Hello, I am struggling with a question on how to come up with the most suitable disinfectant, soap, or detergent for cleaning my plastic 30 L tanks, used to collect tap drinking water samples.
Currently I am using Chlorine containing tablets that turned out to be not very efficient because the solvent cannot be removed completely even after several washings, killing afterwards all bacteria in the sample, giving a poor DNA concentration results.
The is one option that same to our mind: it is hydrogen peroxide, but it would be nice to have some more options.
Could you please suggest some easily removable but efficient soaps, disinfectants or detergents with short contact time.
To have an overview, I am doing the following:
1) Colecting Demi water to the tank, adding the tablet
2) Waiting for about 10 minutes until it is completely dissolved
3) Mixing and shaking the canisters
4) Pouring water with the detergent
5) Washing the canisters for about 3-4 times with fresh demi water until the chlorine odour is gone
Maybe peroxyacetic acid. Quite efficient. Currently used in food industry or for cleaning medical devices. It seens that it can be eliminated easily after use. A little bit touchy for your eyes or lung if you do not use it the way you should:
Article Simultaneous Sampling of Peroxyacetic Acid and Hydrogen Pero...
orArticle Sensory Irritation of Acetic Acid, Hydrogen Peroxide, Peroxy...
I suggest that you remove the residual chlorine after disinfection by adding a reducing agent such as sulfite or thiosulfate. This should ensure that you have both a good and fast disinfection and eliminate the effect of residual chlorine.
Soap is usually used for cleaning not for disinfecting. Cleaning and disinfecting are two different issues.
Cleaning does not kill germs, but by removing them, it lowers their numbers and the risk of spreading infection. If a surface may have gotten the virus on it from a person with or suspected to have COVID-19, the surface should be cleaned and disinfected. Disinfecting kills germs on surfaces.
Source: CDC
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