Density measurement of cleaning agents and disinfectants

The composition of liquid cleaning agents and disinfectants can be monitored during production and in the final product by determining the density, given that the liquid under investigation is a binary mixture. If the liquid contains only very small amounts of additives, it can still be considered a binary mixture with sufficient accuracy. Some producers sell these cleaning agents and disinfectants by volume, others by weight. This makes the correct conversion of weight to volume an important step and will be explained in detail in this application report.

The role of cleaning and disinfecting agents

Consumer safety requires cleaning and disinfection in many fields of application that are subject to contamination, such as production equipment, floors, instruments, hands, and many more.

Liquid cleaning agents come in a variety of compositions, water-based and alcohol-based products among them.

Water-based products contain acids, bases, aldehydes, sodium hypochlorite (NaOCl), or per-compounds, for example hydrogen peroxide (H2O2). These products are often shipped in concentrated form and have to be diluted to concentrations of 1 % up to 10 % prior to use.

Alcohol-based products consist of alcohol/water mixtures in various concentrations, or mixtures of alcohols, mainly 1-propanol (or n-propyl alcohol or propan-1-ol), isopropyl alcohol (IPA; or propane-2-ol or 2-propanol), and ethanol. Some of these products also contain an active ingredient like a quaternary ammonium compound in concentrations below 1 %.

For the quality control and during production of these solutions, the determination of density as a sum parameter is most suitable.

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