Sodium in food and beverages by Ion Selective Electrode (CAT#: STEM-ACT-0103-WXH)

Introduction

Sodium is an essential nutrient and is needed by the body in relatively small amounts(provided that substantial sweating does not occur) to maintain a balance of body fluids and keep muscles and nerves running smoothly.<br />Sodium is found naturally in foods, but a lot of it is added during processing and preparation. Many foods that do not taste salty may still be high in sodium. Large amounts of sodium can be hidden in canned, processed and convenience foods.

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Principle Applications Procedure Materials Notes Related Products

Principle

An ideal 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.

Applications

• Used for the potentiometric determination of several anions (fluoride, chloride, bromide, iodide ion) and cations (sodium, potassium, calcium ion).
• Used for endpoint detection in potentiometric titration.
• In biochemistry, ion selective electrodes are used for the determination of enzymes and substances which interact with enzymes.

Procedure

1. Preparation of Standards
2. Instrument Setup and Operation
3. Analysis of sample

Materials

Ion Selective Electrode

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