Soil Proficiency Test Schedule
| 2024 SM Soil PT Study Schedule | ||
| Study Number | Study Opens | Study Closes |
| SM-140 | Feb. 6, 2024 | March 21, 2024 |
| SM-141 | March 26, 2024 | May 9, 2024 |
| SM-142 | Aug. 20, 2024 | Oct. 3, 2024 |
| SM-143 | Oct. 21, 2024 | Dec. 4, 2024 |
Analyte
| Aluminum | 2500-25000 mg/kg | Antimony | 80.0-300 mg/kg |
| Arsenic | 40.0-400 mg/kg | Barium | 100-1000 mg/kg |
| Beryllium | 40.0-400 mg/kg | Boron | 80.0-800 mg/kg |
| Cadmium | 40.0-400 mg/kg | Calcium | 1500-25000 mg/kg |
| Chromium | 40.0-400 mg/kg | Cobalt | 40.0-400 mg/kg |
| Copper | 40.0-400 mg/kg | Iron | 5000-50000 mg/kg |
| Lead | 40.0-400 mg/kg | Manganese | 100-2000 mg/kg |
| Magnesium | 1200-25000 mg/kg | Molybdenum | 30.0-300 mg/kg |
| Mercury | 1.00-35.0 mg/kg | Selenium | 40.0-400 mg/kg |
| Nickel | 40.0-500 mg/kg | Silver | 20.0-100 mg/kg |
| Potassium | 1400-25000 mg/kg | Sodium | 150-15000 mg/kg |
| Strontium | 40.0-400 mg/kg | Thallium | 40.0-400 mg/kg |
| Tin | 50.0-250 mg/kg | Titanium | 100-400 mg/kg |
| Vanadium | 40.0-400 mg/kg | Zinc | 100-1000 mg/kg |
| Lithium | 150-2000 mg/kg |
