16 ANALYTICAL AND LABORATORY EQUIPMENT
CLEANING PROCESSES C
Considerations for
Judy Shapiro presents some procedural guidelines for proper usage of critical cleaners
leaning tasks require individualised procedures; each cleaning application is unique. Cleaning processes should be developed carefully and methodically for each application to achieve the most beneficial and cost effective results. Consider a variety of factors to determine the proper technique for each distinct cleaning application.
Choose a detergent that best matches the soil Determine the soil being removed. It is important to match the right cleaner to the soil. In most instances, substances such as oil and grease can be cleaned with an alkaline cleaner, while foulants such as rust, mineral deposits and hard water scale may require the use of a citric acid cleaner; proteins and starches may need an enzymatic cleaner. Choosing proper detergents leads to more effective, economical processes in the long run.
Consider the surface being cleaned Just as it is important to match the cleaner to the soil, it is equally as imperative to consider the cleaning surface. Choose a detergent that is compatible with the substance you are cleaning. Soft metals (copper, zinc, aluminium) and delicate electronic components often require cleaners with a neutral pH; choosing an acid or alkaline cleaner for these substances could result in surface damage. Most filter membranes require cleaning chemicals with a typical pH below 10. It is always advisable to test for compatibility
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prior to introducing a new cleaner into your processes. Research enables you to choose the proper cleaner.
Determine the proper cleaning method Cleaning methods vary from application to application. Small or moderate sized parts and equipment often lend themselves to a manual or immersion washing system, while large pieces of equipment or complete systems require a clean in place (CIP) wash method.
Choice of cleaning method
is further defined by soil type and level of cleanliness needed. Critical cleaning applications that need to be validated often require ultrasonic cleaning methods or automatic washing systems, while a thorough hand washing might suffice for other needs. Ultrasonics, automatic washers
or agitation may improve the cleaning action. Common cleaning methods include CIP, ultrasonic, manual, immersion, automatic systems (either mild or high agitation), and pressure washing systems. After determining the proper method for your specific cleaning application, choose the detergent that is best suited for that method. Tis is in addition to the above considerations of soil and substrate.
Use the right amount of detergent Using the proper concentration of detergent is a key factor in determining your optimum cleaning process. Tis is not a case of the classic ‘more is better’ adage; using too much detergent can be as disruptive to your outcome as using too little. Te recommended concentration of detergent in your solution may
IPCOL offers an array of products for many different laboratory cleaning applications
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