Which Portable Reference Electrode is most suitable for measurements in seawater?

The most suitable Portable Reference Electrode for measurements in seawater is the Saturated Calomel Electrode (SCE). This type of electrode is known for its stable reference potential, which is crucial in conducting accurate and reliable measurements in various environments, including seawater. The SCE utilizes mercury and mercury(I) chloride in a saturated potassium chloride solution, which provides a consistent electrochemical environment necessary for effective measurements.

In the case of seawater, which has a complex ionic composition and can vary significantly in salinity and temperature, the stability of the SCE makes it a preferred choice. Its ability to withstand the corrosive nature of seawater while maintaining a reliable potential allows for more accurate corrosion assessments and cathodic protection measurements.

Choosing a different type of electrode may lead to inaccuracies due to changes in potential caused by varying ionic strengths or contamination. Therefore, the SCE's proven reliability and stability in marine environments establish it as the go-to option for measurements in seawater.