Water quality - Determination of anionic surfactants by measurement of the methylene blue index MBAS

This technical specification establishes a standardized methodology for the determination of anionic surfactants in water samples using the methylene blue active substances (MBAS) test. The procedure provides detailed instructions for sample preparation, reagent selection, and the spectrophotometric analysis required to quantify these compounds accurately. By following the outlined steps, laboratories can ensure consistent and reproducible results when assessing water quality. The method covers specific conditions for color development and measurement wavelengths, ensuring that variations in water composition do not compromise the integrity of the analysis. This approach facilitates the monitoring of water bodies and wastewater treatment processes, supporting environmental protection efforts through reliable data generation. The text focuses on the operational aspects of the test, including safety considerations and calculation methods for final results, without offering subjective commentary on its efficacy or necessity.