Drinking Water Chemistry WS Proficiency Study Schedule
2024 WS Drinking Water Chemistry PT Study Schedule | ||
Study Number | Study Opens | Study Closes |
WS-137 | Jan. 8, 2024 | Feb. 21, 2024 |
WS-138 | April 3, 2024 | May 17, 2024 |
WS-139 | July 2, 2024 | Aug. 15, 2024 |
WS-140 | Oct. 15, 2024 | Nov. 28, 2024 |
Analyte
Nitrate as N | 3.0 – 10 mg/L |
Nitrate+Nitrite as N (Total Nitrogen) | 3.0 – 10 mg/L |
Potassium | 10 – 40 mg/L |
Chloride | 20 – 160 mg/L |
Sulfate | 25 – 250 mg/L |
Fluoride | 1.0 – 8.0 mg/L |
Alkalinity (as CaCO3) | 25 – 200 mg/L |
Specific Conductance | 130 – 1300 umhos/cm |
Total Filterable Residue (TDS at 180°C) | 100 – 1000 mg/L |