Ellen:

 

I have a procedure that might be helpful to you.  I assisted a group with a very similar procedure in 2015 and ran into the same lack of info that you did when trying to put together a hazard control plan.  I worked closely with the researchers to problem solve our way to the final protocol. 

 

I just want to check with the researchers before I share their procedure outside of our institution.  Besides, it doesn’t hurt to check back in with them to make sure that all went according to plan!

 

 

 

Hi everyone,

We have a question from a colleague:

 

I have a researcher who is proposing to reflux a mixture of hot nitric 70%)/ perchloric (70%) and sulfuric acids (95%+) in a 1:2:1 mixture for removal of contamination from diamond surfaces. I was wondering if any of you have experience with a similar process? I’m concerned as there is limited information available for this method (published research data) and the available safety data does not recommend mixing sulfuric and perchloric acids not to mention heating such a mixture. We do have a perchloric acid hood available to the researcher, but I’m looking for a more defined, successfully executed process that can be used as reference in terms of apparatus, parameters such as time, temperature, volumes etc. Any feedback on overall safety considerations are also welcomed J

 

Ellen Sweet

Laboratory Ventilation Specialist

Department of Environmental Health and Safety, Cornell University

American Chemical Society, Division of Chemical Health and Safety

315-730-8896

 

--- For more information about the DCHAS-L e-mail list, contact the Divisional secretary at secretary**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchas