Metrohm has launched its Unitrode - a combination glass electrode that has been designed for a range of applications and industries.
These include: beverage; pharmaceutical; environmental; dyes and inks; electroplating; and emulsions.
From difficult samples, such as dyes, inks, resins, polymers, beverages, and suspensions to basic 'easy-to-measure' applications, the Unitrode provides good performance and stability in industry and academia.
The Unitrode can cope with rough measuring conditions and temperatures up to 100C.
Due to its more defined electrolyte flow and minimised blockage, the electrolyte diaphragm of choice for precision pH measurements is the sleeve diaphragm, which offers a reliable and precise measuring system.
With a fixed-sleeve design that creates a sharp and well-defined interface between the sample and the sleeve, the possibility of sample carryover is greatly reduced, minimising cross-contamination and memory effects.
The fixed ground-sleeve diaphragm itself is resistant to dirt and particles.
In addition, its annular design ensures that there is only a small difference in observed pH values between a stirred and an unstirred solution.
This aspect is particularly important for pH measurements in more difficult samples since they usually have to be stirred during the analysis to maintain consistency.
The Unitrode also uses the Metrohm 'Long Life' reference system with the Ag/AgCl cartridge with its silver ion barrier to ensure an extended life and consistent measurements.
All Unitrodes have a cylindrical pH glass membrane manufactured from green U-glass, which is tolerant of high temperatures and highly alkaline samples and shows a good response with sample measurements with a pH of 14.
Metrohm Unitrodes can also be used in partial non-aqueous media up to 10 per cent.
