Technical Articles
The Determination of Sulphate in Water
As there is no direct measuring Sulphate ISE the analysis is performed using a sample subtraction technique with a Lead ISE as the sensor.
Aluminium testing
There is no Ion Selective Electrode for Aluminium however due to the strong reaction with Fluoride in solution an indirect method is possible using a Fluoride ISE and some prepared reagents.
EDT Electrodes and Mettler Toledo Meters
Combination ISE’s and pH electrodes are compatible with all meters except for the multiparameter instruments.
Sulphide ISE Reagent Prep
Sodium Sulphide standard solutions can be prepared from reagent grade Sodium Sulphide Hydrate Na₂S.9H₂O. It is advised that all Sulphide solution preparation be performed in a fume hood to avoid breathing Noxious fumes.
EDT Electrodes and Hanna Meters
There are many pH and ION meters in laboratories all over the world. Many years ago some manufacturers had their own style of connector which prevented competitors from substituting their electrodes with their own.
Determination of Silver Concentration in Fixer Solutions
This is a method for the determination of silver ion concentration in hypochlorite based fixer solutions.
Cleaning My Fluoride ISE
This procedure will improve the electrode slope and enable the ISE to sense at low levels if this part of the range has been lost.
Electrode Storage
pH electrodes, unless they are half cells, should be stored in electrode storage solution.
Maintenance of my Chloride ISE
All crystalline ISEs do start to develop an oxidised layer on the crystal after a period of time.
Aluminium Measurement by ISE
Although there is no commercially available sensor for Aluminium, the concentration in solution can still be measured using a Fluoride ISE due to the reaction between Aluminium and Fluoride Ions forming a stable compound.