Chemical purity is defined as the absence of foreign substances and specified concentration thresholds of impurities
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Reference materials establish that chemical purity involves the absence or minimization of other chemical species, with acceptable impurity levels defined by established standards and grading systems.
Chemical impurity
In chemistry and materials science, impurities are chemical substances inside a confined amount of liquid, gas, or solid. They differ from the chemical composition of the material or compound. Firstly, a pure chemical should appear in at least one chemical phase and can also be characterized by its phase diagram. Secondly, a pure chemical should prove to be homogeneous(i.e., a uniform substance that has the same composition throughout the material). The perfect pure chemical will pass all attempts to separate and purify it further. Thirdly, and here we focus on the common chemical definition, it should not contain any trace of any other kind of chemical species. In reality, there are no absolutely 100% pure chemical compounds, as there is always some small amount of contamination.
The levels of impurities in a material are generally defined in relative terms. Standards have been established by various organizations that attempt to define the permitted levels of various impurities in a manufactured product. Strictly speaking, a material's level of purity can only be stated as being more or less pure than some other material.
Impurities are either naturally occur
Chemical purity
Aluminium trichloride hexahydrate, white and yellow
In chemistry, chemical purity is the measurement of the amount of impurities found in a sample. Several grades of purity are used by the scientific, pharmaceutical, and industrial communities. Some of the commonly used grades of purity include:
- ACS grade is the highest level of purity, and meets the standards set by the American Chemical Society(ACS). The official descriptions of the ACS levels of purity is documented in the Reagent Chemicals publication, issued by the ACS. It is suitable for food and laboratory uses.
- Reagent grade is almost as stringent as the ACS grade.
- USP grade meets the purity levels set by the United States Pharmacopeia(USP). USP grade is equivalent to the ACS grade for many drugs.
- NF grade is a purity grade set by the National Formulary(NF). NF grade is equivalent to the ACS grade for many drugs.
- British Pharmacopoeia: Meets or exceeds requirements set by the British Pharmacopoeia(BP). Can be used for food, drug, and medical purposes, and also for most laboratory purposes.
- Japanese Pharmacopeia: Meets or exceeds requirements set by the Japanese Pharmacopoeia(JP). Can be used
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