Standard Test Method for Methylene Blue Active Substances

Importancia y uso:

5.1 The widespread use and discharge of detergents into surface waters can result in a lowering of its aesthetic quality by foam formation and by causing toxicity to aquatic wildlife. This test method is capable of detecting small concentrations of detergents as MBAS so that they can be controlled to prevent such problems.

5.2 Biodegradable linear alkyl benzene sulfonates (LAS) have replaced the branched-chain alkyl benzene sulfonates (ABS) in detergent formulations, which were more resistant to biodegradation. Differentiation between linear and branched-chain alkyl benzene sulfonates, as well as differentiation of the various positional isomers of either type, is not possible by this test method. While the methylene blue method may be employed to monitor studies designed to measure biodegradability, it cannot be used to predict this quality.

Subcomité:

D19.06

Referida por:

D0459-16, D3694-96R24, D8006-24, D8006-24

Volúmen:

11.02

Número ICS:

13.060.50 (Examination of water for chemical substances)

Palabras clave:

chloroform; extraction; hydrophobic ions; linear alkyl benzene sulfonate; methylene blue; spectrophotometer;