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Fluoride Combination Ion Selective Electrode (ISE) HI4110
The HI4110 is a solid state, combination ion selective electrode (ISE) for the determination of fluoride (F-) in solution. The lanthanum fluoride crystal membrane produces a potential change due to the fluoride ion exchange between the membrane and the sample. The internal sensing elements are housed within a durable body, composed of a mixture of polyetherimide (PEI) and epoxy. The HI4110 is ideal for a variety of applications in drinking water treatment, environmental monitoring, and plating baths.
- Solid state sensor
- Skirted cone geometry
- Detection from 0.02 mg/L to saturated F-
|Note||Heated transport required during winter months.|
|Type||solid state; combination|
|Optimum pH Range||5 to 8|
|Temperature Range||0 to 80°C|
|Cable||1 m coaxial|
|Common Applications||determination of free fluoride in potable water, soft drinks, wine, plants, emulsified food products, plating and pickling acids|
The HI4110 fluoride selective electrode is a complete potentiometric cell that contains a silver/silver chloride (Ag/AgCl) reference housed within a PEI/epoxy body with a potassium nitrate/potassium chloride electrolyte. The internal elements are isolated from the sample by a lanthanum fluoride crystal 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 HI4110 to accurately measure total fluoride concentration, it is important that the pH and ionic strength of the standards and sample be adjusted to a constant value. The total ionic strength adjustment buffer (TISAB) ensures that the solution pH is between pH 5 and 8 and that the activity coefficient is constant. The TISAB solution also preferentially complexes with various metal ions, such as aluminum and iron, which tend to form complexes with fluoride ions. TISAB thus ensures that these metal ions do not interfere, permitting an accurate total fluoride measurement. Measuring all solutions with a constant pH and ionic strength reduces the margin of error between measurements. The HI4110 fluoride solid state ion selective electrodes can measure from 1µM (0.02 mg/L) to saturated F-.