Risk of contamination is greatly reduced for a ceramic capillary fused in glass, there is no sharp-edged contact with the sample, and the electrode is less sensitive to air bubbles
The use of glass capillaries as the diaphragm for pH measurement in strongly contaminated samples has proven itself for years in the Porotrode, says Metrohm.
Typical applications are pH measurement in diary products or solutions with high sulphide content.
The new Porotrode is equipped with two ceramic capillaries and is said to have many advantages.
Plastic free electrode: the new Porotrode is resistant to aggressive organic solvents (such as ketones, aldehydes, ethers, CFCs, etc).
The risk of contaminating and blocking the diaphragm is greatly reduced for a ceramic capillary fused in glass.
There is no sharp-edged contact with the sample matrix and the electrode is less sensitive to air bubbles.
The use of two capillaries reduces the risk of the electrode failing to function.
It will continue to work even if one of the capillaries is blocked completely.
The position of the capillary diaphragm as well as its shape reduces the dependency of the measured pH value on the stirring speed.
This means that the new Porotrode can also be used for titrations in strongly contaminated solutions.
