What is the purpose of NaCl in TISAB?
What is the purpose of NaCl in TISAB?
TISAB, in general, is mixed with samples, as it helps in maintaining the ionic strength and pH constant. It is mainly used to decomplex metal-F complexes. TISAB I can be prepared using NaCl with glacial acetic acid, tri-sodium citrate and NaOH.
What is the principle of ion selective electrode?
Principle of ion-selective electrode (I.S.E.) consists of a thin membrane across which only the intended ion can be transported. The transport of ions from a high conc. to a low one through a selective binding with some sites within the membrane creates a potential difference.
How does an ion-selective electrode work?
The ion-selective electrode works based on the principle of a galvanic cell. The difference in potential between the electrode and the membrane depends on the activity of the specific ion in solution. The strength of the net charge measured is directly proportional to the concentration of the selected ion.
How does a fluoride electrode work?
This cell acts as a concentration cell with transference where the fluoride transport number is 1. As transference of charge through the crystal is almost exclusively due to fluoride, the electrode is highly specific to fluoride. The only ion which significantly interferes is hydroxide (OH−).
How do you make an ion-selective electrode?
Figure 2. Ion-exchange process. In order to construct an ion-selective electrode, we would add an inner reference solution to the other side of the membrane. This solution would contain a fixed concentration of the ion of interest, Li+ in this example.
Can ion-selective electrodes be used for pH measurements explain?
The most well-known and highly used ion-selective electrode is a pH electrode, which is sensitive toward the H+ ion. A desirable aspect of ion selective electrodes is their ease of use. Using pH electrodes as an example, after appropriate calibration, it is quite trivial to measure the pH of a solution.
