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>
