Determination of anionic surface active agents using silica coated magnetite nanoparticles modified with cationic surfactant aggregates.

Highlights: [•] A sample preparation method was proposed for anionic surfactants determination. [•] CTAB-coated nanomagnets allowed quantitative extraction of C10–C13 LAS homologues. [•] Excellent extractability was achieved with reduced amounts of CTAB and nanoparticles. [•] The proposed method was applicable to the analysis of natural aqueous matrices. [Copyright &y& Elsevier]