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Using cobalt/chromium layered double hydroxide nano-sheets as a novel packed in-tube solid phase microextraction sorbent for facile extraction of acidic pesticides from water samples

Abstract

In this work, a “packed in-tube” configuration has been developed to packed in-tube solid phase microextraction followed by high performance liquid chromatography. Then, cobalt/chromium-layered double hydroxide (Co/Cr (NO3-)-LDH) nano-sheets were synthesized by simple coprecipitation method and were employed as a packed in-tube solid phase microextraction sorbent. The developed method and synthesized sorbent were applied for the extraction and pre-concentration of two different groups of acidic pesticides with different charges including an acidic herbicide (haloxyfop, anionic form) and insecticide (hexaflumuron, neutral form) from aqueous solutions. The extraction ability of developed method was investigated by X-ray diffraction (XRD), scanning electronic microscope (SEM), and fourier transform infrared spectroscopy. Characterization of the LDH powder using XRD and SEM images showed that it consists of a large number of inter-crossed and curved nano-sheets with plate-like morphology. Several important factors affecting the extraction efficiency such as pH of sample solution, extraction/desorption times, the flow rates of the sample solution and type of desorption solvent were optimized. Under optimized conditions, good intra- and inter-assay precisions (RSD%, n = 5) in the range of 3.3-3.9% and 4.2-4.9, respectively, were obtained. Also, the limits of detection were in the range of 0.05-0.08 μg L-1. This method showed good linearity for the pesticides in the range of 0.1-500 μg L-1 with coefficients of determination better than 0.9984 in water samples. The validated method was successfully applied for the analysis of haloxyfop and hexaflumuron in some water samples. Finally, it can be said that this method has the potential to be a general and reliable alternative for the analysis of acidic pesticide at anionic and neutral forms in real water matrices.

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Publication details

The article was received on 22 Jan 2018, accepted on 09 May 2018 and first published on 10 May 2018


Article type: Paper
DOI: 10.1039/C8NJ00372F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Using cobalt/chromium layered double hydroxide nano-sheets as a novel packed in-tube solid phase microextraction sorbent for facile extraction of acidic pesticides from water samples

    H. Asiabi, Y. Yamini and M. Shamsayei, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00372F

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