I think the original question was for TFA, not HF. We just had this conversation, and I thought the collective agreement was that TFA, while being a strong organic acid (not strong in terms of acid strength, but it does burn and hurt if spilled on oneself), is not something that releases HF, ever.

So while it will hurt like all get out if you spill it on you (I?ve done it), it is not something that goes down to the bone and does damage as HF does. So I don?t think calcium gluconate will do anything for TFA burns

Dave

On Jun 5, 2014, at 10:10 AM, Dan Kuespert wrote:

> It?s not just the bony materials. Ca2+ is a critical ion for various signaling and metabolic processes, and HF in sufficient quantity can disrupt metabolism extensively.
>
> We recently began planning for the use of gallon quantities of HF in one of our nano fabrication labs. One precaution we took was to contact the emergency room that would be receiving any injury and assure ourselves that they were equipped to quickly handle an HF exposure. (Despite our being part of Johns Hopkins, JH Hospital is not the university's nearest emergency department.)
>
> My experience with emergency rooms is that corrosive handlers should be trained to inform the triage nurse that they have a *chemical burn*, not a thermal burn. Otherwise, if it doesn?t look extensive, the nurse will hand them a tube of burn gel and sit them in the corner for 6 hours until somebody gets some free time. If you tell them it?s a chemical burn, at least they?ll probably provide you with irrigation facilities while you wait.
>
> regards,
> dan
>
> =============================
> Dr. Daniel R. Kuespert
> dkuespert**At_Symbol_Here**jhu.edu
> Homewood Laboratory Safety Advocate
> Krieger School of Arts & Sciences/Whiting School of Engineering
> The Johns Hopkins University
> 103G Shaffer Hall
> 3400 North Charles St.
> Baltimore, MD 21218
> (410) 516-5525
>
> On May 16, 2014, at 12:07 AM, Patrick Cruver wrote:
>
>> Sheila-
>>
>> Yes, and they should be taken to the local hospital ER very quickly. The patient should be kept for observation in case some of the HF still remains. It can continue to drill down in to find bony materials and cause damage---including death. These are instructions I received from the ER Director of our local hospital when I was doing safety and IH for Washington State University.
>>
>> Regards,
>>
>> Patrick Cruver
>>
>> From: Kennedy, Sheila
>> Sent: Thursday, May 08, 2014 9:43 AM
>> To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
>> Subject: Re: [DCHAS-L] first aid for HF
>>
>> We keep a tube of calcium gluconate gel in the lab first aid kit; it?s the recommended immediate treatment (following water wash). Never been used & (according to expiration date) needs to be replaced annually.
>>
>> Sigma Aldrich MSDS:
>> FIRST AID MEASURES
>> General advice
>> Consult a physician. Show this safety data sheet to the doctor in attendance. Hydrofluoric (HF) acid burns require
>> immediate and specialized first aid and medical treatment. Symptoms may be delayed up to 24 hours depending on the
>> concentration of HF. After decontamination with water, further damage can occur due to penetration/absorption of the
>> fluoride ion. Treatment should be directed toward binding the fluoride ion as well as the effects of exposure. Skin
>> exposures can be treated with a 2.5% calcium gluconate gel repeated until burning ceases. More serious skin exposures
>> may require subcutaneous calcium gluconate except for digital areas unless the physician is experienced in this
>> technique, due to the potential for tissue injury from increased pressure. Absorption can readily occur through the
>> subungual areas and should be considered when undergoing decontamination. Prevention of absorption of the fluoride
>> ion in cases of ingestion can be obtained by giving milk, chewable calcium carbonate tablets or Milk of Magnesia to
>> conscious victims. Conditions such as hypocalcemia, hypomagnesemia and cardiac arrhythmias should be monitored for,
>> since they can occur after exposure. Move out of dangerous area.
>>
>> SMK
>> _________________________________
>> Sheila Kennedy, C.H.O.
>> Safety Coordinator | Teaching Laboratories
>> UCSD Chemistry & Biochemistry |MC 0303
>> s1kennedy**At_Symbol_Here**ucsd.edu | http://www-chem.ucsd.edu
>> Office: (858) 534-0221 | Fax: (858) 534-7687
>> _________________________________
>>
>> From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Kim Gates
>> Sent: Thursday, May 08, 2014 5:55 AM
>> To: DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU
>> Subject: [DCHAS-L] Question on trifluoracetic acid & emergencies
>>
>> One of the labs on campus asked about having an HF emergency kit for trifluoracetic acid use.
>>
>> I need the collective wisdom of his group - yes? no? references? (the SDS doesn't mention anything about this)
>>
>> Thanks
>>
>> Kim Gates
>> Laboratory Safety Specialist
>> Environmental Health & Safety
>> Stony Brook University
>> Stony Brook, NY 11794-6200
>> Kim.Gates**At_Symbol_Here**stonybrook.edu
>> 631-632-3032
>> FAX: 631-632-9683
>> EH&S Web site: http://www.stonybrook.edu/ehs/lab/
>

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