DIN EN 903:1994
Water quality; determination of anionic surfactants by measurement of the methylene blue index MBAS (ISO 7875-1:1984, modified); German version EN 903:1993

Standard No.

DIN EN 903:1994

Release Date

1994

Published By

German Institute for Standardization

Latest

DIN EN 903:1994

Scope

The document describes a method for photometric determination of low concentrations of methylene blue active substances (MBAS), i.e. anonic surface active material (chiefly sulfonates and sulfates) in influents and effluents of sewage plants, waste, surface and drinking water. The range of this method is 0.1 to 5.0 mg/l, the limit of detection for solutions of standard surfactants in distilled water, about 0.05 mg/l.#,,#

DIN EN 903:1994 history

• 2010 DIN 38409-23:2010 German standard methods for the examination of water, waste water and sludge - Parameters characterizing effects and substances (group H) - Part 23: Determination of bismut active substances (H 23)
• 1980 DIN 38409-23:1980 German standard methods for the examination of water, waste water and sludge; general measures of effects and substances (group H), determination of methylen blue active and bismut active substances (H23)