1. Chemical Disinfectant Groups a. Aldehydes: (Formaldehyde, Paraformaldehyde, Glutaraldehyde) Formaldehyde – and its polymerized solid paraformaldehyde have broad-spectrum biocidal activity and are both effective for surface and space decontamination. As a liquid (5% concentration), formaldehyde is an effective liquid decontaminant.
Non-alcohol-based hand sanitizers may 1) not work equally well for all classes of germs (for example, Gram-positive vs. Gram-negative bacteria, Cryptosporidium, norovirus); 2) cause germs to develop resistance to the sanitizing agent; 3) merely reduce the growth of germs rather than kill them outright, or 4) be more likely to irritate skin than alcohol-based hand sanitizers 1,2.
Ammonia is an effective cleaning tool, and it’s more prevalent than you think. In fact, it’s commonly used in several cleaning products that might be in your home. Mixing ammonia and bleach can lead to a dangerous chemical reaction, so it’s important to learn which cleaners don’t mix. Here is a list of ammonia-based cleaners that might be lurking in your cabinets right now.
Although baking soda is often used a household cleaner, it is ineffective against most bacteria, including salmonella, E. coli. and staphylococcus. If you suspect there has been a contamination of any of these bacteria, ditch the baking soda in favor of a product registered as a disinfectant by the EPA.
Both bleach and iodophors should be made up in cold water in order to prevent breakdown of the disinfectant. c. Quaternary Ammonium Compounds: (Zephirin, CDQ, A-3) Quaternary ammonium compounds are generally odorless, colorless, nonirritating, and deodorizing. They also have some detergent action, and they are good disinfectants.
Acids/Alkalis: Strong mineral acids and alkalis have disinfectant properties proportional to the extent of their dissociation in solution. Some hydroxides are more effective than would be predicted from their values. In general acids are better disinfectants than alkalis. Mode of action is attributed to an increase of H
What is water disinfection? Water disinfection means the removal, deactivation or killing of pathogenic microorganisms. Microorganisms are destroyed or deactivated, resulting in termination of growth and reproduction. When microorganisms are not removed from drinking water, drinking water usage will cause people to fall ill.
So soap enables the water to remove dirt from your skin. It may remove bacteria from you, but it doesn't harm them. Disinfectant creates a chemical environment which is harmful to bacteria but, because you are so much larger, not to you. Disinfectant will not get dirt off your skin any better than water, but it will kill bacteria. In the absence of soap, bacteria can be protected by grease, so soap and disinfectant work together in an "I'll grab them, you hit them" way.
Dry heat is less effective than wet heat for sterilizing biohazardous materials. Dry heat requires more time (two to four hours) and a higher temperature (320–338°F or 160–170°C) to achieve sterilization. A Bacillus species biological indicator can verify dry heat sterilization.