Removal and measurement of bromocresol purple dye in aqueous samples by β-cyclodextrin-modified magnetic carbon nanotube with dispersive solid-phase extraction technique

This study investigated the pre-concentration, determination and removal of small amounts of colored effluents from bromocresol purple dye in various aqueous samples. In this research, a new method of solid phase extraction in aqueous samples has been performed by magnetic carbon nanotubes modified with β-cyclodextrin. The proposed method is cheap, easy and fast and is compatible with many existing device methods. Parameters of extraction of bromocresol purple from an aqueous sample including the effect of organic and desorbent solvent, optimum pH (pH = 9), extraction time, stirring speed, volume of phase giver were studied. The mentioned technique has many advantages such as; It has a short extraction time, low consumption of organic solvents, elimination of the effect of previous tests, low detection limit and high concentration factor. Concentration factor of 14.3 and detection limit for bromocresol purple dye was 4.8 μg / L, respectively. The linear range of method between 0.1-20 mg / L and the relative standard deviation for bromocresol purple was 4.65%.