Re: Their Lugol's is Reagent grade

There is a grade called "ACS Reagent" which has the same quality as ACS ... if this is what they have then they should state it. There is something else that a few companies, such as The Chemical Company, call Reagent Grade, with no mention of the ACS designation, and I am suspicious that it may not as pure as ACS or USP.

Below, under Reagent Grade, note the phrase "meets in-house established limits in the absence of any compendial reference for the given compound." This means that the company sets the standards for this Reagent Grade INTERNALLY. There is no common standard for it.

Here are the definitions of grades from another chemical company,
http://www.usbweb.com/reference2.asp?id_ref=1
:

ACS Reagent Grade: meets the limits of purity for inorganic chemicals as established by the American Chemical Society.

CP Grade (Chemically Pure): meets the requirements of the Food Chemicals Codex, but not intended for food use.

USBioAnalyzed: meets USP or NF chemical testing requirements but is not sold as USP or NF Grade; USP and NF Grades (United States Pharmacopeia and National Formulary) must meet the requirements of those compendia and will fall under this category.

USP Grade: meets the requirements of the U.S. Pharmacopeia.
NF Grade: meets the requirements of the National Formulary.

MB Grade (Molecular Biology): applies to products that are suitable for a variety of Molecular Biology applications including those which require ultra-low levels of trace metal contamination, and low levels of DNase's, RNase and protease. These products are also functionally tested when applicable.

Reagent Grade: suitable for use in general laboratory applications; meets in-house established limits in the absence of any compendial reference for the given compound. In-house established limits and their associated test methods are in many cases derived from common compendial methods such as USP, NF, ACS, etc.

High Purity Grade: generally meets more stringent requirements than Reagent Grade products, such as higher purity limits or lower levels of trace contaminants. When available, this grade is more suitable as a reference material than the Reagent Grade.
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