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.
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 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.
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.
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.
