Determination of aniline derivatives in water samples after preconcentration with oxidized multiwalled carbon nanotubes as solid-phase extraction disk

Abstract

A sensitive and selective preconcentration method using solid-phase extraction (SPE) disk made from oxidized multiwalled carbon nanotubes (OMWCNTs), has been developed for the determination of aniline derivatives, such as 2-nitroaniline (2-NA), 4-nitroaniline (4-NA), and 2,4-dichloroaniline (2,4-DCA) in water samples. Anilines were extracted onto OMWCNT disk and then determined by high performance liquid chromatography (HPLC) with UV detector. Several parameters on the recovery of the analytes were investigated. The experimental results showed that it was possible to obtain quantitative analysis when the solution pH was 8 using 200 mL of validation solution containing 2 µg of anilines and 10 mL of acetonitrile/ethanol (8/2, v/v) as an eluent. Relative standard deviations for five determinations were 7.5% (2-NA), 6.5% (4-NA) and 3.8% (2,4-DCA) under optimum conditions. The linear range of calibration curves were 0.5 ng·mL^-1 to 15 ng·mL^-1 for each analyte with good correlation coefficients. The detection limits (3S/N) of 2-NA, 4-NA and 2,4-DCA were 30 pg·mL^-1, 31 pg·mL^-1 and 26 pg·mL^-1, respectively. Our method was successfully applied to the determination of aniline compounds in river water sample with high precision and accuracy.

Keywords

aniline determination / solid-phase extraction / oxidized multiwalled carbon nanotubes / water sample / HPLC-UV

References

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Acknowledgments

We gratefully acknowledge the financial support of this study by Grant-in-Aid for Young Scientists (B) No. 22710076 from the Ministry of Education, Culture, Sports Science and Technology of Japan.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg