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Hydrogen peroxide (H2O2) is a compound with strong oxidizing ability, which can fight against a variety of microorganisms, including bacteria, viruses, fungi, yeasts and spores1,2. It has been used in various formulations of bleach, disinfectant and disinfectant.
The concentration of H2O2 varies according to the purpose of the formulation1. Although H2O2 at a concentration of 3% is an effective disinfectant, H2O2 at a maximum concentration of 0.5% is considered effective against surface viruses2.
The formula contains a low concentration of H2O2 to help stop bacterial spores that contaminate the solution3. For this application, the H2O2 content is determined by redox titration, using cerium(IV) sulfate as the titrant and DMi140-SC electrode.
1. Titrant: Cerium sulfate, Ce(SO4)2, 0.1 mol/L
H2O2 + 2Ce(SO4)2 → Ce2(SO4)3 + H2SO4 + O2
1. Determination of cerium sulfate titer c(Ce(SO4)2) = 0.1 mol/L Obtained titer value = 1.00505 s = 0.00172 srel = 0.171% n = 6
(a) Standard 1.5% H2O2 solution:
Table 1. Source: METTLER TOLEDO-Titration
Table 2. Source: METTLER TOLEDO-Titration
The H2O2 content in the disinfectant and disinfectant samples is determined, and the value obtained by cerium sulfate redox titration is exactly the same as the expected H2O2 content in the two samples. In terms of comparable standard deviations (ie srel), the repeatability of standards and samples is excellent.
The cerium is precipitated with sodium hydroxide, filtered, and treated as special waste.
http://www.mt.com/ch/en/home/products/Laborat ory_Analytics_Browse/Product_Family_Browse_titr ators_main/Titration_Excellence.html?cmp=als_Tit ration-Excellence
Table 3. Source: METTLER TOLEDO-Titration
Table 4. Source: METTLER TOLEDO-Titration
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Last update: January 21, 2021 at 6:02 am
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