The HI4114 is a liquid membrane, combination ion selective electrode (ISE) for the determination of potassium (K+) in solution. The PVC membrane comprised with organic ion exchanger produces a potential change due to the potassium ion exchange between the organic polymer membrane and the sample. The internal sensing elements are housed within a durable polyetherimide (PEI) body. The HI4114 is ideal for a variety of applications in wine, agriculture, and water analysis.
Liquid membrane sensor
Skirted cone geometry
Detection from 0.039 to 39,100 mg/L K+
The HI4114 potassium ion selective electrode is a complete potentiometric cell that contains a silver/silver chloride (Ag/AgCl) reference housed within a PEI plastic body with a sodium chloride electrolyte. The internal elements are isolated from the sample by an organic polymer sensing membrane.
Hanna’s liquid membrane combination ISEs are designed with a cone style junction. The skirted cone geometry of the sensor forms the liquid junction with the test solution at the tip of the junction cone, producing a highly stable reference potential and consistent flow rates of electrolyte into the solution. A simple press of the top portion of the ISE makes it easy to empty the electrolyte fill solution and replace when necessary.
For the HI4114 to measure potassium accurately, it is important that the ionic strength of the standards and sample be adjusted to a high and constant value with the potassium ionic strength adjuster (ISA) solution. The ISA ensures that the activity coefficient is constant so the concentration of free potassium ions can be measured.