| Input values for your sample material (see list below for examples) | Enter values here |
|---|---|
| percent nitrogen (%N) | % |
| percent carbon (%C) | % |
| Acceptable range of sample weights | Smallest sample weight (mg) | Your optimal sample weight (mg) | Largest sample weight (mg) | Your optimal sample contains: |
|---|---|---|---|---|
| For 15N analysis | 1.00 | 5.00 | 7.50 | 100µg N; 2000µg C |
| For 13C analysis | 0.50 | 1.25 | 5.00 | 500µg C |
| For dual isotope analysis (15N + 13C)* | 1.00 | 4.00 | 5.00 | 80µg N; 1600µg C |
| C:N of your sample* = | 20.0 | |||
*13C and 15N can be measured on a single sample only if the C:N value is less than 100
Examples of %N and %C of sample materials:
| Sample Material | %N | %C |
|---|---|---|
| Plant - leaves | 2-3% | 42-50% |
| Plant - roots | 0.8-1.3% | 36-40% |
| Plant - stems | 0.4-0.8% | 46-48% |
| Plant - wood | 0.02-0.06% | 40-44% |
| Plant - grain flour (wheat, rye, rice) | 1.5-3.5% | 43-47% |
| Plant - grass, alfalfa | 2.5-5% | 45-47% |
| Soil - low OM | 0.1-0.15% | 0.8-1.2% |
| Soil - medium OM | 0.2-0.3% | 2.5-3.5% |
| Soil - high OM | 0.3-1.0% | 10-14% |
| Sediment - bulk | 0.05-0.15% | 0.5-1.5% |
| Animal, Fish, Invertebrate tissue | 10% | 40% |
| Human Hair | 14% | 47% |