How does nitrate ion selective electrode work?

How does nitrate ion selective electrode work?

The Vernier Nitrate Ion-Selective Electrode (ISE) is a membrane-based electrode that measures a specific ion (NO3–) in an aqueous solution. When the membrane of the electrode is in contact with a solution containing the specific ion, a voltage, dependent on the level of that ion in solution, develops at the membrane.

What does an ion selective electrode measure?

Ion selective electrode (ISE) is an analytical technique used to determine the activity of ions in aqueous solution by measuring the electrical potential. ISE has many advantages compared to other techniques, including: It is relatively inexpensive and easy to operate. It has wide concentration measurement range.

What is pH meter?

A pH meter is an instrument used to measure hydrogen ion activity in solutions – in other words, this instrument measures acidity/alkalinity of a solution. The degree of hydrogen ion activity is ultimately expressed as pH level, which generally ranges from 1 to 14.

How do nitrates help plants grow?

Plants use nitrates as a supply of nitrogen, which is needed to make proteins for healthy growth. Plants absorb nitrates in water through their roots. Nitrates are present in high levels in plant fertilisers. Without nitrates, the amount of chlorophyll in leaves reduces.

What are ion selective electrodes explain with the help of an example?

Glass membranes Chalcogenide glass also has selectivity for double-charged metal ions, such as Pb2+, and Cd2+. The glass membrane has excellent chemical durability and can work in very aggressive media. A very common example of this type of electrode is the pH glass electrode.

What is ISE testing?

The ISE Exam is a free placement exam given to assess the English proficiency of international students at USC. After taking the ISE Exam, students are either released from any ALI requirement or receive an ALI placement.

How is nitrate concentration measured?

Colormetric. Colorimetric determination of nitrate involves the use of cadmium to reduce nitrate to nitrite. Nitrite is then reacted with another reagent to form a reddish dye. The intensity of the color produced is proportional to the nitrate concentration in the sample.

Why is the nitrate test important?

Major sources of nitrate contamination can be from fertilizers, animal waste, and human sewage. It is highly recommended to test your drinking water supply on a regular basis. Elevated levels of nitrate in drinking water can cause Blue Baby Syndrome in infants under six months of age and that are bottle fed.

Why KCl is used in pH meter?

Potassium chloride (KCl) acts as a source of chloride ions for the electrode. The advantage of using KCl for this purpose is that it is pH-neutral. Typically, KCl solutions of concentrations ranging from 3 molar to saturated are used in pH meters.

How nitrate ions enter the roots of plants?

Plants take up nitrate from the soil via the transporter proteins present in the root cell membrane. There are other nitrate transporters that are involved in moving nitrate within plants to different tissues as needed.

Why is nitrate important in soil?

Abstract. Under temperate climates and in cultivated soils, nitrate is the most important source of nitrogen (N) available for crops and, before its reduction and assimilation into amino acids, must enter the root cells and then move in the whole plant.

What are the characteristics of Ion selective electrodes?

Explanation: Ion selective electrodes have wide concentration range. It is highly selective to a particular ion. 8. Ion selective electrode are unaffected by colour or turbidity of the solution.

What are ion-selective electrode how they are classified?

Ion-selective electrodes can either be classified according to the membrane material used or the type of electrode body arrangement. Both classifications show that neutral carrier-based liquid membrane microelectrodes represent a very special type of electrode out of a vast variety of sensors.

What is the most common type of ion-selective electrode?

pH electrode
The most common glass membrane ion selective electrode is the pH electrode. Another common one is the sodium selective electrode. Crystalline or solid state membrane electrodes are made from relatively insoluble ionically conducting inorganic salts. These are available in homogeneous and heterogeneous forms.

What are the characteristics of ion-selective electrodes?