A review of this
practice, Yale's Chemical Safety Committee has concluded
that only food-grade liquid nitrogen should be used for
this. Food-grade liquid nitrogen is more expensive and is
supplied only in larger quantities (150 liters). Food-grade
liquid nitrogen must meet more rigorous tolerances for
purity. We found only one instance for which this was
purchased, so we are in a quandary policy-wise.
We also found that
most transfer dewars have debris and other contaminate in
them. These can easily end up in the ice cream.
Although we are
concerned about purity and contamination, we have not found
an instance where this has caused an illness, but we believe
the risk exists.
Safety seems to
take the fun out of everything. It's what we do.
Pete
Peter A. Reinhardt
Director, Office of
Environmental Health & Safety
Yale University
135 College St., Suite
100
New Haven, CT
06510-2411
(203) 737-2123
peter.reinhardt**At_Symbol_Here**yale.edu
From:
ACS Division of Chemical Health and Safety
[mailto:DCHAS-L**At_Symbol_Here**PRINCETON.EDU]
On Behalf Of Melissa Anderson
Sent: Thursday, September 22, 2016 4:30 PM
To: DCHAS-L**At_Symbol_Here**PRINCETON.EDU
Subject: [DCHAS-L] Liquid Nitrogen Ice Cream
I have a colleague who's interested in
making liquid nitrogen ice cream as an outreach activity and
he asked me about safety/risk implications. Does anyone have
any experience with this from a risk assessment perspective?
--- This e-mail is from DCHAS-L, the e-mail
list of the ACS Division of Chemical Health and Safety. For
more information about the list, contact the Divisional
secretary at
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