Rule AX-R12
Main-peak asymmetry above 1.50 at 10 % height. The trailing boundary is then drawn by judgement rather than by geometry, which makes the reported purity a range rather than a number. Asymmetry is a column finding: a re-injection on a fresh column usually clears it.
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.
- Drop-line integration
- Separating two overlapping peaks with a vertical line dropped from the valley between them. Unbiased when the peaks are of comparable size.
see also Rule AX-R12
see also Valley-to-valley integration · Tangent skim
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