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Composite electrode-aqueous ion


Aqueous ion composite electrode is a new type of composite electrode improved from the existing two electrodes-ion selective electrode and reference electrode. Not only the accuracy is greatly improved, but also the operation is simple, no professional knowledge is required, and no relevant operating experience is required. Personnel can also use it easily; the aqueous solution ion composite electrode also has a small sample amount of the tested solution, and can measure the amount of ions on the surface of the object at the same time. The reference electrode does not need to add electrolyte solution, the liquid junction potential is stable, easy to install, and the electrode performance is stable , Reliable use and other characteristics.

Operating mode:

The solution ions are adsorbed by the diaphragm to produce a potential difference, and the electrical signal is transmitted by the wire. At the same time, the reference electrode provides a stable reference potential value (the potential value does not change). When the solution concentration changes, it will cause the diaphragm potential value to change, so it can Determine the concentration of the solution by detecting the potential value. The internal reference electrode forms a loop through ceramic points for ion exchange.


The aqueous solution composite electrode is divided into PVC membrane and crystal membrane ion detection electrodes.
PVC membrane :
Applicable ions: potassium ion electrode, calcium ion electrode, sodium ion electrode, nitrate ion electrode.
Features:PVC ion exchange membrane has the advantages of simple preparation, easy film formation, good selectivity, wide linear range and high service life. PVC membrane has a good effect on ion sensing.
crystal membrane:
Applicable ions: chloride ion electrode, copper ion electrode, cyanide ion electrode, cadmium ion electrode, fluorine ion electrode, bromine ion electrode, silver sulfur ion electrode.
Features:The crystal membrane can be measured intermittently at
80 ° C, with a long service life of 3-5 years, and the membrane material is relatively simple and easy to obtain, so it is more suitable for practical use.


(1) High sensitivity, fast measurement, whole body waterproof
The measurement has a wide linear range, fast response speed, high sensitivity, and continuous automatic determination and analysis.
(2) Less affected by environmental factors
The amount of analysis test solution is small, and it is less affected by environmental factors such as water quality, color and turbidity.
(3)Visual display of data
Simple, efficient, stable, and can be tested online.
(4) Hand-held aqueous ion meter
A new generation of portable hand-held aqueous ion meter, easy to carry, data display, economical and economical. The aqueous ion composite electrode can also be used with other ion meters.


Aqueous ion composite electrode is suitable for laboratory/medical inspection/chemical fertilizer/agricultural products/food/tap water and other occasions.

Instructions for use:

(1)Immerse the probe in the ion solution to be measured with a concentration of 1000PPM for at least 5 minutes or until the reading is stable. Configure at least two standard solutions, the concentration should be within the detection range of the probe, and the concentration interval between the two standard solutions is 10 times the order of magnitude to calculate the slope of the probe and check the measurement of the electrode.
(2)After the probe value in the first step is stable, take it out of the standard solution, rinse the electrode with deionized water, and blot it dry with laboratory test paper (do not let the probe soak in deionized water).
(3)First immerse the probe in a low-concentration standard solution, and stir the calibrated solution with a magnetic stirrer at a speed of about 100 revolutions/MIN. The voltage value can be recorded until the reading is stable (for a low-concentration solution less than 100PPM, you can soak Five minutes or more); Then immerse the probe in a higher concentration standard solution (5000 or 10000PPM), and repeat the above operation to record the voltage value.
(4)According to the formula V=KLOGC+D, where C is the concentration of the standard solution, V is the corresponding voltage value at that concentration, the slope of the linear relationship between the logarithm of the K concentration and the voltage value, and the calibration data of two or more measurements, and The slope K and D can be calculated for the concentration of the standard solution and the corresponding voltage value at this concentration, and a linear curve of the logarithm of the concentration and the voltage value can be obtained.

Technical Parameters:
Ion electrodeIonic membraneDetection range (ppm)PH rangeTemperature range (℃)
Ammonium ionPolyvinyl chloride0.03-90000-8.50-50
Barium ionPolyvinyl chloride0.5-137003-100-50
Cadmium ionPolyvinyl chloride0.02-400003-70-80
Calcium ionPolyvinyl chloride0.1-110003.5-110-50

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