Extraction Of Diazinon Research Articles

Facile synthesis of Fe3O4@TMU‐12 (Co‐based magnetic MOF) for extraction of diazinon and chlorpyrifos from the environmental water samples

AbstractIn this study, magnetic metal‐organic framework composite (Fe3O4@ TMU‐12) was fabricated and used as an efficient sorbent for magnetic solid‐phase extraction of the diazinon and chlorpyrifos from environmental water samples. By simultaneous use of magnetic solid‐phase extraction and high‐performance liquid chromatography, a simple, quick, exact, and affordable method for the determination of diazinon and chlorpyrifos was achieved. The extraction conditions and efficiency of the magnetic framework composite for diazinon and chlorpyrifos were investigated. Under optimal conditions, the relative recoveries and preconcentration factors of the studied compounds were obtained in the range of 92.0%–99.3% and 201–210, respectively. The calibration curves were obtained in the range of 2–250 μg L−1 and 4–250 μg L−1 for diazinon and chlorpyrifos in water samples, respectively. The LODs were 0.5 and 0.8 μg L−1 for diazinon and chlorpyrifos, respectively (based on S/N = 3). The precision evaluated in terms of the relative standard deviations of intra‐ and inter‐day tests ranged from 3.4% to 3.8% and from 3.9% to 4.1%, respectively. The results show that the Fe3O4@TMU‐12 combine advantages of magnetic nanoparticles and metal‐organic frameworks, and are the promising sorbents in the magnetic solid‐phase extraction of diazinon and chlorpyrifos from environmental water samples.

Application of ecofriendly magnetic nanocomposite synthesized from natural materials for separation and determination of diazinon pesticide in real water samples

ABSTRACT In this study, a cheap, novel, ecofriendly and effective nanosorbent was synthesised with natural materials such as sand beach and eggshell for diazinon determination in natural water. The synthesised nanosorbent was successfully characterised using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), field emission scanning- electron microscopy (SEM), vibrating sample magnetometer (VSM) and Brunauer–Emmett–Teller (BET) methods. Effective parameters were optimised for the extraction of diazinon and determination was done by UV-Vis spectroscopy at 248 nm. The method was linear in the range of 50–400 µg L−1 and the limit of detection was 6.9 µg L−1. Adsorption kinetic and isotherm studies were performed. Also, for measurement of diazinon in water samples of Gilan province, sampling was performed from important points such as river water, Anzali lagoon, well water, agricultural streams, and tap water. The results shows good spiked recovery (97.6–103.4%) in all samples. The accuracy of the method was also confirmed by the student’s t -test with HPLC analysis of real samples.

Graphene oxide/polydopamine-polyacrylamide nanocomposite as a sorbent for dispersive micro-solid phase extraction of diazinon from environmental and food samples and its determination by HPLC-UV detection

ABSTRACT Graphene oxide/polydopamine-polyacrylamide nanocomposite as sorbent for dispersive micro-solid phase extraction of diazinon from environmental and food samples was synthesised and coupled with high-performance liquid chromatography-ultraviolet detector. The prepared sorbent was characterised by analytical techniques such as Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy–energy-dispersive spectroscopy and thermal gravimetric analysis. Main parameters affecting extraction efficiency of diazinon using dispersive micro-solid phase extraction such as sorbent amount, elution solvent and its volume, sorption and desorption times and pH of sample solution were investigated and optimised. The optimum values are as follow; sorbent amount, 0.2 g; elution solvent, methanol; elution solvent volume, 2.5 mL; sorption time, 10 min; desorption time, 4 min and pH of sample solution, 3. Under the optimised conditions, method detection limit and limit of quantitation values were 0.24 and 1.0 ng/mL, respectively. Relative recovery data for several real samples were obtained within the range of 82.0–98.0% with a relative standard deviation less than 6.5%. The proposed method was successfully applied to quantitative determination of diazinon in several environmental and food samples.

Monitoring of the Pesticide Diazinon in Soil, Stem and Surface Water of Rice Fields

Diazinon is an organophosphorus insecticide (OPP) that is used as a pesticide for Chilo suppressalis (WLK) (Lep., Pyralidae) in rice fields. The extraction of diazinon from soil and the stems of rice plants has been carried out by microwave-assisted extraction (MAE) and the results compared with ultrasonic extraction (USE). The best parameters for MAE are hexane-acetone (8:2 v/v) as a solvent, a 2.5 min extraction time, and 20 ml of the solvent volume. Also, surface-water samples of the rice fields were extracted by solid phase extraction (SPE) using a C18 disc. The optimum conditions of SPE were a sample volume of 750 ml, a pH of 7 and high ionic strength of water. The extracted samples were analyzed by gas chromatography-mass spectrometry (GC-MS). The relative standard deviation (RSD) and regression coefficients related to the linearity were <3.5% (n = 5) and 0.99, respectively. The limit of detection (LOD) is 0.1 ng ml(-1) with selected ion monitoring (SIM) at 137 m/z. The average recoveries of diazinon in soil and stem samples by MAE and surface-water by SPE were 98% (+/-3), 94% (+/-5) and 87% (+/-3), respectively. In June, the concentration of diazinon in soil and stem samples of the rice plants in Guilan province is high (55 ng ml(-1)) and in September is low (2 ng ml(-1)). In surface-water samples, the results are converse. In November, diazinon can not be detected in soil, stem or surface-water samples. Diazinon is degraded to diethylthiophosphoric acid. Also, three microorganism genera (Pseudomonas sp, Flavobacterium sp and Agrobacterium sp) have been found to degrade diazinon in soil and surface water.