The phrase "adding an aliquot of" is correct and usable in written English.
It is typically used in scientific or technical contexts, particularly in chemistry or biology, to refer to the addition of a specific, measured portion of a substance to a solution or mixture.
Example: "In the experiment, we will be adding an aliquot of the reagent to the solution to initiate the reaction."
Alternatives: "adding a portion of" or "adding a sample of".
The required substrate concentration in the working buffer was achieved by adding an aliquot of the stock substrate solution.
The sensing begins by adding an aliquot of an aqueous solution of Hg2+ at a designated concentration to a solution of the Ag nanoparticles at room temperature.
Once ABTS radical cation (ABTS+) was formed, the reaction was started by adding an aliquot of the sample.
Three of those samples were spiked on one medium concentration level by adding an aliquot of the multi-analyte stock solution prior to extraction.
A positive control was prepared by adding an aliquot of purified WT lysozyme to the supernatant of the Drosophila w control line.
The temperature sensitive phage, phAE87 [ 129] containing pMycoMar [ 130] was prepared by adding an aliquot of late log phase M. smegmatis to Nutrient Broth II top agar with an appropriate number of phage such that the resultant plaques were touching.
To reduce the diffusion of soluble enzymes in the medium, we added an aliquot of 6% agar.
The powder is dispensed in a two part capsule to which is added an aliquot of hydration liquid, composed of water, calcium chloride, and a water reducing agent.
We added an aliquot of each cDNA reaction to each Taqman master mix reaction along with the appropriate primer and probe set purchased from Applied Biosystems per the manufacturer's protocol (Applied Biosystems).
A protein mixture was prepared by mixing equal amounts of the stock solutions and adding an extra aliquot of water to achieve a tenfold dilution.
A nitric acid/hydrofluoric acid mixture was added to an aliquot of the homogenized sample and then taken to dryness.
