|Range||MDL||Method||Kit Catalog No.||Refill Catalog No.|
|0-3 ppm||0.125 ppm||Methylene Blue||K-9400||R-9400|
|Range||Method||Kit Catalog No.|
|0-2.50 ppm||Methylene Blue||I-2017|
Detergents can be introduced into the water supply by industry, soap manufacturers, and private households. Environmental analysts often include a determination of anionic detergents when assessing surface water pollution.
The Methylene Blue Method
References: USEPA Methods for Chemical Analysis of Water and Wastes, Method 425.1 (1983). APHA Standard Methods, 21sted., Method 5540 C (2005). ASTM D 2330-02 , Methylene Blue Active Substances.
The methylene blue active substances (MBAS) method is used in a 3-minute procedure to measure anionic detergents in the 0-3 ppm (mg/L) range. The procedure features a unique extraction/sampling technique that eliminates several steps required in other test procedures and provides increased sensitivity.
Anionic detergents react with methylene blue to form a blue-colored complex that is extracted into an immiscible organic solvent. Results are expressed in ppm (mg/L) as linear alkylbenzene sulfonate (LAS), equivalent weight 325.
Shelf-life: The shelf-life of R-9400 is 5 months and of R-9404 and R-9423 is 8 months. We recommend stocking quantities accordingly.