| UNSPSC Code | 41116116 |
|---|---|
| Web Name Override | Total Hardness Test, photometric |
| NACRES | NA.24 |
| product line | Spectroquant® |
| usage | sufficient for 25 tests |
| specific analyte(s) | calcium |
| measuring range | 12-537 mg/L (CaCO3) |
| water hardness measuring range | 0.7-30.1 °d |
| technique(s) | photometry: suitable |
| application(s) | aquaculturedrinking waterground and surface watermineral waterminingpower plants |
| compatibility | for use with Spectroquant® Move 100 |
| detection method | photometric (Phthalein complexone) |
| storage temp. | 15-25°C |
| Quality Level | 100 |
Answer:The measurement range is 12–537 mg/L as CaCO₃, equivalent to 5–215 mg/L when expressed as calcium.
Answer:Each package provides materials for 25 photometric total-hardness determinations.
Answer:No. The method determines total hardness associated principally with calcium and magnesium ions, rather than a calcium-only result.
Merck Spectroquant Total Hardness Cell Test determines the combined calcium- and magnesium-related hardness of water through a photometric complexation reaction. Its stated range is 12 to 537 mg/L expressed as calcium carbonate, corresponding to 5 to 215 mg/L expressed as calcium. The test also supports hardness reporting in common regional degree scales when the relevant conversion is applied. In a neutral reaction medium calcium and magnesium form a violet complex with phthalein complexone, which is measured with a compatible Spectroquant photometer. Each kit provides sufficient prefilled 16 mm round cells and reagents for 25 determinations. The method is useful for monitoring drinking water, mineral water, boiler feed and process water after checking that the sample matrix is suitable. Calibrate and verify the measuring system using appropriate quality-control materials, and dilute samples that exceed the validated range. Keep cell surfaces clean, follow prescribed mixing times and avoid contaminating reagents with concentrated salts. Store at 15–25 °C and observe the chemical safety instructions.
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