GOST 32387 Household Chemical Products - Method for Determination of Active Oxygen Mass Fraction

One of a series of technical standards developed by the Eurasian Council for Standardization, Metrology and Certification (EASC) The standard "GOST 32387 Household Chemical Products - Method for Determination of the Mass Fraction of Active Oxygen" describes a titrimetric method for measuring the mass fraction of active oxygen in household chemical products, such as liquid (including thickened) and powder cleaners containing peroxide compounds. This method is applicable to household chemical products containing active oxygen compounds in the concentration range of 0,3 to 14,0 percent. However, it is not applicable to products containing other oxidizing agents in addition to peroxide compounds.

This method is based on the reaction of peroxide compounds with potassium permanganate in sulfuric acid. The amount of active oxygen is determined by titration.

This standard replaces the standard “GOST R 50672 Household chemical products - Method for determination of mass fraction of active oxygen”.

The equipment used in these tests includes: analytical balance, volumetric flasks and pipettes, burette, conical flasks, and water bath (if temperature control is required). The reagents used are: potassium permanganate solution, sulfuric acid (diluted to the required concentration), and distilled or deionized water.

For the tests, the appropriate amount of test sample (liquid or powder) is accurately weighed. The sample is dissolved in distilled water and transferred to a conical flask. A measured volume of dilute sulfuric acid is added to the flask to create the acidic environment required for the reaction. The solution is then titrated with standardized potassium permanganate solution. The titration is continued until a persistent pink color remains, indicating the end point. The mass fraction of active oxygen is calculated using the volume of potassium permanganate solution consumed, its concentration, and the mass of the sample. All glassware must be clean and free of contaminants that could affect the reaction. A blank determination should be made to account for any impurities in the reagents. Because temperature can affect reaction rates, the test, if specified, is conducted at a controlled temperature. Detailed instructions, including specific concentrations, volumes, and calculation formulas, should be followed in the standard.

Active oxygen mass fraction refers to the percentage by mass of active oxygen present in a chemical product, particularly in substances that release oxygen during a chemical reaction, most commonly peroxide compounds such as hydrogen peroxide, sodium percarbonate, or sodium perborate. Active oxygen is the reactive portion of oxygen-releasing compounds and is used in:

• Bleaching agents (e.g. in detergents and washing powders)
• disinfectants
• Cleaners
• Oxidizing agents in chemical processes

Measuring the mass fraction of active oxygen helps determine product activity and stability. It is usually expressed as a percentage. Active oxygen refers to the oxygen available for oxidation reactions, not to any oxygen atoms in the compound. Measurement is typically made by redox titration using potassium permanganate as a titrant, as specified in standards such as GOST 32387. The mass fraction of active oxygen is a quality control parameter for ensuring consistent product strength in industrial and household chemical formulations.

Active oxygen mass fraction is important because it directly measures the oxidizing power of a chemical product. The primary reasons for this ratio are:

• Indicates chemical activity: Active oxygen is what performs oxidation or disinfection in products like detergents, bleaches, and sterilizers. A higher mass fraction generally means a stronger or more effective product.
• Quality control and consistency: Manufacturers use active oxygen mass fraction to ensure batch-to-batch consistency. It helps verify that a product meets its label claim (for example, "contains 5 percent active oxygen").
• Regulatory compliance: GOST 32387 and similar ISO or ASTM standards require testing for active oxygen content. Government agencies may set limits or minimum thresholds for product registration and market approval.
• Safety assurance: Peroxides and other oxygen-releasing compounds can be hazardous if too concentrated. Monitoring active oxygen content helps ensure products are safe for handling and storage.
• Environmental impact: Activated oxygen compounds are generally more environmentally friendly alternatives to chlorine-based oxidizers. Knowing the exact amount of active oxygen supports green or chlorine-free claims.
• Shelf life monitoring: Over time, peroxide-based products can deteriorate and lose their effectiveness. Measuring active oxygen helps determine if a product has expired or is losing its effectiveness.

In short, active oxygen mass fraction is a direct measure of a product's potency, safety, and compliance. Whether you're a manufacturer, regulatory authority, or consumer, this measurement ensures the product safely performs what it claims.

Our organization, which has been supporting businesses across all sectors for years through a wide range of testing, measurement, analysis, and evaluation activities, has a strong team of employees who closely follow global developments in science and technology and are constantly improving themselves. In this context, we also provide testing services in accordance with the GOST 32387 Household Chemical Products - Method for Determination of Active Oxygen Mass Fraction.