This PT is obtained from naturally occurring surface waters. The only analytes added are Fluoride and Nitrate. Although participants may use their method of choice for participation, caution should be taken when using colorimetric procedures as some samples may have a natural colour.
| Analyte | Concentration Range |
|---|---|
| Alkalinity to pH 4.5 | 20 – 250 mg/L |
| Chloride | 5 – 500 mg/L |
| Conductivity at 25oC | 20 – 2000 µS/cm |
| Calcium | 2 – 200 mg/L |
| Magnesium | 2 – 50 mg/L |
| Fluoride | 0.2 – 4.0 mg/L |
| Hardness as CaCO3 | 10 – 800 mg/L |
| Inorganic Carbon | 10 – 100 mg/L |
| Nitrate | 0.20 – 20.0 mg/L |
| Nitrate plus Nitrite | 0.20 – 20.0 mg/L |
| Potassium | 1 – 40 mg/L |
| Reactive Silica | 0.5 – 30 mg/L |
| Sodium | 5 – 200 mg/L |
| Sulphate | 5 – 200 mg/L |
This PT is obtained from naturally occurring surface waters. The only analytes added are Fluoride and Nitrate. Although participants may use their method of choice for participation, caution should be taken when using colorimetric procedures as some samples may have a natural colour.