Rule AX-R12
Peak asymmetry above 1.50 or resolution below 1.20 to the nearest impurity. Makes the reported purity a range rather than a number.
Related terms
- Asymmetry factor (As)
- Peak shape measure taken at 10 % of peak height: the width of the rear half divided by the width of the front half. Symmetric = 1.00. Above 1.50 the index marks integration unreliable.
- Resolution (R)
- Separation between two peaks: R = 2(t₂ − t₁)/(w₁ + w₂). R = 1.5 is baseline resolution. The index requires R ≥ 1.20 to the nearest named impurity.
see also Rule AX-R12
see also Rule AX-R12 · Valley
Where this term appears
The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.
- Assay report records — the term appears in result tables, peak tables and provenance blocks
- Method references — where the measurement behind the term is defined
- All 37 glossary terms beginning with R