Determination of six sulfonylurea herbicides in environmental water samples by magnetic solid-phase extraction using multi-walled carbon nanotubes as adsorbents coupled with high-performance liquid chromatography

Abstract

a b s t r a c tMagnetic solid-phase extraction (MSPE) using magnetic multi-walled carbon nanotubes (mag-MWCNTs) as adsorbents, coupled with high-performance liquid chromatography-diode-array detector (HPLC-DAD), was developed for the simultaneous separation and determination of six types of sulfonylurea herbicides (SUs) in environmental water samples. Several variables affecting MSPE efficiency were systematically investigated, including the type and volume of desorption solvent, sample solution pH, salt concentration, amount of mag-MWCNTs, and extraction and desorption time. Response surface was employed to assist in the MSPE optimization. Under optimized conditions, excellent linearity was achieved in the range of 0.05-5.0 g/L for all six SUs, with coefficients of correlation r > 0.9994, and preconcentration factors ranging from 178 to 210. Limits of detection and quantification were 0.01-0.04 g/L and 0.03-0.13 g/L, respectively. The intra-day and inter-day precision (relative standard deviations, n = 6, %) at three spiked levels were 2.0-11.0% and 2.1-12.9% in terms of peak area, respectively. The method recoveries at three fortified concentrations were obtained within 76.7-106.9% for reservoir water samples and 78.2-105.4% for tap water samples. The developed MSPE-HPLC method demonstrated high sensitivity, repeatability, simplicity, rapidity, and excellent practical applicability.

Activated carbon/diatomite‐based magnetic nanocomposites for magnetic solid‐phase extraction of S‐phenylmercapturic acid from human urine

“…The selection of the type of adsorbent material plays a critical role for effective extraction in MSPE. A variety of solids, such as polymers (Wu et al, 2019), molecularly imprinted polymers (Wu et al, 2016), metal–organic framework (Chauhan et al, 2015), carbon nanomaterials (Ma et al, 2014; Ma et al, 2016) and silica (Huang & Hu, 2008), have been prepared and employed as appropriate adsorbents. Li et al (2015) prepared a graphene‐based magnetic nanocomposite and used the nanocompostie as an adsorbent for the MSPE of sulfonamides from milk samples.…”

Magnetic restricted access carbon nanotubes for smooth Cu and Zn extraction from Cu, Zn-superoxide dismutase

“…The association of Fe 3 O 4 magnetic nanoparticles with CNTs is a good example. After the modification, the magnetic CNTs (M-CNTs) acquires magnetic susceptibility enough to be used in magnetic dispersive SPE, wherein a magnet is used to remove the particles from samples/ solutions [7][8][9]. The main advantage of this procedure in comparison with the conventional SPE is the excellent interaction between the sorbent and sample, resulting in higher extraction recoveries.…”

Preparation of iron‐based MIL‐101 functionalized polydopamine@Fe3O4 magnetic composites for extracting sulfonylurea herbicides from environmental water and vegetable samples

“…Moreover, benefit from modified materials, Fe 3 O 4 composite materials have extraction properties that allow them to be used in adsorption studies. Fe 3 O 4 nanoparticles have been modified using ionic liquids, carbon materials, polypyrrole, polydopamine (PDA), and other species [4][5][6] for use in MSPE methods. Fe 3 O 4 nanoparticles coated with PDA have unique adhesiveness and superior biocompatibility.…”

“…The functional groups and unique adhesive properties of PDA-modified Fe 3 O 4 nanoparticles and the adsorption characteristics of MIL-101 led us to develop a simple one-pot solvothermal hydrofluoric acid free method for synthesizing MIL-101(Fe)@PDA@Fe 3 3 COONa, and concentrated HCl (37.5%) were acquired from Beijing Chemical Reagent (Beijing, China). 1,4-Terephthalic acid, 1,3,5trimesic acid, and Tris were purchased from Aladdin (Beijing, China).…”