestos, but I assume the cost of a test is probably about the same as disposing of it so it's easiest just to treat it as such.

2. That is a huge sucker, but at least it comes off as one piece. The best/easiest bet is what someone else suggested - see if your waste contractor will take it whole kit and kaboodle without emptying it.

3. If you do want to remove the mercury from it, you are going to need to plan that carefully. REALLY carefully. It will involve **pouring it out** either the side arm or the top and that opaque tape-covered bulb (which I am assuming is a cryogenic Dewar of some kind) is going to make that a challenge. I see many ways that could go south or worse given the length of the pump, the various crannies, and the shifting weight of the mercury. The splashing and spilling would be a big concern, so you'd want to put a plastic tarp down on the floor where you=E2=80™re working AND use a huge flat containment tray AND be wearing full Tyvek including booties AND have the receiving flask securely clamped - just as starters. If I was tasked with this, my approach would be to set up secondary containment and use the score/hot glass method to cut the thing in half at the neck below the taped-up bulb. That would let your pour it out much more easily. But that's just a thought based on my own personal comfort/experience working with these kinds of systems and it's not something a novice should attempt.

4. Assuming you did remove the mercury successfully, you are still left with the question - dispose of the contaminated pieces as solid waste or clean the pieces with dilute nitric acid (as discussed by others in this thread). The later is doable, but you are going to generate a couple liters of nitric/mercury waste in the process. Not a biggie in itself, but compare that cost (and effort, time, risk) to trashing the glass as solid waste and I suspect solid wasting is the way to go.

Honestly, unless someone there has experience working with these things, the most economical answer is to outsource the whole project even though that will seem like a lot of money.

But if you are inspired enough to tackle this on your own, here's my writeup on mercury in the laboratory which is worth a read first: http://www.ilpi.com/safety/mercury.html

Please feel free to follow up with additional questions/comments.

Rob Toreki

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On Apr 18, 2022, at 4:59 PM, Todd Melgreen <tmelgreen**At_Symbol_Here**WILLAMETTE.EDU> wrote:

Hello All-

I was hoping that someone on this e-mail list may have some answers to a few questions regarding a mercury diffusion pump.

We would like to remove the mercury from the diffusion pump. Once the mercury is removed we would like to dispose of the remaining glass diffusion pump properly, I am wondering if anyone has any experience or has attempted to do this previously that we could learn from.

Questions are:

What is the easiest way to remove the mercury from the diffusion pump?

Are there vendors who deal with disposing of mercury contaminated glass?

I appreciate any insight or help that can be provided. Thanks. I do have photos of the pump but they can't be sent to this list serve. So if seeing these would help you please email me directly and I can send them your way. Thanks again for your help in advance?

Regards,

Todd A. Melgreen, ASP

Chemical Hygiene Officer & Chemistry Lab/Stockroom Manager

Chemistry Department
Willamette University
900 State Street
Salem, OR 97301

office: Collins 303 ext#6833

stockroom: Olin 411 ext#6734
phone: 503-370-6833
cell phone: 541-760-5780

fax: 503-375-5425
email: tmelgreen**At_Symbol_Here**willamette.edu

Pronouns: He/Him/His

I respectfully acknowledge that Willamette University was built on the land of the Kalapuya, who today are represented by the Confederated Tribes of the Grand Ronde and the Confederated Tribes of the Siletz Indians, whose relationship with this land continues to this day. I am grateful to the land itself, to those who have stewarded it for generations, and for the opportunity to study, learn, work, and be in community on this land. I acknowledge that the University's history, like many others, is fundamentally tied to the first colonial developments in the Willamette Valley. I respectfully acknowledge and honor past, present, and future Indigenous students of Willamette.

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