Question

Advantage and disadvantage of ion selective electrode

Answer 1

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Electro analytical methods have a long history of development. Ion-selective

potentiometry is one of the electro analytical methods. Th ere are some advantages

of the use of Ion selective potentiometry (ISP) which is accurate, fast, economic

and sensitive in relation to the standard method, UV/VIS spectroscopy. Th e

development of potentiometric ion-selective electrodes is a very interesting fi eld

because it has a wide range of applications in determining ions in water and other

mediums. Th e use of ion-selective electrodes enables the determination of ion

species in a trace. Ion-selective electrodes are suitable for analysis in industry,

for control processes, for physiological measurements and environmental

monitoring. In recent years it was used for the determination of many ions in

the food industry such as determination of calcium in milk products, fruit juice

and diff erent kinds of vegetables. In our experiment measurement of bottled

water using ISP showed lower level of fl uoride compared to measurement by UV/

VIS spectroscopy. Th is results confi rmed higher sensitivity of ISE in reference

to UV/VIS spectroscopy. By our experimental data we can conclude that the

concentration in examined sample was within the allowed concentration

according to World Health Organisation.

Answer 2

Answer:

An ion-selective electrode is a transducer (or electrochemical sensor) that converts the activity of a specific ion dissolved in a solution into an electrical potential. It is based on the principle of a galvanic cell.

Explanation:

Some advantages of the ion-selective electrode:

• Less expensive than competing techniques
• Large dynamic range (can measure a wide range of concentrations)
• The sample is not consumed
• Doesn't contaminate the sample
• Short response time ( usually less than 1 minute )

Some disadvantages of the ion-selective electrode:

• Precision is low (often worse than 1%)
• Organic solutes can "foul" electrodes
• Other icons may interface with the analyte you're trying to measure
• Some electrodes are fragile
• Only measures the activity of free ions (not complexed with any ligands)

#SPJ2