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)— 13 стр.
Water quality; determination of anionic surfactants by measurement of the methylene blue index MBAS (ISO 7875-1:1984, modified); German version EN 903:1993— 14 стр.
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)— 12 стр.
Optical cells for photometric measurements of liquids in the ultraviolet, visible and near infrared spectral region; requirements concerning rectangular and cylindrical spectrophotometric cells— 3 стр.
Water quality - Determination of the elimination and biodegradability of organic compounds in an aqueous medium - Activated sludge simulation test (ISO 11733:2004); German version EN ISO 11733:2004— 43 стр.
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)— 12 стр.
German standard methods for the examination of water, waste water and sludge; bio-assays (group L); surfactant biodegradation and elimination test for simulation of municipal waste water treatment plants (L 26)— 16 стр.
Water quality; determination of anionic surfactants by measurement of the methylene blue index MBAS (ISO 7875-1:1984, modified); German version EN 903:1993— 14 стр.
