Aria Tsam thanks for your reply
unfortunately, I couldn't find files you introduced in below links:
1-www.genium.com/pdf/wwl.l15.pdf
2-www.mdpi.com/1422-0067/12/1/633/pdf
Hello Mahdi,
Methylene blue active substances (MBAS) bring about the transfer of methylene blue, a cationic dye, from an aqueous solution into an immiscible organic liquid upon equilibration. This occurs through ion pair formation by the MBAS anion and the methylene blue cation. The intensity of the resulting blue color in the organic phase is a measure of MBAS.
And anionic surfactants are among the most prominent of many substances, natural and synthetic, showing methylene blue activity. The MBAS method is useful for estimating the anionic surfactant content of waters and wastewaters, but the possible presence of other types of MBAS always must be kept in mind.
I suggest you for read the APHA method- 5540 for surfactants.
Dear Harpreet
Hello
Thank you for your attention. This method is useful for anionic and nonionic surfacatant but I need a method for total surfactants together (cationic, anionic and nonionic).
I prefer an instrumental method such as HPLC or GC.
Well dependent on what surfactants you are working with you can use a HPLC with a C18 column and a detector such as an MS. This allows you to detect most surfactants, also at low concentrations. However, you can also use other detectors like FLU for some surfactants, or ELSD.
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