The phrase "a solution of internal" is not correct and lacks clarity in written English.
It may be intended to describe a solution related to internal processes or issues, but it needs additional context to be meaningful.
Example: "We need to develop a solution of internal communication to improve team collaboration."
Alternatives: "an internal solution" or "a solution for internal matters".
For calibration, solutions of IB (5, 12.5, 25, 50, 125, 500 and 1,250 μg/ml) and a solution of an internal standard IND (25 μg/ml) in methanol were used.
These solutions were mixed in a ∼1 9 ratio with a solution of BGE, internal standard, and BBL broth (spun at 14000 rpm for 10 min with a 30 kDa spin filter) for a final solution of ∼10% sample and 0.5% broth.
A solution of allose as internal standard is added to give a final concentration of 20 ppm in the injection volume.
This is why we hope for a solution, of course, of the internal problems, because we need this leadership".
Each 100 μL of blood sample was diluted 10 times with a known concentration of aqueous solution of internal standard (which was prepared by dissolving sodium chloride in distilled water then added to propanol) and the blood sample and the internal standard were immediately ejected into a glass vial which was fitted with a Teflon-lined stopper and air tightened to be ready for HS analysis.
The concentration of the working solution of internal standards mixture used was 10 ng/mL.
The stock solution of internal standard, isoimperatorin was also dissolved in methanol and diluted with methanol to a final concentration of 1 μg mL−1 and stored at 4 °C until analysis.
Stock solution of internal standard (1.0 mg mL−1) was prepared in water.
Then 50 µL of 400 ng mL−1 solution of internal standard mixture (10 deuterated labeled compounds) was added to the extraction mixture.
Solution of internal standards (Diethyl phthalate-d4 e Bis(2 ethylhexyl) phthalate-d4) in hexane was supplied by Supelco, Milano, and used for all analysis.
