1Key Takeaways
This standard specifies the methylene blue spectrophotometric method for the determination of anionic surfactants in aqueous solutions. This method is suitable for the determination of low concentration methylene blue active substances (MBAS), that is, anionic surface active substances, in drinking water, surface water…
2Scope / Description
This standard specifies the methylene blue spectrophotometric method for the determination of anionic surfactants in aqueous solutions. This method is suitable for the determination of low concentration methylene blue active substances (MBAS), that is, anionic surface active substances, in drinking water, surface water, domestic sewage and industrial wastewater. Under the experimental conditions, the main analytes are LAS, sodium alkylsulfonates and sodium fatty alcohol sulfates, but some positive and negative interferences may be present (see Chapter 8). When a cuvette with a 10mm optical path is used and the sample volume is 100m1, the minimum detection concentration of this method is 0.05mg/LLAS, and the detection limit is 2.0mg/LLAS.
5Citation Network
Standards that cite GB/T 7494-1987
6Frequently Asked Questions
What is GB/T 7494-1987?
GB/T 7494-1987 — Water quality--Determination of anionic surfactants--Methylene blue spectrophotometric method is an international standard developed by General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China. This standard specifies the methylene blue spectrophotometric method for the determination of anionic surfactants in aqueous solutions. This method is suitable for the determination of low concentration methylene blue active substances (MBAS), that...
What does GB/T 7494-1987 cover?
This standard covers: This standard specifies the methylene blue spectrophotometric method for the determination of anionic surfactants in aqueous solutions. This method is suitable for the determination of low concentration methylene blue active substances (MBAS), that is, anionic surface active substances, in drinking...
Who should use this standard?
This standard is intended for organizations, professionals, and stakeholders involved in quality management and organizational excellence. It is applicable to manufacturers, service providers, regulatory bodies, and certification organizations.
What is the latest version of GB/T 7494-1987?
The current published version is GB/T 7494-1987, published on 1987-03-06. Always check for amendments or pending revisions.
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