114562 Potassium Cell Test Spectroquant, Merck

The Potassium Cell Test (1.14562) utilizes the turbidimetric method. In an alkaline solution, potassium ions react with Kalignost® (sodium tetraphenylborate) to form a slightly soluble precipitate. The resulting turbidity is proportional to the concentration of potassium and is measured photometrically. As part of the Spectroquant® system, these cells are equipped with a unique Live ID (2D barcode), which automatically selects the correct method on Spectroquant® Prove, Nova, and Move photometers, ensuring high reliability and ease of use.

Advantages

• Ready-to-use: Pre-filled 16 mm round cells minimize preparation time and reduce handling errors.
• High precision: Measuring range of 5.0 – 50.0 mg/L K ensures accurate results for low-to-medium concentrations.
• Automated recognition: Live ID provides automatic method detection, lot information, and calibration updates.
• Versatile application: Suitable for drinking water, ground water, surface water, mineral water, and waste water.
• Compliance: Calibrated against NIST-traceable standards for audit-ready laboratory procedures.

Instructions for use

Ensure the sample pH is between 3 and 12 (adjust with sodium hydroxide or sulfuric acid if necessary). Pipette 2.0 mL of the pretreated sample into a reaction cell and mix. The pH in the cell must be between 10.0 and 11.5. Add 6 drops of Reagent K-1K and mix, then add one level microspoon of Reagent K-2K and shake to dissolve. Allow the reaction to proceed for exactly 5 minutes. Measure the sample in the photometer immediately after the reaction time. Note: The turbidity is stable for only a short duration; results may increase by 5-7% per minute if measurement is delayed.

Technical specifications

Available packaging options