Rapid analysis of pesticide residues in drinking water samples by dispersive solid‐phase extraction based on multiwalled carbon nanotubes and pulse glow discharge ion source ion mobility spectrometry

Abstract

An analytical method based on dispersive solid-phase extraction with a multiwalled carbon nanotubes sorbent coupled with positive pulse glow discharge ion mobility spectrometry was developed for analysis of 30 pesticide residues in drinking water samples. Reduced ion mobilities and the mass-mobility correlation of 30 pesticides were measured. The pesticides were divided into five groups to verify the separation capability of pulse glow discharge in mobility spectrometry. The extraction conditions such as desorption solvent, ionic strength, conditions of adsorption and desorption, the amounts of multiwalled carbon nanotubes, and solution pH were optimized. The enrichment factors of pesticides were 5.4- to 48.7-fold (theoretical enrichment factor was 50-fold). The detection limits of pesticides were 0.01∼0.77 μg/kg. The linear range was 0.005-0.2 mg/L for pesticide standard solutions, with determination coefficients from 0.9616 to 0.9999. The method was applied for the analysis of practical and spiked drinking water samples. All results were confirmed by high-performance liquid chromatography with tandem mass spectrometry. The proposed method was proven to be a commendably rapid screening qualitative and semiquantitative technique for the analysis of pesticide residues in drinking water samples on site.

Coupling of multi-walled carbon nanotubes/polydimethylsiloxane coated stir bar sorptive extraction with pulse glow discharge-ion mobility spectrometry for analysis of triazine herbicides in water and soil samples

“…Meanwhile, the problem that ions adhere to the ion source tube wall is solved, the ion loss is reduced, and the ion extraction rate is improved [39]. In this work, an appropriate new interface arranged on the introduction device was designed and constructed, helping us to have the direct introduction of SBSE fiber into the sample introduction mechanism.…”

Magnetic molecularly imprinted polymers for the detection of aminopyralid in milk using dispersive solid-phase extraction

“…17,18 Magnetic dispersive solid-phase extraction (MDSPE) based on separation with a magnetic sorbent and an external magnetic eld can eliminate the need for a centrifugation step, shorten the separation time for the target molecules from solution, and reduce the loss of liquid and solid during the separation. [19][20][21] In molecular imprinting-magnetic dispersive solid-phase extraction (MI-MDSPE), a MIP is synthesized on the surface of functionalized MNPs, which are then added to sample matrices containing target analytes for clean-up. Aer shaking the mixture, the MMIP that adsorbs the target substance is isolated from the solution using an external magnetic eld.…”

Preconcentration and Determination of Psychotropic Drugs in Urine Samples by Ion Mobility Spectrometry with Electrospray Ionization Coupling On-Line Single-Drop Liquid-Liquid-Liquid Microextraction

“…It is a gas-phase electrophoretic method in which ions are separated on the basis of their relative mobility. In the past two decades, it has been proven a reliable method for rapid and sensitive detection of trace substances, including residues and breakdown products of explosives [2, 3] and chemical warfare agents [4–6], as well as illicit drugs [7–9].…”