Another safety and quality option is to purchase the costly but effective HF dispensers that will go on the bottle and dispense the calculated amount of HF. This way, you avoid pouring and other risky steps and assure only the amount needed is dispensed and used. After a comprehensive study of HF and HF safety needs, we decided that we could do what we needed by just leaching the elements from fumed silica with high pressure microwave digestion. We obtained similar data to what the supplier of the fumed silica obtained from HF digestion and we did not need to use HF. However, that only worked because we had an extremely finely divided material and were able to get adequate performance from that approach. I am not suggesting that those involved in digesting rocks could do the same. I am glad we can do what we need without HF. Nasty, nasty stuff to work with. Although it works great, I am also not fond of working with perchloric acid either.
Flora Research Laboratories
An FDA and DEA Registered & Inspected Laboratory
Fellow AOAC International
Adjunct Faculty Bastyr University
Botanical Medicine Department
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From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of Jay Tompkins
Sent: Thursday, September 15, 2011 3:02 PM
To: [log in to unmask]
Subject: Re: HF & other ideas
Some years ago I worked on a project in which we used normal phase HPLC with hexane as MPA and a mix of ether and hexane as MPB. We had to remove all olefins from the technical grade hexane using concentrated sulfuric acid mixed with the technical grade hexane in a sep funnel. For that task I wore a rubber apron which was at least calf length. Concentrated sulfuric acid will cause a lot of damage but I doubt it would lead to limb amputation followed by death. So HF sounds like really bad stuff and the PPE most of us in labs wear, well one would just as wear underwear in the lab, a lab coat would just be insufficient. I work in a bio-analytical lab and people washing dishes here wear a mask with respirator, a full length rubber apron and gloves that protect the whole arm so as to be protected from bio-hazards. I would think it would be foolhardy for anyone working with HF to wear anything less than this. I believe I ranted like this some time ago when HF was discussed.
Analytical BioChemistry Laboratories, Inc.,
4780 Discovery Drive,
Columbia MO 65201
Integrated Chemistry and Biology Services for Product Development