100961 Total Hardness Cell Test, photometric, 0.7 – 30.1 °d, Spectroquant, Merck

The Total Hardness Cell Test (1.00961) provides a convenient method for measuring the concentration of alkaline earth metal ions—primarily calcium and magnesium—which constitute water hardness. The method is based on the reaction of these ions with phthalein purple in a neutral solution to form a violet dye, which is then measured photometrically. As a "Cell Test," it comes with prefilled 16 mm round cells, significantly reducing preparation time and reagent handling. A unique feature of this kit is the ability to differentiate between calcium and magnesium concentrations using a specific masking agent. Each cell is equipped with a Live ID barcode for automatic method recognition, lot tracking, and expiry date verification on compatible Spectroquant® instruments.

Advantages

• Convenient Format: Prefilled 16 mm round cells minimize reagent handling and laboratory errors.
• High Precision: Accurate quantification across a broad range of hardness units (°d, °e, °f, mg/L $CaCO_3$).
• Live ID System: Automatic method recognition and calibration updates via 2D barcode for seamless workflow.
• Analyte Differentiation: Allows for the separate determination of calcium and magnesium within the same sample.
• Compliance: Standard-analogous method ensures reliable results for regulated water analysis.
• Versatile Application: Ideal for drinking water, mineral water, ground water, and boiler water monitoring.

Technical specifications