From:
James Kaufman <jkaufman**At_Symbol_Here**LABSAFETYINSTITUTE.ORG>
Subject:
Re: [DCHAS-L] Optimal Number of Students per TA/Instructor in General Chemistry Labs
Date:
Aug 25, 2025 20:18 UTC
Reply-To:
ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID:
<CAHk9oERqFfvMW4R7KKekEc33kDtn0=Uv-RJ9sBL28p9PdTU9Pg**At_Symbol_Here**mail.gmail.com>
In-Reply-To:
<SN6PR01MB49275434BEAAF769F4E9D8BFEE3EA**At_Symbol_Here**SN6PR01MB4927.prod.exchangelabs.com>
Pat ...
This is a recipe for disaster. It is sure starter fluid for a serious injury. It is a guaranteed big settlement in the plaintiff's favor. It completely disregards the recommendations of the American Chemical Society and Prudent Practices in the Laboratory. Need I say more.
And now ... I'll put my money where my mouth is ...
I will volunteer to teach our Leadership in Safety seminar for your senior administrators (President and his direct reports). I have done this previously for the Presidents of TAMU in both College Station and Laredo (and others throughout the United States and around the world).
Hoping to meet you at the seminar and not in court ... Jim
PS. LSI now has
virtual lab inspections, safety program evaluations, document reviews, plus
courses and seminars ... all virtual. And, a complimentary, updated version of our classic Laboratory Safety Guidelines is now available on our website ... https://www.labsafety.org/product/lab-safety-rules,
Plus ... be sure to take our Safer Science Self-Assessment to see how your organization stacks up! K-12: Safer Science Self-Assessment
Small University, College, Community College: Safer Science Self-Assessment
James A.
Kaufman, PhD
Founder/President
Emeritus
The
Laboratory Safety Institute (LSI)
A Non-profit
Educational Organization for Safety
in Academic, Industrial, and
Government Laboratories
101 Oak Street, Wellesley, MA 02482 (MA Office)
(O)
508-647-1900 (C)
508-574-6264
Skype:
labsafe; 508-401-7406 jkaufman**At_Symbol_Here**labsafety.org www.labsafety.org
Teach, Learn,
and Practice Science Safely
Hello all,
We have had an explosion in the number of freshmen who are taking general chemistry this term, but funding has limited the number of TAs and instructors we have per lab room. The way the department has had
to deal with this is to increase the number of students from 30 to 38 per section (limited by the Fire Marshall’s maximum occupancy of the rooms). They work in groups of 3 (not ideal at all). We have adjoining labs, so our shortage of instructors has been
solved by having an instructor supervise two sections being held concurrently in a set of those labs. There is one TA per section.
In the past we have had 30 students (10 groups) supervised by a dedicated instructor (not working concurrent sections) and a TA, so about 15 students per person supervising. Now we can have as many as 38 students
(13 groups) being supervised by one person at times, as the instructor moves between sections. I feel this is not safe.
What do people think is a safe ratio of supervising people to students (or student groups)?
Thanks,
Patricia Leach
Lab Manager
Department of Chemistry & Biochemistry

SLC 3.513
Office: 972-883-6583
Cell: 469-891-6426
---
For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at
membership**At_Symbol_Here**dchas.org
---
For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at
membership**At_Symbol_Here**dchas.org