Calculator Inputs
Enter analytical, recovery, compliance, and dietary values. Results will appear above this form after submission.
Formula Used
Extract Concentration (mg/L) = ((Instrument Response − Intercept) ÷ Slope) × Dilution Factor
Mass in Final Solution (mg) = Extract Concentration × Final Volume (L)
Measured Residue (mg/kg) = [Mass in Final Solution × (Extract Volume ÷ Aliquot Volume)] ÷ Sample Weight (kg)
Corrected Residue (mg/kg) = Measured Residue ÷ (Recovery % ÷ 100)
Estimated Daily Intake (mg/day) = Corrected Residue × Daily Food Intake
EDI (mg/kg bw/day) = Estimated Daily Intake ÷ Body Weight
Hazard Quotient = EDI ÷ ADI
Keep units consistent. Weights are entered in grams, volumes in milliliters, calibration concentration in mg/L, and residue limits in mg/kg.
How to Use This Calculator
- Enter the sample, commodity, and pesticide names for your report.
- Provide sample weight, extraction volume, aliquot volume, and final diluted volume.
- Add instrument response, calibration slope, intercept, and any dilution factor.
- Enter recovery, MRL, LOD, LOQ, food intake, body weight, and ADI.
- Click Calculate Residue to display the result above the form.
- Use the CSV or PDF buttons to export the current analytical report.
Example Data Table
| Sample | Commodity | Response | Slope | Intercept | Recovery % | MRL (mg/kg) | Corrected Residue (mg/kg) | Status |
|---|---|---|---|---|---|---|---|---|
| Sample A | Apple | 950 | 2500 | 50 | 90 | 0.500 | 0.320 | Within MRL |
| Sample B | Tomato | 1200 | 3000 | 0 | 85 | 0.500 | 0.941 | Exceeds MRL |
| Sample C | Spinach | 420 | 2600 | 35 | 92 | 0.200 | 0.078 | Within MRL |
FAQs
1. What does recovery-corrected residue mean?
It adjusts the measured residue using method recovery. This helps compensate for analyte losses during extraction, cleanup, and final preparation steps.
2. Can I compare the result directly with an MRL?
Yes. Enter the applicable MRL for that pesticide and commodity. The calculator then reports the percent of MRL and the compliance status.
3. Which units should I use?
Use grams for sample weight, milliliters for volumes, mg/L for calibration concentration, and mg/kg for residue, LOD, LOQ, and MRL values.
4. Why do I need calibration slope and intercept?
They convert instrument response into solution concentration. Without a proper calibration equation, the residue estimate cannot be calculated correctly.
5. What happens when residue is below LOD or LOQ?
The tool labels results below LOD as non-detects. Results between LOD and LOQ are detected, but not considered fully quantifiable.
6. What does hazard quotient show?
It compares body-weight adjusted exposure with the acceptable daily intake. Values below one usually indicate exposure below the entered ADI threshold.
7. Is this calculator enough for regulatory submission?
No. It is a reporting and screening aid. Validated methods, matrix effects, quality controls, and official regulatory interpretation still matter.
8. Can I export the result after calculation?
Yes. After calculation, use the CSV or PDF buttons to save the current inputs and outputs for documentation or internal review.