: Even 0.1% impurity can compromise data; the COA documents trace metal levels or moisture content to prevent experimental failure.
A standard Uni-Chem CoA is divided into several sections designed for full traceability and quality verification: Product Identification: uni-chem chemical reagents certificate of analysis
| Test | Specification | Result | Method Reference | | :--- | :--- | :--- | :--- | | | White crystalline powder | Conforms | Visual Inspection | | Assay (dry basis) | ≥ 99.5 % | 99.8 % | Titration (USP) | | Identification (IR) | Matches reference standard | Conforms | FTIR | | pH (5% solution, 25°C) | 6.5 – 8.0 | 7.2 | Potentiometric | | Loss on Drying | ≤ 0.5 % | 0.2 % | Gravimetric (105°C) | | Residue on Ignition | ≤ 0.1 % | 0.05 % | Furnace (800°C) | | Chloride (Cl) | ≤ 0.01 % | < 0.005 % | Ion Chromatography | | Sulfate (SO₄) | ≤ 0.01 % | < 0.005 % | Turbidimetric | | Heavy Metals (as Pb) | ≤ 5 ppm | < 2 ppm | ICP-OES | | Iron (Fe) | ≤ 2 ppm | < 1 ppm | Colorimetric | | Water (H₂O) | ≤ 0.2 % | 0.12 % | Karl Fischer | : Even 0
The voice came from the doorway. It was Silas, the Quality Control Manager. Silas was a man who looked like he had been carved out of a stop sign—rigid, red-faced, and always ready to make you halt. Silas was a man who looked like he
: If an experiment fails, checking the COA helps determine if a slight variation in a reagent lot was the cause.