عنوان
pH assisted homogeneous liquid-liquid microextraction followed by electrochemical detection on MWCNTs modified electrode for the determination of 4-nitrobenzaldehyde in water samples
نویسنده (گان)
Kiani shahvandi,Siamak;Ahmar,Hamid
چکیده مقاله
The analysis of nitroaromatic compounds such as nitrobenzene, nitrobenzaldehyde and nitrophenols in natural waters and its effluents has a major reputation for environmental control due to their appearance from a wide range of activities [1]. Recently, so-called switchable hydrophilicity solvents (SHS) have been proposed as possible extraction solvents in liquid-liquid microextraction [2]. Ahmar et al. investigated the behavior of the SHS [3] for the determination of nitroaromatic compounds. In this work, a novel approach is presented to determine 4-nitrobenzaldehyde in water samples. The procedure is based on pH assisted homogeneous liquid-liquid microextraction using a solvent having switchable hydrophilicity and then determination by differential pulse voltammetry at the surface of multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrode.¬ The extraction technique is based on the use of a water-immiscible solvent (N,N-Dipropylamine) that can be miscible upon the changes of pH of aqueous sample solution. Afterwards, phases separation is induced by the addition of sodium hydroxide. 4-nitrobenzaldehyde as a model compound was extracted from water samples into the N,N-Dipropylamine. Subsequently, the electrochemical behavior of 4-nitrobenzaldehyde has been studied on the MWCNTs modified glassy carbon electrode. Experimental parameters were optimized using a one-factor-at-a-time strategy. Under optimized conditions, a linear range was obtained between 1.5 and 350 μgL-1 Also, limits of detection and quantification (at S/N=3) were 0.45 μgL-1 and 1.5 μgL-1, respectively. Finally, the performance of the proposed method was evaluated in river water as a real sample.

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