Citation: NIE Dong-Xia, SHI Guo-Yue, YU Yan-Yan. Fe3O4 Magnetic Nanoparticles as Peroxidase Mimetics Used in Colorimetric Determination of 2,4-Dinitrotoluene[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(2): 179-185. doi: 10.11895/j.issn.0253-3820.150319
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Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) were prepared by co-precipitation method, which possessed intrinsic peroxidase-like activity. It was found that the as-prepared Fe3O4 MNPs could not only catalyze the oxidation of peroxidase substrate, diammonium 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) by H2O2 to produce the colored product with maximum absorbance at 417 nm, but also catalyze the oxidation of 2,4-dinitrotoluene (DNT) by H2O2 and thus consume H2O2 in the reaction system. On the basis of the reaction described above, a novel colorimetric reaction system based on Fe3O4 MNPs-ABTS-H2O2-DNT was established for determination of trace amount of DNT. Some key influencing factors of the proposed Fe3O4 MNPs-ABTS-H2O2-DNT system were systematically discussed and optimized. Under the optimal conditions, the absorbance of the system at 417 nm displayed a good linear response with DNT concentration in the range from 5×10-7 to 2.0×10-5 mol/L with a detection limit of 1.5×10-7 mol/L (S/N=3). These results demonstrated that the constructed colorimetric method was simple, rapid and sensitive enough for colorimetric detection of DNT, which would have a great potential in the application of on-line monitoring of DNT in environmental water samples.
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