The phrase "a pure sample of" is correct and usable in written English.
It can be used when referring to a sample that is uncontaminated or represents a specific substance or quality without any impurities.
Example: "In our experiment, we need to ensure that we are working with a pure sample of the chemical compound to obtain accurate results."
Alternatives: "an untainted sample of" or "a clean sample of".
To isolate a pure sample of this gas, he tried heating different substances, such as mercury oxide, and black magnesia.
At the Kaiser Wilhelm Institute (now Max Planck Institute), Berlin (1933 35), he worked with Otto Warburg in isolating from yeast a pure sample of the "old yellow enzyme," which is instrumental in the oxidative interconversion of sugars by the cell.
Prior to the encapsulation of RT21®, the properties of a pure sample of RT21® were verified in duplicate.
Ind. CO. (Alexandria, Egypt) kindly supplied a pure sample of alendronate sodium trihydrate (with a purity of 100.55% as determined by the comparison method [7]) (Batch # AAS0400010).
According to the final report prepared by P2A, the operator walks about the field, comparing the magnetic resonance of a pure sample of contaminants contained in the box with magnetic resonances he senses at the site.
where [FLZ] is the molar concentration of the guest, Δδobs the observed chemical shift change for a given [FLZ] concentration, Δδmax the chemical shift change between a pure sample of complex and the free component at saturation.
In the first spectrum recorded, the solid phase is identified as a virtually pure sample of the β polymorph (with a very small amount of the α polymorph also present).
After four column chromatography steps, a >90% pure sample of MDH was obtained with a typical yield of ∼30 mg/L.
Then, in a first, in 1940, scientists at Columbia used the machine to fire subatomic particles at a very pure sample of uranium and identified its fissionable form.
Marignac separated (1880) a new rare earth (metallic oxide) from the mineral samarskite, and Lecoq de Boisbaudran obtained (1886) a fairly pure sample of the same earth, which with Marignac's assent he named gadolinia, after a mineral in which it occurs that in turn had been named for the Finnish chemist Johan Gadolin.
We have computed these probabilities for a sufficiently pure sample of the particular functionalized CNT.
