Are you considering Magnesium Chloride that is specified as laboratory
grade and not just technical grade? Here is a definition of grades from
a chemical supplier that defines laboratory grade:
" DEFINITION OF GRADES
Reagent ACS -- Meets or surpasses latest American Chemical Society
standards for purity.
Reagent -- Does not exceed maximum limits of significant impurities as
stated. Does not have ultrastringent requirements of Reagent ACS.
Laboratory Grade -- Equivalent in purity to United States Pharmacopeia
(USP) and National Formulary (NF) listings. However, they are not
offered for food, drug, or medicinal use of any kind.
Practical Grade -- Sufficiently high quality for use in many syntheses
and other applications.
Technical Grade -- Selected commercial grades, scrupulously clean, and
of reasonable chemical purity. Where usable, most economical grade and
suitable for educational purposes."
There is Magnesium Chloride used for de-icing roads and sidewalks that I
would be hesitant to consider for use. I would definitely want to see an
MSDS or assay for it.
- Steve N
-----Original Message-----
From: Annie B Smythe [mailto:anniebsmy...@gmail.com]
Sent: Tuesday, January 12, 2010 9:06 AM
To: silver-list@eskimo.com
Subject: Re: CS>Chemistry question ?
Thank you Steve:)
I've been looking for Magnesium Chloride so I can
make it up by the half gallon or gallon, and all
the 'grade' terminology is a little confusing. I
know pharmaceutical grade and food grade are ok
for consumption, and I figured lab grade would
have to be mostly pure, but I wasn't sure that
technical grade wasn't just another name for lab
grade, and what do they use technical grade for
anyway? I just don't want to use the wrong thing. :/
Annie
"Not everything that counts can be counted, and
not everything that can be counted counts." (Sign
hanging in Einstein's office at Princeton)
Norton, Steve wrote:
Here is a good source of info:
http://yarchive.net/chem/chemical_grades.html
I frequently use reagent grade chemicals internally. If you go to the
FDA definition of allowable pharmaceutical grade impurities you will
see
almost no difference between reagent and pharmaceutical grade
chemicals.
Actually pharmaceutical grade is often less stringent than reagent
grade. That is because reagent grade chemicals are often used in
making
pharmaceuticals.
A main issue is the amount of heavy metals in the chemical. Usually
you
can request a copy of an assay of the reagent or technical grade
chemical and see what if any heavy metals are present. If you use
chelators regularly (bentonite, ALA, chlorella, etc) you may not be as
concerned about heavy metals.
Reagent grade is a higher purity than technical grade. From thr
Sci-Tech
Encyclopedia:
"Commercial chemicals are available at several levels of purity.
Chemicals labeled "technical" or "commercial" are usually quite
impure.
The grade "USP" indicates only that the chemical meets the
requirements
of the United States Pharmacopeia. The term "CP" means only that the
chemical is purer than "technical." Chemicals designated "reagent
grade"
or "analyzed reagent" are specially purified materials which usually
have been analyzed to establish the levels of impurities. The American
Chemical Society has established specifications and tests for purity
for
some chemicals. Materials which meet these specifications are labeled
"Meets ACS Specifications."
I do use some technical grade chemicals where it is not possible or it
is difficult to get reagent grade. And I do use chelators. When
deciding
to use a technical grade I try to get a copy of an assay. If no assay
is available and the amount used is low and the purity is reasonably
high I might still use it. There is no absolute answer to your
question.
- Steve N
-----Original Message-----
From: Annie B Smythe [mailto:anniebsmy...@gmail.com]
Sent: Tuesday, January 12, 2010 5:08 AM
To: CS List
Subject: CS>Chemistry question ?
Question for chemistry knowing folks.
What's the difference between technical grade and
food grade? Is technical grade the same as lab
grade? And would technical grade magnesium
chloride powder to be unsafe to make a solution
from for a person to drink as magnesium
supplementation? Any impurities or anything?
Annie
--
The Silver List is a moderated forum for discussing Colloidal Silver.
Instructions for unsubscribing are posted at: http://silverlist.org
To post, address your message to: silver-list@eskimo.com
Address Off-Topic messages to: silver-off-topic-l...@eskimo.com
The Silver List and Off Topic List archives are currently down...
List maintainer: Mike Devour <mdev...@eskimo.com>
