Podcast
Questions and Answers
What is the risk of not keeping pH electrodes moist?
What is the risk of not keeping pH electrodes moist?
Why should the pH electrode never be cleaned mechanically by wiping it?
Why should the pH electrode never be cleaned mechanically by wiping it?
What effect does using distilled water for storage have on the pH electrode?
What effect does using distilled water for storage have on the pH electrode?
Why is regular cleaning of the pH electrode important?
Why is regular cleaning of the pH electrode important?
Signup and view all the answers
What is a key reason for performing regular calibration of the pH meter?
What is a key reason for performing regular calibration of the pH meter?
Signup and view all the answers
Study Notes
PH Meter Cleaning Procedure
- Proper cleaning of the pH electrode begins with storage, which can increase the service life.
- Combination and reference electrodes with electrolyte liquid should be stored in the same aqueous solution.
- Gel electrodes should be stored in 3 mol/l KCl solution, while glass electrodes require storage in deionized water.
Storage Duration
- Short-term storage: Tap water or storage solution for a few hours or days.
- Medium-term storage: Storage solution for several days.
- Long-term storage: Dry storage for several weeks or months, followed by soaking in storage solution for several hours and calibration.
Cleaning Solutions
- Standard solutions: Alkaline surfactant and polyphosphate solution, sodium hypochlorite solution, and phosphoric acid for general application and common contaminants.
- Specific solutions:
- Ethanol, acetone, or alkaline surfactant and polyphosphate solution for greases and oils, meat fat, and ink stains.
- Pepsin/HCl solution for proteins.
- HCl or caustic soda solution for inorganic substances.
- Sodium hypochlorite solution for blood products, beer and wort residues, milk sediment, and dairy products.
- Thiourea solution for blood products and beer and wort residues.
5-Step Cleaning Process
- Step 1: Rinse with distilled water after measurement to remove superficial residues.
- Step 2: Immerse in a suitable cleaning solution until the visible diaphragm appears clean.
- Step 3: Replace internal electrolyte fluid if possible.
- Step 4: Soak in storage solution for two to three hours.
- Step 5: Perform a new calibration at regular intervals or after a longer storage period.
Important Notes
- Avoid mechanical procedures (rags, brushes) to prevent damage to the sensitive surface.
- Extend immersion and watering intervals if soils remain visible after cleaning.
- Types of buildup and contamination depend on frequency of use, type of electrode, and test sample.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Learn about the proper procedure for cleaning and caring for a pH electrode to ensure accurate measured values. Find out about storage, types of contamination, and steps for ideal maintenance. Understand the importance of proper storage and cleaning for pH electrodes.