Electrochemical methods refer to a series of analytical techniques involving electron transfer in a solution, by
analyzing the magnitude of the current to determine the identity and concentration of a given analyte. The four main
categories of electrochemical methods are potentiometry, voltammetry, coulometry, and impedancemetry. These
analytical methods are rapid and accurate, offering a valuable option to meet industrial demands in the measurement
of pH, ISE (ion selectivity), EC (electrical conductivity) and DO (dissolved oxygen). Learn More
pH meter
A pH meter is an instrument used to measure hydrogen ion activity in solutions - in other words, this instrument
measures acidity/alkalinity of a solution.
Test principle: The pH measurements are made by comparing the pH reading of a sample solution to that of
a reference solution with defined pH, such as buffers.
Applications: pH meter is an essential component of science, and it has a big impact on our lives. It can
be used in but not limited to the following industries: food & beverage, pharmaceutical, oil & gas,
agriculture, water treatment.
ISE meter
An ion selective electrode (ISE) meter is an instrument used to determine the activity of ions in aqueous
solution by measuring the electrical potential.
Test principle: At equilibrium, there is potential difference existing between two sides of the ion
selective membrane. The relationship between potential difference and ion concentration can be determined by
measuring the potential of two solutions of already-known ion concentration and a plot based on the measured
potential and logarithm of the ion concentration.
Applications: ISE meter has a wide variety of applications. For example, ISE meter finds its use in
pollution monitoring in natural waters (CN-, F-, Cl-, etc.), food processing (NO3-, NO2- in meat
preservatives), Ca2+ in dairy products, and K+ in fruit juices, etc.
EC meter
An electrical conductivity (EC) meter measures the electrical conductivity in a solution.
Test principle: It is calculated by the ability of a substance to transmit an electrical current over a
defined area.
Applications: EC meter can be used in but not limited to the following aspects: natural waters,
aquaculture, water treatment, agriculture, and environmental applications.
DO meter
A dissolved oxygen (DO) meter basically measures the concentration of oxygen in water.
Test principle: DO meter works by measuring the amount of oxygen that diffuses through a permeable (or
semi-permeable) membrane into the probe (sensor). Once the oxygen enters the sensor, a chemical reduction
reaction occurs, producing an electrical signal which can be read by the DO probe and displayed on the
meter.
Applications: DO meter is mostly used in groundwater remediation, wastewater, aquariums, and fish
hatcheries.
Alfa Chemistry's Electrochemical Meters
Alfa Chemistry is a leading supplier of electrochemical water quality analysis instruments and electrochemical
sensors. Click the links below to know more about our various professional electrochemical meters.
Alfa Chemistry is a high-tech company integrating R&D, production, sales, application and services. We aim to improve
people's life by providing high-tech analytical instruments and high-quality services. For more information about
our water quality meters and laboratory instruments, please feel free to contact us.
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