The wide use of surfactants (Personal Care Product; pharmaceuticals; detergents...) makes their presences in the environment rather ubiquitous. Among the large group of surfactants quaternary ammonium compounds (QACs) have been shown to have a strong toxicity to aquatic organisms (Zhang et.al. 2015 ]). Particulate QACs fraction from waste water treatment plant (WWTP) effluent may accumulate in sediment, the dissolved fraction, could accumulate in algae. In this respect, Cladophora with their negatively charged surface could adsorb QACs, previous work have confirmed the accumulation of cationic metals in Cladophora (Bakatula et.al. 2014) . As well, the hydrophobic moieties of QACs support adsorption on Cladophora. In this study, the presence of a selection of cationic surfactants as well as zwitterionic were investigated in sediments and Cladophora from freshwater.

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