Reaffirmed 2023

1. SCOPE

1.1 This standard (Part 68) prescribes a spectrometric ethod of test for the determination of anioninc surfactants by measurement of the methylene blue index (MBAS) in aqueous media.

1.2 This method is applicable to a range of concentrations from 0.1 mg/l to 5.0 mg/l and the limit of detection is about 0.05 mg/l for solutions of standard surfactants in distilled water.

2. REFERENCES

The standards listed below contain provisions which through reference in this text, constitute provisions of this standard. At the time of publications, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:

1070 : 1992 Reagent grade water

3025 (Part 1) : 1987 Methods of sampling and test (physical and chemical) for water and wastewater: Part 1 Sampling