A reliable and versatile solution for your ionic measurements – LL ISE Metrohm
The LL ISE reference electrode developed by Metrohm is a high-quality analytical solution designed to meet the growing demands of modern laboratories for precision, reliability, and automation. Used in a wide range of applications, this electrode is an indispensable tool for potentiometric measurements, including ion-selective electrode (ISE) analyses, surfactant titrations, and numerous automated applications in chemical, environmental, and industrial analysis laboratories.
The LL ISE is based on a double junction system with an internal silver/silver chloride (Ag/AgCl) electrode, ensuring optimum electrochemical stability even under complex measurement conditions. This double junction system is essential for limiting the risk of cross-contamination between the sample solution and the reference electrolyte, which extends the electrode's service life while ensuring greater reproducibility of results.
One of the distinguishing features of this electrode is its ground-sealed membrane, also known as a diaphragm. Unlike conventional membranes, this membrane is specially designed to be insensitive to contamination, even in the presence of complex sample matrices. It allows for a constant and reproducible flow of electrolyte, an essential condition for maintaining a stable reference potential over time.
The electrolyte used in the LL ISE electrode is potassium chloride at a concentration of 3 mol/L, supplied in gel form. This gel formulation plays a crucial role in reducing unwanted diffusion currents and improves the stability of the measurement signal. However, the electrode design allows easy replacement of the electrolyte with other compatible solutions, such as KNO₃ or TEABr, depending on the specific requirements of the analysis to be performed.
The LL ISE electrode is a strategic choice for laboratories seeking performance, flexibility and durability. Its compatibility with automation systems, high signal stability and resistance to contamination make it a benchmark component in the field of ion measurement and demanding titrations.
