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Titanium dioxide (TiO 2 ) thin films were prepared by spin coating technique of sol precursor on Corning 7059 glass substrates. Spectral transmittances of as deposited and annealed samples were measured in the range of 250 to 1100 nm. Optical band gaps were calculated from the Tauc plots and was found to be about 3.78 eV for the annealed samples at 500• C. X-ray diffraction patterns were performed with as deposited and annealed samples. By annealing the samples at 500• C in various annealing times, the structure has changed from amorphous to the anatase crystalline state. Variations of the band gap energy values of TiO 2 films with cobalt doping were also investigated. Cobalt doping decreased the band gap value of TiO 2 films down to 3.25 eV. X-ray diffraction patterns were also given for the doped samples.

An efficient and fast dispersive magnetic solid phase extraction method was developed using MIL-101(Cr)/poly (mercaptobenzothiazole)@magnetite nanoparticles for the preconcentration and determination of nitrophenols in river and rain water samples.High-performance liquid chromatography-Ultraviolet instrument was applied for the analysis of target nitrophenols. The effect of several variables on the extraction performance was explored via design of experiment approach. Limits of detection and linear dynamic ranges were attained in the range of 0.05-0.10 µg/L and 0.2-250 µg/L, respectively. The enrichment factors were in the range of 317-363. The precision (n = 3) of dispersive magnetic solid phase extraction method was in the range of 5.3-6.8%. Eventually, the method was utilized for the analysis of target nitrophenols in river and rain water samples. K E Y W O R D Sextraction, magnetic nanoparticles, MIL-101(Cr), nitrophenols, preconcentration, poly (mercaptobenzothiazole) 3528 SUPPORTING INFORMATIONAdditional supporting information may be found online in the Supporting Information section at the end of the article.How to cite this article: Sohaniyan M, Manoochehri M, Daghighi Asli M. Liquid chromatographic determination of trace levels of nitrophenols in water samples after dispersive magnetic solid phase extraction.

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