CS6710A Fluoride Ion Electrod Online Digital F- Cl- Ca2+ NO3- NH4+ K+ Hardness

Short Description:

The Fluoride Ion-Selective Electrode (ISE) is a highly specialized and reliable electrochemical sensor designed for the direct potentiometric measurement of fluoride ion (F⁻) activity in aqueous solutions. It is renowned for its exceptional selectivity and is a standard tool in analytical chemistry, environmental monitoring, industrial process control, and public health, most notably for optimizing fluoridation in drinking water.
The core of the electrode is a solid-state sensing membrane typically composed of a single crystal of lanthanum fluoride (LaF₃). When in contact with a solution, fluoride ions from the sample interact with the crystal lattice, generating a measurable electrical potential across the membrane. This potential, measured against an internal reference electrode, is logarithmically proportional to the fluoride ion activity according to the Nernst equation. A critical prerequisite for accurate measurement is the addition of a Total Ionic Strength Adjustment Buffer (TISAB). This solution serves three vital functions: it maintains a constant pH (usually around 5-6), fixes the ionic background to prevent matrix effects, and contains complexing agents to liberate fluoride ions bound by interfering cations like aluminum (Al³⁺) or iron (Fe³⁺).
The key advantages of the fluoride electrode are its excellent selectivity over other common anions, broad dynamic range (typically from 10⁻⁶ M to saturated solutions), fast response, long lifespan, and low operational cost. It enables rapid analysis without complex sample preparation or colorimetric reagents. Whether used in portable meters for field testing, laboratory benchtop analyzers, or integrated into online monitoring systems, the fluoride ISE remains the method of choice for accurate, efficient, and continuous fluoride quantification.