From: Craig Merlic <merlic**At_Symbol_Here**CHEM.UCLA.EDU>
Subject: Re: [DCHAS-L] Quick Question
Date: Fri, 3 Sep 2021 14:03:50 -0700
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 31AB721B-9A24-48FD-89AC-162BD49FD696**At_Symbol_Here**

Ruth Ann,


It would be helpful to know which compound we are talking about. However, let's look at the basic information you gave us from a Chemistry perspective. You said it was an ionic liquid. Hence it is a liquid salt! So it will not be volatile. Thus, unless it is sprayed around there should be no exposure, i.e. very low risk. Therefore, use in a chemical fume hood with controlled transfers is appropriate.


Seems like the respirator information in Section 8 of the SDS was boilerplate for industrial scale and legal protection.





Craig A. Merlic

Professor of Chemistry, UCLA Department of Chemistry and Biochemistry

Executive Director, UC Center for Laboratory Safety

Los Angeles, CA  90095-1569

Voice:  310-825-5466



From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> on behalf of John Callen <jbcallen**At_Symbol_Here**GMAIL.COM>
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Date: Friday, September 3, 2021 at 1:47 PM
To: <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Subject: Re: [DCHAS-L] Quick Question


Ruth Ann,


It would be helpful to know what the "ionic liquid" or the exact chemical is to make an assessment.  Also, it would be even better if you could provide us with the CAS Number and SDS.  Thanks!


The information in the SDS regarding "respiratory protection" as highlighted below is not cryptic and I believe is very straight forward, based of course, upon the required monitoring the air quality respect to the contaminant(s) in question.


Be Safe and Stay Healthy!


John B. Callen, Ph.D.

3M Personal Safety Division - Retired

ACS/DCHAS Founding Member

(312) 632-0195

On Sep 3, 2021, at 14:57, Murphy, Dr. Ruth Ann <rmurphy**At_Symbol_Here**UMHB.EDU> wrote:


Greetings and Happy Labor Day Weekend,


Should a compound (ionic liquid) with the following SDS statement be safe to use in small amounts, e.g., 5 g, in a fume hood, without a respirator?  We would just be making solutions and running them through a viscometer. Students are enthusiastic about this project, but I am cautious.   The highlighted info in the SDS statement below about a risk assessment seems a bit cryptic.


SECTION 8: Exposure controls/personal protection 
8.1 Control parameters 
Components with workplace control parameters 
Contains no substances with occupational exposure limit values. 
8.2 Exposure controls 
Appropriate engineering controls 
Handle in accordance with good industrial hygiene and safety practice. Wash hands 
before breaks and at the end of workday. 
Personal protective equipment 
Eye/face protection 
Safety glasses with side-shields conforming to EN166 Use equipment for eye 
protection tested and approved under appropriate government standards such as 
NIOSH (US) or EN 166(EU). 
Skin protection 
Handle with gloves. Gloves must be inspected prior to use. Use proper glove 
removal technique (without touching glove's outer surface) to avoid skin contact 
with this product. Dispose of contaminated gloves after use in accordance with 
applicable laws and good laboratory practices. Wash and dry hands. 
Body Protection 
Impervious clothing, The type of protective equipment must be selected according 
to the concentration and amount of the dangerous substance at the specific 
Respiratory protection 
Where risk assessment shows air-purifying respirators are appropriate use a full-
face respirator with multi-purpose combination (US) or type ABEK (EN 14387) 
respirator cartridges as a backup to engineering controls. If the respirator is the sole 
means of protection, use a full-face supplied air respirator. Use respirators and 
components tested and approved under appropriate government standards such as 

Thank you!


Ruth Ann


Ruth Ann Cook Murphy, Ph.D.

Professor of Chemistry

Chairperson, Department of Chemistry, Environmental Science and Geology

Co-Chairperson, Health Professions Advisory Committee

Amy LeVesconte Professorship of Chemistry

JAMP Faculty Director

University of Mary Hardin-Baylor

900 College Street

Belton, TX  76513-2599

Phone 254.295.4542

Accepting Christ is life's greatest decision; following Christ is life's greatest adventure.







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