Mention disadvantages of ion selective electrode.
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Answer:
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.
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