HI-4111 Iodine Combination Electrode

The silver iodide sensing pellet produces a potential change due to the iodide ion exchange between the inorganic pellet membrane and the sample. The internal sensing elements are housed within a durable polyetherimide (PEI) body.

The HI-4111 is ideal for a variety of applications in food production and environmental monitoring.

As an Iodide combination ISE, it is ideal for the determination of free Iodide ions in emulsified food samples (iodised table salt), plants and for titration.

• Solid state sensor
• Skirted cone geometry
• Detection from 0.01 to 127,000 mg/L I-

The HI-4111 iodide selective electrode is a complete potentiometric cell that contains a silver/silver chloride (Ag/AgCl) reference housed within a PEI plastic body with a potassium nitrate electrolyte. The internal elements are isolated from the sample by a compressed silver iodide sensing membrane.

Hanna’s solid state 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 HI-4111 to measure iodide accurately, it is important that the ionic strength of the standards and sample be adjusted to a high and constant value with the halide ionic strength adjuster (ISA) solution. The halide ISA ensures that the activity coefficient is constant so the concentration of free iodide ions can be measured. Measuring all solutions with a constant ionic strength reduces the margin of error between measurements. The HI-4111 iodide solid state ISE can measure from 0.1µM (0.01 mg/L) to1M (127,000 mg/L).