From: Dan Kuespert <dkuespert**At_Symbol_Here**JHU.EDU>
Subject: Re: [DCHAS-L] Updated glove video
Date: Tue, 16 Feb 2016 11:46:44 +0000
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: DE3075A5-9284-4B3A-9190-EBA1D0C4B2E5**At_Symbol_Here**
In-Reply-To <152d7ab5133-2283-12c18**At_Symbol_Here**>

I mentioned this to Ralph offline since I thought it a bit off-topic, but Monona's post makes it relevant. One thing we need to be inculcating in students is the difference between incidental contact and immersion/frequent contact applications of gloves. 

I know of an incident that involved researchers (accidentally) spraying acetonitrile solution on their K-C Purple Nitrile gloves instead of 70% ethanol. Fortunately, acetonitrile is volatile and it was determined that the gloves would stay wet for a minute or less, during which K-C's penetration data indicated a dose in the tens of picograms range. If they'd been dipping their hands in the mixture or washing handheld microscope slides for a half-hour or something, there would have been the potential for a much larger dose. Similarly, if Karen Wetterhahn had immediately removed her latex gloves instead of finishing her work first, she might have avoided her lethal dose of dimethylmercury.

I think it's important that students understand that the application/expected contact time affects the choice of suitable gloves. If you can expect very short contact time (and the penetration time isn't near-instant), AND your application is such that you'll actually notice the exposure, the Purple Nitrile gloves are suitable even for some chemicals that are colored red on the K-C chart. It's kind of a complicated topic, though, so I don't see it being related in a video. Having a full understanding of the issues involved in this might, as a side effect, encourage researchers to design their experiments to minimize the potential for hand contact (holding the slides with forceps to keep the hands out of the rinse solvent stream, etc.) 

(In the incident mentioned, there was of course a potential for inhalation exposure; fortunately, the spray was carried out in a ventilation stream right in front of a BSC, in a direction away from the researcher's breathing zone, so that was minimal.)


Dr. Daniel R. Kuespert
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 Feb 12, 2016, at 17:47, Monona Rossol <actsnyc**At_Symbol_Here**CS.COM> wrote:

In the first student video, why not simply say that both methanol and methylene chloride are capable of penetrating these thin nitrile Kimberly Clark gloves in under a minute?  And that if users are interested they can use the chart to see the rate at which the solvent is passed through the glove? And why not actually use Kimberly Clarks' recommendation that gloves be immediately removed if there is an incidental splash of the chemicals on the glove?

Monona Rossol, M.S., M.F.A., Industrial Hygienist
President:  Arts, Crafts & Theater Safety, Inc.
Safety Officer: Local USA829, IATSE
181 Thompson St., #23
New York, NY 10012     212-777-0062


-----Original Message-----
From: Stuart, Ralph <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
Sent: Wed, Feb 10, 2016 8:07 am
Subject: [DCHAS-L] Updated glove video

I thought I would let DCHAS-L know that I significantly updated the nitrile glove video based on comments from the list last month. The updated version is available at

In addition to adding information to the video, most specifically a reference to the Kimberly Clark nitrile glove selection guide, there is now a link at the Youtube site to a pdf file that inlcudes the powerpoint slides that appear in the video (this is partially to address issues that they go by too quickly in the video). There are also quiz and discussion questions for the video that might help it be of use in teaching lab settings. I hope to develop a module for the Keene State learning managing system that will allow this information to be included in undergraduate chemistry labs easily.

Comments and questions on the video would be appreciated.

- Ralph

Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College


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