Voltammetric determination of 2,4-dinitrophenol and 2,5-dinitrophenol using a poly-aspartic acid modified electrode1 |
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Authors: | Xiao-Gang Wang Ya-Juan Fan Zhi-Xian Hao Li-Hua Gan |
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Institution: | 1.Department of Chemistry,Tongji University,Shanghai,PR China;2.Department of Maths,Tongji University,Shanghai,PR China |
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Abstract: | In pH 5.0, 0.1 mol l−1 NaAc-HAc buffer solution, 2,4-dinitrophenol and 2,5-dinitrophenol exhibited sensitive and distinguishable voltammetric responses
at the glassy carbon electrode modified with poly-aspartic acid. By measuring the reduction peak currents of nitro groups
in different positions, dinitrophenol isomers have been determined simultaneously and quantitatively. The linear calibration
ranges were 1.1 × 10−6–6.0 × 10−4 mol l−1 for 2,4-dinitrophenol and 7.0 × 10−7–6.0 × 10−4 mol l−1 for 2,5-dinitrophenol, with detection limits of 2.7 × 10−7 and 1.1 × 10−7 mol l-1 respectively. This method has been applied to the detection of dinitrophenols in simulation water sample, and the
recovery was from 96.7 to 102.5%. |
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Keywords: | |
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